URSA Mini 4.6k The Original™ Magenta Cast Issue

Sorry Andreas but who are you to decide who is a professional and who is not?
It sounds pretty arrogant what you said.
Now I would love to meet those amateur users that spend 5000$ for a camera that they'll not want to test.

Wait, you think a non-professional user is going to spend 8,000.00 (USD, if you get the full package plus cards and batteries)????? When they can have a 4K, high speed camera for 400.00 with an iPhone? I just think that's wrong, sorry. Maybe wedding videographers, but wedding videographers and others test cameras too! I'm just puzzled by some of your remarks.

Wait, you think a non-professional user is going to spend 8,000.00 (USD, if you get the full package plus cards and batteries)????? When they can have a 4K, high speed camera for 400.00 with an iPhone? I just think that's wrong, sorry. Maybe wedding videographers, but wedding videographers and others test cameras too! I'm just puzzled by some of your remarks.

In India, unlike many countries, Canon, Sony and Red are available for testing, but not BMD. So we rely on this forum. By we, I mean a few professionals like us. So all comments are welcome

the target customers for the ursa mini are not professional users. Most of them will not test a new camera, before using it...we absolutely dont know, how many units are fine and how many are bad out there...

Last I checked - the Flat I rent, Car I drive, great life I live, was paid for, by the money I make off doing stuff with Motion Pictures & Images.
Anyone - making money off one's profession is per definition a Professional. Which implies NOT that one is skilled (I know A LOT of pros which aren't) it merely implies that one makes a living off of it...

I know quite a few who have opted and waited for the UM46 - they are ALL professionals.
So per definition, in my case and the ones I know of, UM46 has been purchased by 100% Professionals.
So - it is definitely a Camera which Professionals are considering a worthy 'helper' to put that bread on the table.

As a matter of fact, I know 2 guys who own a Red Scarlett. They are great at what they do but ALL amateurs. Which does not infer one's skill

Sorry Andreas but who are you to decide who is a professional and who is not?
It sounds pretty arrogant what you said.
Now I would love to meet those amateur users that spend 5000$ for a camera that they'll not want to test.

.. I am sorry..With "professional" I mean people who make a living with video. I didnt mean they are "better" than others...but maybe you are right...there is probably no difference..so just forget the post above I was wrong and apologize...

I'd like to quote myself from page 3 of this thread:

Does the magenta cast appear also when shooting without lens? Maybe there is a problem with the protection glass in front of the sensor? Just a shot into the blue: sensor heat dissipation changes a little bit the adhesive film between sensor and glass, where there is more heat in the middle and less in the corners...

When reading that it seems I was not so wrong:

"Probably a little but the problem is in the hardware itself. The magenta cast its the sensor coating protecting the sensor before they build the camera. This coating is projected to dissipate in the course of the build time (from the sensor factory to the assembly on BM HQ) the problem here was the sensor manufactor fail on the level of this coating and hundreds of sensors where shiped with this problem."

Wait, you think a non-professional user is going to spend 8,000.00 (USD, if you get the full package plus cards and batteries)????? When they can have a 4K, high speed camera for 400.00 with an iPhone? I just think that's wrong, sorry. Maybe wedding videographers, but wedding videographers and others test cameras too! I'm just puzzled by some of your remarks.

In India, unlike many countries, Canon, Sony and Red are available for testing, but not BMD. So we rely on this forum. By we, I mean a few professionals like us. So all comments are welcome

You missed the point of my comment.

Wait, you think a non-professional user is going to spend 8,000.00 (USD, if you get the full package plus cards and batteries)????? When they can have a 4K, high speed camera for 400.00 with an iPhone? I just think that's wrong, sorry. Maybe wedding videographers, but wedding videographers and others test cameras too! I'm just puzzled by some of your remarks.

...my comment was not thought through enough...I deleted it.

Jamie, let me know what they tell you, because to me they said the camera was good. I've sent new tests proving the magenta corner and the camera sometimes gives unusable images, i also asked for an RMA and no answer. Some people seem to get an RMA while others aren't getting any answer.

I'm processing the RMA through my reseller, not BMD directly. I'll let you know what happens.

