Blackmagic Pocket Cinema Camera 4K!!!

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rick.lang

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Apr 29, 2018 11:59 pm

Jim Giberti wrote:
Denny Smith wrote:I’m not good at predicting these things so in reality it might have internal ND filtration too!


I seem to remember from the B&H Q&A that was posted that BM stated that there is some ND filtration and that you may want to add more.


Jim, that may have referred to infrared filtration on the sensor glass.


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Yue Shi Lai

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 3:27 am

rick.lang wrote:Watched a lot of videos from NAB 2018 that repeated the 5” monitor is the same as the “URSA Mini (4.6K)”. The web site describes it as super bright or some other meaningless phrase and BMD has defined the screen nits. If it’s truly the same as what I have on the URSA Mini 4.6K, that will be disappointing since my screen can be unusable in bright light although it will be perfect otherwise.

If that is the same screen, I measured it using a spectrophotometer: Its CIE Y luminance is 480 nt. It is even nowhere near the 700-1000 that modern smartphones can output. I have not seen anywhere similar specifications given by BMD, other than the 'Screen Dimensions 5" 1920 x 1080' and 'Screen Type LCD capacitive touchscreen'.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 9:10 am

Kim Janson wrote:I understood too that it takes stils, but due the resolution and I assume focus, I do not think it will be interesting still camera.

What gets me a bit lost is that BMD releases a camera with specs like Poket4k has at the price it has and people want more at lower price. Sure you can have that, in 5 years.


It's not too difficult, but I think people just expect more than is needed to do stills. 4k is ok.

Put it this way. Years ago Zcam released the world's smallest E1 M4/3rds mount 4kp30 camera people have been picking up for $199 (people have also picked up the bit bigger Yi m43rds camera for $299 with lens think). Both are maybe $10 off being able to record raw to disk uncompressed. Zcam did do a cinema camera for $599/$699 years ago, which seems to have got only to China briefly, but the c1r raw version didn't come out from what I can tell.

It's amazing how close zcam has been to success. The e1 hasn't got overhelming praise, but a few things different it would have been great. They too have full HD HDMI, preventing you from recording 4K uncompressed from it. The reports on how good the HDMI is, is worth reading.
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Jim Giberti

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 2:31 pm

Gene Kochanowsky wrote:Jim, that may have referred to infrared filtration on the sensor glass.


Duh. I hadn't had my coffee yet I guess. Or I'm so used to using IR/NDs that I can't differentiate any longer.

But that point about IR filtration is one that I did want bring up.
Would this be the first BM camera that has IR filtration?
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Tim Kraemer

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 5:00 pm

Has there been any talk of Micro cinema camera 4k? I sure would like one of those.
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Denny Smith

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 6:10 pm

Only from us wanting one, nothing from BM.
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rick.lang

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 7:43 pm

Jim Giberti wrote:
Gene Kochanowsky wrote:Jim, that may have referred to infrared filtration on the sensor glass.


Duh. I hadn't had my coffee yet I guess. Or I'm so used to using IR/NDs that I can't differentiate any longer.

But that point about IR filtration is one that I did want bring up.
Would this be the first BM camera that has IR filtration?


I believe they all have mild infrared attenuation in the sensor glass.


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rick.lang

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Apr 30, 2018 7:45 pm

Yue Shi Lai wrote:
rick.lang wrote:Watched a lot of videos from NAB 2018 that repeated the 5” monitor is the same as the “URSA Mini (4.6K)”. The web site describes it as super bright or some other meaningless phrase and BMD has defined the screen nits. If it’s truly the same as what I have on the URSA Mini 4.6K, that will be disappointing since my screen can be unusable in bright light although it will be perfect otherwise.

If that is the same screen, I measured it using a spectrophotometer: Its CIE Y luminance is 480 nt. It is even nowhere near the 700-1000 that modern smartphones can output. I have not seen anywhere similar specifications given by BMD, other than the 'Screen Dimensions 5" 1920 x 1080' and 'Screen Type LCD capacitive touchscreen'.


Super bright? Not even close, unless this new camera isn’t quite identical to the URSA Mini monitors. Here’s hoping that BMD announced the NITs when it ships.