Jamie, do you see this also live/playback on the camera monitor as well?

Yes, I ran SDI out to a calibrated Flanders Scientific reference monitor and the image and scopes were the same as in Resolve.

Is this a IR light related problem or more like white balance problem? For me the other one looks magenta, the other one green, either one looks natural

It's not an IR issue. I'm quite familiar with IR pollution and this isn't it. The screengrabs are jpegs and only meant for basic comparison. That's why I included the RGB waveforms that clearly show that one has balanced tint and temperature and in the other the tint is skewed quite far toward magenta. I assure you there is no green tint on the image from Pocket Camera.

Also would be interesting to see how they look if colour corrected.

The point here is to get a properly balanced image directly out of the camera while on set. It's possible to do so with my Pocket and 2.5K Cinema Camera, but impossible with the Ursa Mini 4.6K I received.

Jamie, that's not the magenta corners issue. You got a good cam. Thats an overall magenta cast. You can set the tint in the new OS and remove it. The problem cameras have magenta corners even after you white balance the center of the frame! So you got a good one!

I have to disagree. A good camera should be able to capture a balanced image IN CAMERA and send a balanced image out over SDI.

I did test it in raw 4:1 and the results were the same. To balance the image I had drop the tint setting in the raw tab of Resolve below -40. That's just insane. None of the raw images that BMD and JB posted for download require such extreme corrections. In fact, they require no change of tint at all. In Resolve in the raw tab the default temperature and tint setting is "as shot" and with JB's images they come out perfectly balanced using the "as shot" setting. And even though grayed out, you can read that the tint settings don't stray beyond 12.
With the 4.6K I was sent, if I use the "as shot" setting in the raw tab, the images are tinted magenta. I have to manually drag it out beyond -40 for each and every shot to get close to balance.

The tint setting in the raw tab is there to dial out a bias in lighting (green in fluorescent office lighting, for example) or make minor tweaks. It's completely wrong to have to dial out a dramatic tint bias inherent in the camera sensor itself.

EDIT: Also, I had my hands on the new firmware at NAB which does have a tint setting in camera. However, the 4.6K units Blackmagic had out were perfectly balanced with the tint setting at the default of 0. No tint adjustment was needed to get a balanced image on the internal monitor or external SDI connected monitor.

When reading that it seems I was not so wrong:

"Probably a little but the problem is in the hardware itself. The magenta cast its the sensor coating protecting the sensor before they build the camera. This coating is projected to dissipate in the course of the build time (from the sensor factory to the assembly on BM HQ) the problem here was the sensor manufactor fail on the level of this coating and hundreds of sensors where shiped with this problem."

Hey Robert,

that is based on the comment from that italian guy on vimeo, isn't it? For me that was one opinion from that guy and not even proofed? Or did i missed something in all the rumors?

Thank You
Joe

I got one of the very first 4.6k EF cameras to be released and it had pretty strong magenta across the top and right. I exchanged it and got the replacement yesterday. It is noticeably better.

On the first body I could find magenta on almost any shot, with nearly any lens.

With the new body, I did some test shooting outdoors with as many settings and lenses as I could, and found no problem with magenta. However, in the studio shooting a white wall, the magenta is very noticeable, and the green in the center seems stronger. This was easiest to find with any 35mm lens, especially stopped down (I tested three different lenses; the result was identical). At other focal lengths, it is dramatically better than the first body we had.

On a final note, for this first time I got some shots that really took my breath away. This camera can really sing. I was feeling so disappointed about the issues, but my hope is reviving.

I went through 2 cameras waiting on the third. I'm not sure when enough is enough and should I just ask for a refund.

Matt, if convenient, please shoot something in a ProRes HD window (not downscaled from full sensor) or the raw 2K window. Is whatever problem you are seeing now showing up in HD with the 35mm lens? With a 50mm lens?

I ask as I'll be restricted to shooting with those frame sizes on the Fujinon for a few weeks until SLR Magic resumes shipping the 50mm APO. I might think all is well but I may be deluded since I'm only using small windows. If you still see some difficulties with the new camera at those resolutions, then I'll have a reference when judging my camera's sensor susceptibility to magenta.