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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostTue May 01, 2018 12:38 am

rick.lang wrote:
Jim Giberti wrote:
Gene Kochanowsky wrote:Jim, that may have referred to infrared filtration on the sensor glass.


Duh. I hadn't had my coffee yet I guess. Or I'm so used to using IR/NDs that I can't differentiate any longer.

But that point about IR filtration is one that I did want bring up.
Would this be the first BM camera that has IR filtration?


I believe they all have mild infrared attenuation in the sensor glass.


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Rick, you are correct. It's a common misconception that our cameras don't have IR filtration. If that is indeed the case, you'll be capturing IR images.
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Wayne Steven

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostTue May 01, 2018 7:44 am

What is mild attenuation then, some infrared image? What sort of filter performance curve and IR filtering curve did the original pocket have Kristian? Thanks.
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Yue Shi Lai

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostWed May 02, 2018 9:33 am

Wayne Steven wrote:What is mild attenuation then, some infrared image? What sort of filter performance curve and IR filtering curve did the original pocket have Kristian? Thanks.

The transmittance at 700 nm is about 3.8-4.7% (OD 1.3-1.4, or 4.4-4.7 stops). You can compare this to various stills cameras being measured here: https://kolarivision.com/articles/inter ... nsmission/ , which are usually < 1% at 700 nm (and some of the exceptions shown there, like Nikon D100, are actually well-known for IR pollution). Another way to compare: The human 2° L cone response at 700 nm is about 0.6%, so the camera is roughly 7x (or 2.8 stops) more sensitive than your eye.

This was measured indirectly, comparing camera response against the 630-730 nm quantum efficiency in Fairchild's data sheet. If BMD has direct measurement (with me reluctant to disassemble the filter just for this purpose), and can share it with us, that would be very appreciated.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostWed May 02, 2018 2:29 pm

Thanks Yue. So, this is for the original pocket? It's very acceptable. I thought they might be implying less than 50% IR removal. I wonder if it produces the mild pastel I see, or is it still the colour filter.
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Preben Randhol

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostWed May 02, 2018 8:20 pm

Pavel Lavrov wrote:Im still trying to figure out why there was such a rush to push Pocket 4K out so early in development. All we got right now is a lot of tech specs on a paper and no footage to back it up. Yes BD has preproduction models, but they won’t start shipping for another year. It would be perfect to announce and ship it next NAB show...

Really hoping they’re not cutting corners and get good product out, as promised.


It is good advertisement. Creating interest and chatter in forums :-)
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Preben Randhol

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostWed May 02, 2018 8:25 pm

rick.lang wrote:Watched a lot of videos from NAB 2018 that repeated the 5” monitor is the same as the “URSA Mini (4.6K)”.


What is the orientation of the polarization on the URSA mini screen? I hope it is not like the BMPCC which have perpendicular polarization to sunglasses, meaning the screen goes black if you are wearing sunglasses in the sun.
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Yue Shi Lai

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostWed May 02, 2018 9:40 pm

Wayne Steven wrote:Thanks Yue. So, this is for the original pocket? It's very acceptable. I thought they might be implying less than 50% IR removal. I wonder if it produces the mild pastel I see, or is it still the colour filter.

This was measured on the Micro Cinema Camera, not the original Pocket.
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Wayne Steven

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu May 03, 2018 12:04 am

Thanks anyway. Do they have identical sort of picture characteristics? If so, the filters and pixel response are likely the same.
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Yue Shi Lai

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu May 03, 2018 10:23 am

Wayne Steven wrote:Thanks anyway. Do they have identical sort of picture characteristics? If so, the filters and pixel response are likely the same.

The Pocket and Micro appears to be the same, except for moiré.

But the bigger caveat is, the need for IR filtering depends on the sensor itself, and the 4K Sony sensor will have a different susceptibility to IR. Since the spectral sensitivity of a CMOS varies with the depth of junctions under the surface, the Sony manufacturing for back-side illuminated sensor is unlikely to result similar junctions as the front-side illuminated Fairchild sensor, from the original Pocket and Micro.
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Clarence Williams

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat May 12, 2018 5:52 pm

Are there any Blackmagic pocket cinema camera 4k test available?
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun May 13, 2018 11:52 am

Nope.
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rick.lang

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Blackmagic Pocket Cinema Camera 4K!!!