I won't be able to judge the corners and likely not able to assess the 'cast' issue from the 'uneven colour' issues until I have the 50mm APO PL lens.


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Hello,
First time poster here, found this thread through a Google search. Has anyone here that returned their camera received a good camera back? I have gone through several cameras now and am wondering if it is futile to continue at the moment. Maybe I'm just unlucky.

Hi Rick,

I just did a quick test with several lenses at 35mm and 50mm:

in 2K Raw window, there is no magenta in the corners.

in ProRes 2k full sensor, there IS magenta; this is at 35mm f22 on a Contax Zeiss lens:

prores2k.jpg (184.37 KiB) Viewed 7672 times

I'll be shipping mine for RMA tomorrow.. Now I know there's no hope for a good one turning back

The lens really makes a difference.

The popular Sigma 18-35mm looks much worse. 35mm at f16:

Screen Shot 2016-04-26 at 5.13.51 PM.jpg (113.52 KiB) Viewed 7657 times

The lens really makes a difference.

The popular Sigma 18-35mm looks much worse. 35mm at f16:

Screen Shot 2016-04-26 at 5.13.51 PM.jpg

I shot a bunch over the weekend to test in real world scenarios again. I still haven't determined exactly when/where this problem will happen. I have DNGs shot with the same camera, settings and lens; and it will happen one instance and not be noticeable the next. The shots are different, so that leads me to believe it does have to do with the angle of light hitting something within the body of the camera.

Honestly there are so many issues coming up with this camera, that getting a good camera is like winning the lottery.

Let's see:
From magenta corners (like mine)
magenta cast (like mine - i don't really mind this, easy to fix)
faulty xlr inputs
noisy internal mic (like mine - don't really mind this either)
dust under sensor cover
faulty touchscreens
not working with some ef lenses (with latest firmware - only after reboot, like mine).
flickr on EVF

Am i forgetting something?

I'm giving up hope.

BM just emailed me saying that they have no response from the development team and that in the mean time i can have my camera returned to their office for testing.

I've send them all the dng's they've asked for, its clear that the camera has issues, now they want to use the camera i pre-ordered 9 months ago and paid for myself for tests?

Isn't it simple, just test a good camera out, and replace mine. BM, we all know that you read this. And it's always a good idea to be a good listener, but at some point, a good listener needs to say something, or you're just a wall. Oh, by the way, i won't accept any new camera that has been tested for all of those issues above and work as advertized.

BTW: When it works, it's stunning.

I have to admit, even if I end up with a great camera in the end, this experience of testing my camera like crazy and worrying about it being fixed, instead of excitedly shooting with it (like when I first got my BMCC) has soured the entire experience. And this happens after a long delay. When I asked BMD about the magenta corners issue, after a few days of silence, after attempting to help by sending them DNGs they requested, I got this response back today:

"We do not have any updates at this time, although we are attentive to the issue."

Soooooo... This could take anywhere from 2 days to 2 years to figure out and I'll have a faulty camera until that happens (with no communication unless I initiate it)? I still own both a BMCC and a pocket and have been a supporter of BMDs cameras from literally day 1 (I placed an order for a BMCC when they announced at NAB '12). I've been an advocate for them amongst my peers and a defender when some around me have turned up their nose, but I don't see how I can defend this. I don't see how I can recommend anyone go and buy this camera after my last couple of weeks with it. In fact, I'd have to warn them. If the best thing I can say about a product is that it's great "if you get a good one", well... You probably wouldn't spend upwards of $7-8k* on it, would you? You wouldn't hire one out for a job, would you?

I've been extremely, almost super-humanly patient throughout this process, but that response really bothered me.

"We do not have any updates at this time, although we are attentive to the issue."

The worst thing? The camera, when it's right, is downright revolutionary. Magical. 85% of an Alexa. Maybe more. The new firmware is effing AMAZING. It's everything I've wanted from a camera and I want it to be my platform for the foreseeable future.

They really need to say something of substance now, even if it's a direct communication to those affected and in limbo.


*Camera body+media+EVF+shoulder kit+batteries, etc etc. Adds up fast...

Guys, the magenta is one thing, but there has been something else that has really bothered me that I thought was maybe just me. That is, skin tones don't just look magenta, they look airbrushed. I've noticed it with my own footage and thought maybe I was doing something wrong. But I've started noticing it everywhere. Here is a still from a demo of the Ursa Mini 4.6K and the Ursa Mini in a low light setting. Look at the weird loss of detail under the same conditions with the UM 46! It looks so bad! Am I the only one who has felt like people look airbrushed or like mid tones are clipping?

I super sad but after looking at footage from the RED Raven camp and UM 46 I feel like Im seriously regretting my decision to stick with BMD and it makes me feel sick to my stomach...



You can watch the guy's original video here:

Guys, the magenta is one thing, but there has been something else that has really bothered me that I thought was maybe just me. That is, skin tones don't just look magenta, they look airbrushed. I've noticed it with my own footage and thought maybe I was doing something wrong. But I've started noticing it everywhere. Here is a still from a demo of the Ursa Mini 4.6K and the Ursa Mini in a low light setting. Look at the weird loss of detail under the same conditions with the UM 46! It looks so bad! Am I the only one who has felt like people look airbrushed or like mid tones are clipping?

I super sad but after looking at footage from the RED Raven camp and UM 46 I feel like Im seriously regretting my decision to stick with BMD and it makes me feel sick to my stomach...



You can watch the guy's original video here:

Quality of light is important. Look at the thread "some um46 stills", shot in 2k windowed raw, they look stunning.

I watched that guys review video. It was terrible. He was literally reading the menu off the camera and not understanding half of what was there. Look at how it was lit man.

Guys, the magenta is one thing, but there has been something else that has really bothered me that I thought was maybe just me. That is, skin tones don't just look magenta, they look airbrushed. I've noticed it with my own footage and thought maybe I was doing something wrong. But I've started noticing it everywhere. Here is a still from a demo of the Ursa Mini 4.6K and the Ursa Mini in a low light setting. Look at the weird loss of detail under the same conditions with the UM 46! It looks so bad! Am I the only one who has felt like people look airbrushed or like mid tones are clipping?

I super sad but after looking at footage from the RED Raven camp and UM 46 I feel like Im seriously regretting my decision to stick with BMD and it makes me feel sick to my stomach...



You can watch the guy's original video here:

Quality of light is important. Look at the thread "some um46 stills", shot in 2k windowed raw, they look stunning.

I watched that guys review video. It was terrible. He was literally reading the menu off the camera and not understanding half of what was there. Look at how it was lit man.

Oh I agree, the point of the video was to show its performance in a poorly lit environment. Thats the name of the video basically. However. I still see more detail in the video on the right. Lots more. Why? And I'm not saying people aren't getting really nice images out of the camera, just saying Im seeing more people having difficulty and dealing with deal breaking (for me) "quirks". But I will hop over to that thread to see what you are looking at

Just wondering, has anyone tested magenta corner issue in 4K windowed mode with UM46?

Is it there? Or it disappears because of the crop?

Was just thinking, UM46 is still a lot of value if I use it in 4K mode. I agree, we have already sacrificed global shutter, now 4.6K will become 4K. But without the purple corner blobs, the colour science of this camera is just beautiful.

I think that shooting in 4K windowed would avoid the magenta corners. I'm planning on shooting 2.4:1 and I think that the 4608x1920 window also will likely avoid the magenta corners. 4608x1920 and 4096x2160 represent the same total pixels but the aspect ratio is significantly different.


Sent from my iPad using Tapatalk

Rick,

I believe you've got your camera. Can you do some test for fence sitters like us?

Subrata

I don't have magenta corners on my 4.6k, but all the sensors (I believe) have a little normal, non-hue related vignetting. In 4k window mode, there is virtually, no vignetting. Even when using the full sensor, I am not noticing the slight vignetting in real life. I, however, mostly shoot the full sensor and output either 4096x1714 or 2048x858 or 1920x803 (2:39.1 aspect ratio). I like the wriggle room. Frankly, unless you are shooting a feature with a 4k distribution or Vimeo/YouTube , I don't know why one would deliver anything larger than a 2k 2:39.1. Heck, most festivals want 1920x803 or 16:9. If I had a camera with magenta corners, uneven hue across the sensor plane, or any weirdness other than slight vignetting in the corners, I would call BMD and get an RMA. There is a lot hysteria out there over this magenta issues, but there are way more great cameras in the field.