PostSun May 13, 2018 5:21 pm

No tests with any rigor but a couple of images in from a NAB 2018 review. Maybe worth waiting for better test samples that likely will appear just before the camera ships hopefully in September. Of course if you wait for sample clips, you’ll wait a lot longer for the camera.

If you have plans for the camera in a September or October shoot, your best strategy is a preorder from a small shop. But check their return policy. A small shop might not be as willing to accept a return as the very large retailers.

In the past, BMD has tried to ship a small number of cameras to as many retailers as possible, rather than ship a lot of cameras to the largest retailers and shut out the small shops for months. And remember that the flow is first to the five world regions distributors who then allocate cameras to the retailers in their region. The scenario I described applies to North America, but may not apply to all other regions or to all retailers.

It’s just a bit like winning the lottery. You play because it’s fun to play and you might actually get a camera before Christmas.


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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat May 19, 2018 9:48 am

As I understand the size of the matrix in pixels for 4k mode will be 4096 x 2160 in proportion to the physical size of 18.96 mm x 10 mm.

I wonder what physical size will be for the FHD mode 1920 x 1080?

According to rumors it will be ~ 8.88 mm x 5 mm. But I want to clarify.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat May 26, 2018 5:40 am

8.8875mm x 5mm


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Savannah Miller

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu May 31, 2018 5:52 am

I'm totally hoping that they release demo footage just in time for Cinegear. I'm pretty sure John has already shot something, so this would be a nice move if they can show something. Not sure it will happen though.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu May 31, 2018 5:58 am

Yes, but John B can make any camera look good!
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu May 31, 2018 11:32 pm

Savannah Miller wrote:I'm totally hoping that they release demo footage just in time for Cinegear. I'm pretty sure John has already shot something, so this would be a nice move if they can show something. Not sure it will happen though.


The appearance of offically released footage would be a big milestone. An indication that the camera is actually close to done.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Jun 01, 2018 5:41 am

The camera is already "done" enough to shoot with, it's just that some things may not be finalized. They just need footage and then inspect it thoroughly enough that random people on the internet don't tear it apart and find flaws.

The 4.6K demo footage was older gen2 color science and it did improve upon release but that didn't stop the demo film from looking very nice.
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Gene Kochanowsky

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Jun 01, 2018 11:03 am

The camera was "done" almost two months ago. I've seen BM fiddle with a "done" camera for a good part of a year. The 4.6k turret will be almost "done" till the stars go cold. In BM double talk, "done" means nothing until BM thinks it's "done" enough to release official footage.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Jun 02, 2018 1:31 pm

rick.lang wrote:No tests with any rigor but a couple of images in from a NAB 2018 review. Maybe worth waiting for better test samples that likely will appear just before the camera ships hopefully in September. Of course if you wait for sample clips, you’ll wait a lot longer for the camera.


So there are pictures taken with the camera on the internet?
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Savannah Miller

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Jun 02, 2018 7:58 pm

How do you know the 4.6K turret is almost done? Yes there is a working 4.6K URSA camera, but does a 4.6K sensor stuck inside an URSA body mean that the turret is finished?

I think the turret will never be finished because it's too expensive and there's not enough URSA cameras to justify the cost.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Jun 02, 2018 8:12 pm

Savannah, we are discussing the new Pocket Camers 4K, and the development time from almost done (two months ago at NAB), to release and possible early footage samples, based on the release of the UM4.6 history. This has nothing to do with the Ursa 4.6 turret.
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Gene Kochanowsky

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Jun 02, 2018 9:39 pm

For a while BM observed the discipline of announcing a product only when it was shipping. Given their poor track record of accurate delivery announcements, it was the only thing they could do to recover some semblance of credibilty given their previous history on multiple cameras. And if they wish to sell to professional cinematographers, it wouldn't hurt to have somewhat predictable product availability.