Just to make things a little worse. BM just emailed me again:
As noted by my colleague and the development team previously, after white balancing the images using the tint and temperature controls within Resolve, we are unable to see any uneven cast.

Are they kidding me? i'm i supposed to do what, shoot white walls with no lens for the rest of my life and have fun with tint slider in resolve?

They aren't even acknowledging my camera has issues.

This is after i've sent them a dng that looks like this (note: increased saturation to make it more noticeable).

Fix this in resolve with just tint.

Just to make things a little worse. BM just emailed me this again:
As noted by my colleague and the development team previously, after white balancing the images using the tint and temperature controls within Resolve, we are unable to see any uneven cast.

Are they kidding me? i'm i supposed to do what, shot white walls with no lens for the rest of my life and have fun with tint slider in resolve?

They aren't even acknowledging my camera has issues. I'm not going to send them the camera so that they can send me a new one with the same or even more problems like others have received.

This is after i've sent them a dng that looks like this (note: increased saturation to make it more noticeable).

Drive over it, set it on fire and then post the YouTube video which generate enough money to buy something useful....

No magenta on my 4.6k in windowed or full frame, lens or no lens on a white paper. Very happy


Glenn Hanns
DOP
Sydney, OZ

Just to make things a little worse. BM just emailed me again:
As noted by my colleague and the development team previously, after white balancing the images using the tint and temperature controls within Resolve, we are unable to see any uneven cast.

Are they kidding me? i'm i supposed to do what, shoot white walls with no lens for the rest of my life and have fun with tint slider in resolve?

They aren't even acknowledging my camera has issues.

This is after i've sent them a dng that looks like this (note: increased saturation to make it more noticeable).

Fix this in resolve with just tint.

Such an answer is probably worse than the issue itself...I feel very sad for BMD. They create a very bad company image this way..

Oh man, just return this stupid camera and get a Sony FS7.

Just to make things a little worse. BM just emailed me again:
As noted by my colleague and the development team previously, after white balancing the images using the tint and temperature controls within Resolve, we are unable to see any uneven cast.

Are they kidding me? i'm i supposed to do what, shoot white walls with no lens for the rest of my life and have fun with tint slider in resolve?

They aren't even acknowledging my camera has issues.

This is after i've sent them a dng that looks like this (note: increased saturation to make it more noticeable).

Fix this in resolve with just tint.

Wow.. just wow! Outrageous!!! Out of all the examples I've seen, yours really does take first prize (I've seen your previous posts too).

For BM to say there's no problem with this image is an huge p*ss take, and I hope someone from BM is reading this and takes very prompt action. What a joke!

Okay, so I just did the white wall test and there's definitely no magenta or vignetting on my Scarlet-W.

Oops, sorry posted in the wrong forum...

Nuno,
I really understand your feelings.

Looks like the same happened to me.
I have been told that my DNG of white wall no lens show magenta uniform across all the frame.
They asked me to send my camera for test with their reference model, to see if "the image quality is within expected quality".

My UM46 will leave this afternoon, if the same come back (or another one with the same issue) I'll understand that I'm not skilled enough to work with professional cameras, and I'll go back recording with my iPhone 3G.

222_1.1.1.jpg (314.3 KiB) Viewed 7202 times

RAW Film to VIDEO V3

balanced

222_1.1.1.jpg (330.91 KiB) Viewed 7187 times

WB balanced

The lens really makes a difference.

The popular Sigma 18-35mm looks much worse. 35mm at f16:

Screen Shot 2016-04-26 at 5.13.51 PM.jpg

Should name this Backlight bleeding

Nuno,
I really understand your feelings.

Looks like the same happened to me.
I have been told that my DNG of white wall no lens show magenta uniform across all the frame.
They asked me to send my camera for test with their reference model, to see if "the image quality is within expected quality".

My UM46 will leave this afternoon, if the same come back (or another one with the same issue) I'll understand that I'm not skilled enough to work with professional cameras, and I'll go back recording with my iPhone 3G.

222_1.1.1.jpg

RAW Film to VIDEO V3


did you us any IR filter. The greens and brush in the foreground appear to be a bit IR contaminated.

222_1.1.1.jpg

WB balanced

Got my second Ursa 4.6 and it's magenta again .... Damn.
Here just a quick test.
ISO: 200
Aperture: F12


Shot with the Sigma 18-35mm. One with 18 and the other one with 35mm. What do you think? Send it back again and hope the 3rd one will be ok? I mean, what when the 3rd one is as bad as this again?

Nuno,
I really understand your feelings.

Looks like the same happened to me.
I have been told that my DNG of white wall no lens show magenta uniform across all the frame.
They asked me to send my camera for test with their reference model, to see if "the image quality is within expected quality".

My UM46 will leave this afternoon, if the same come back (or another one with the same issue) I'll understand that I'm not skilled enough to work with professional cameras, and I'll go back recording with my iPhone 3G.

222_1.1.1.jpg

RAW Film to VIDEO V3

222_1.1.1.jpg

WB balanced

...this is catch 22...their "Reference model" has probably a color cast too...so everything looks "fine"...

Why aren't you using the film to rec 709 lut vs 3


Sent from my iPhone using Tapatalk

Got my second Ursa 4.6 and it's magenta again .... Damn.
Here just a quick test.
ISO: 200
Aperture: F12


Shot with the Sigma 18-35mm. One with 18 and the other one with 35mm. What do you think? Send it back again and hope the 3rd one will be ok? I mean, what when the 3rd one is as bad as this again?

That image is just plain horrible. No camera, I don't care how cheap or expensive, should ever produce an image like that...

As a matter fact, it looks like a carefully created post-effect to simulate some aliens landing. Any camera producing an image like that from the cam. is either broke or poorly thought through.

Got my second Ursa 4.6 and it's magenta again .... Damn.
Here just a quick test.
ISO: 200
Aperture: F12


Shot with the Sigma 18-35mm. One with 18 and the other one with 35mm. What do you think? Send it back again and hope the 3rd one will be ok? I mean, what when the 3rd one is as bad as this again?

That image is just plain horrible. No camera, I don't care how cheap or expensive, should ever produce an image like that...

As a matter fact, it looks like a carefully created post-effect to simulate some aliens landing. Any camera producing an image like that from the cam. is either broke or poorly thought through.

Totally agree. I wouldn't use even an iPhone as a camera if it did that. That one is even worse than mine (unless Kevin is really pumping the saturation).

Rick,

I believe you've got your camera. Can you do some test for fence sitters like us?

Subrata

Subrata, the only lens I have received is the Fujinon B4 so my first tests will be ProRes HD windowed and raw 2K windowed. I expect my 50mm APO to arrive in May and then I'll be testing all combinations of codec and frame resolutions using the 50mm lens.

Sorry I can't be more helpful. Today is the day I must do my Canadian taxes so I decided no other distractions!

There is a lot hysteria out there over this magenta issues, but there are way more great cameras in the field.

I actually don't know how we can quantify that. This is the kind of thing that doesn't always show up and some folks aren't noticing it. I commented on a video on youtube (I think it was slashcam), and they said in the description that they tested their camera and it was fine. I looked at the video and there it was, plain as day (to me). I hope this is a small problem, but again, how do we know for sure how wide-spread it is?

And BM ist still shipping faulty cameras...its a shame

Got my second Ursa 4.6 and it's magenta again .... Damn.
Here just a quick test.
ISO: 200
Aperture: F12


Shot with the Sigma 18-35mm. One with 18 and the other one with 35mm. What do you think? Send it back again and hope the 3rd one will be ok? I mean, what when the 3rd one is as bad as this again?

That image is just plain horrible. No camera, I don't care how cheap or expensive, should ever produce an image like that...

As a matter fact, it looks like a carefully created post-effect to simulate some aliens landing. Any camera producing an image like that from the cam. is either broke or poorly thought through.

Totally agree. I wouldn't use even an iPhone as a camera if it did that. That one is even worse than mine (unless Kevin is really pumping the saturation).

I set wb in the middle with photoshop and pumped the saturation to 100 so the magenta is more visible. But nonetheless that shouldn't happening at all.

Not exactly new info, but I just got this back from BMD in response to me asking them how I can get a working camera now:

Based on the correspondence & communication regarding your inquire the summary/guidance is as follows:
* Inquire regarding Magenta over the image: Resolve can adjust for color bias.
* Magenta over corners/edges: We have gathered information for our engineers, they will provide us with guidance and determination. We unfortunately do not have an ETA that we can provide.
* Understandably, if you are not happy with the camera, returning the camera to your reseller before the return window closes is an option.

Hey guys, as mentioned earlier I have gone through two cameras so far, both had the magenta issue and one of them had dust inside the sensor case. Anyways I've been waiting roughly two weeks for a replacement. I called my dealer today and was told that it could be another couple of weeks they have had so many exchanges that new cameras were going strictly to people who returned and individuals who preordered weren't receiving cameras so now they are trying to split them up. So now I have to decide should I just get my money back, or keep trying for a good one? Also as shocking as their response is, I kind of understand it, if they are truly having this many returns from all of their retailers they simply can't afford to recall the camera. My advice check your camera, and deal with your dealer.

I don't have magenta corners on my 4.6k, but all the sensors (I believe) have a little normal, non-hue related vignetting. In 4k window mode, there is virtually, no vignetting. Even when using the full sensor, I am not noticing the slight vignetting in real life. I, however, mostly shoot the full sensor and output either 4096x1714 or 2048x858 or 1920x803 (2:39.1 aspect ratio). I like the wriggle room. Frankly, unless you are shooting a feature with a 4k distribution or Vimeo/YouTube , I don't know why one would deliver anything larger than a 2k 2:39.1. Heck, most festivals want 1920x803 or 16:9. If I had a camera with magenta corners, uneven hue across the sensor plane, or any weirdness other than slight vignetting in the corners, I would call BMD and get an RMA. There is a lot hysteria out there over this magenta issues, but there are way more great cameras in the field.

Scott, you camera seems normal, that's great news. Like you, I deliver mostly in 2K 2.39. But it's not the moot question. We shoot in 6K Dragon too and when we shoot we shoot 6K. Otherwise, we could have just stuck to 2K camaras. A UM with BMCC sensor would have been great. If I am delivering mostly in 2K 2.39, a 5D Mark III is nearly there. But would I shoot in windowd 2K mode in UM46? Definitely no!

I had my question because of several reasons. It seems UM4K has a good sensor. Or, the sensor that I have in my BM4K which I use quite a lot. If the UM46 is a problem, settling with UM4K would make a lot more sense (also save me some money). I wanted to know the behaviour of UM46 in windowed 4K mode as the camera seems to have a better colour science and it can go up to 1600 iso.

If I settle or UM46, I have two options. If I am lucky, I'll land up with a good camera like yours. Previously, I was not lucky with my BM4K, so I may not be lucky this time around too. If I am unlucky, then I am in a soup.

In India, RMAs are not easy as BMD doesn't have a presence here. They have distributors. They'll refer me to Singapore in case I land up with a problem. This is not an easy situation.

Hey guys, as mentioned earlier I have gone through two cameras so far, both had the magenta issue and one of them had dust inside the sensor case. Anyways I've been waiting roughly two weeks for a replacement. I called my dealer today and was told that it could be another couple of weeks they have had so many exchanges that new cameras were going strictly to people who returned and individuals who preordered weren't receiving cameras so now they are trying to split them up. So now I have to decide should I just get my money back, or keep trying for a good one? Also as shocking as their response is, I kind of understand it, if they are truly having this many returns from all of their retailers they simply can't afford to recall the camera. My advice check your camera, and deal with your dealer.

...My advice would be: Return the camera (keeping the preorder), wait until July and get a new camera then. I am sure at that time, the sensors will be fine. BM is probably working very hard, to get the issue fixed (they know, that the UM does have an issue) To ship "clean" cameras is the only way to stop all these RMAs...