On of the things prized in BM cameras is their image quality. They work hard to get it right, and it's usually a good sign that they think they are very close when they release footage. It can't really be a "done" camera till they've done that. Previously "done" cameras have been held up for many months past their original ship dates while BM got it right.

Please don't get me wrong, I wouldn't want BM to change a thing except one. Don't announce till it's shipping.

Everything is peaches and cream until they start continuously slipping their ship dates. Then the pain starts for those professionals who believed BM.

Manging expectations is a big part of product development, and if you are not very good at calling your shots you shouldn't announce the shot till it's in the hole.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Jun 02, 2018 10:34 pm

Very true Gene, once we see some sample footage, we know it’s close. While BM missed some shipping dates trying to add non-starter features, namely GS on the UM 4.6 and Micro Cinema Camera, recent deadlines, including then Micro Studio were shipped on time, as was the first small shipment of the original Pocket camera. So I am willing to give BM the benefit, that they will ship the new Pocket 4K on time.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Jun 03, 2018 3:52 am

Apple is an interesting example of announcing new hardware and the announcement usually includes the future shipping date if it is not “shipping today.” The only recent exception is the ‘new’ Mac Pro that didn’t ship until the sands of time were running out of the December hourglass in 2013. And the ‘newer’ Mac Pro was hinted last year but “not shipping in 2018.” The phones are that the other extreme where you can pretty much set your watch by a tightly managed timeline that has only slipped a few weeks once as I recall.

My point is if you don’t ship until it’s available then your announcements and shipping dates must be quite predictable by the consumer. So the sage consumer can plan when they will add new cameras with some confidence. If the “now shipping” products are delivered helter-skelter over the years then inevitably you have the complaint “damn I just bought the URSA Mini 4.6K last month and it’s now dead with the unexpected release of the new URSA Micro 6K!

BMD would need to pick the show for announcing and delivering cameras and preferably use a different date for cameras versus the plethora of other gear they sell. Putting nearly all new announcements into NAB must be life-threatening for their staff with so much announced on the same day every year.

Apple announces fewer products and delivers fewer products but splits it up into two or three seasonal periods depending on the type of gear. Lesson learned?

I’m okay with whatever path they follow, but what has occurred in past years cannot be an ideal business model. We have had some of the explanations why something was delayed for many months and it’s often related to third-parties and believing what they were told by those vendors or assuming the vendors were trustworthy. The sensor glass issues, the magenta corners/clouds, the unusable global shutter to allow user selectable shutters, and others.

They often chase very bleeding-edge technology supplied by others and of course we all have blood on our hands as a result. The BMPCC4K should be a different story and delays if any may just be seasoning their secret sauce to which we are addicted. It had better not have anything to do with their cutting edge carbon fibre polycarbonate bodies dissolving in sunshine or rain!
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Jun 03, 2018 4:57 am

I remember waiting the Micro Cinema camera for ever and the always shifting delivery dates, I hope the lesson was learned from that.

Anyway... with the pocket they could be well on time, as I remembered they promised to deliver it September.

About Apple that company has gone very strange. No updates to Mac Pro 2013, next version that will make it trash coming up maybe 2019. Typing this on 2018 MacBook Pro that I do not like much...
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Jun 03, 2018 1:20 pm

Bring on some footage, so I can compare it to that stuff from NAB. I'm more worried about the Sony highlight cut off and the colour performance curves of the sensor/filter. I may have not likeed what I saw at NAB, but it doesn't mean that is just then, and everything is normally better and will more grade like a 4.6k.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Jun 03, 2018 7:26 pm

There can many reasons footage isn’t released or a camera might not be shipped.

This happened to the very first BMD camera when another company that have to sign off on an implementation for a certain codec take their sweet time. You can’t release footage until it’s licensed (even from another codec) And if they drag their feet in doing so you have a very very solid reason for not releasing footage.

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Jun 04, 2018 1:49 am

Interesting point. Hopefully the codec sign off has some well documented procedural limitations so the firm signing off can’t withhold approval beyond reasonable expectations, if that proves to be a major contributing factor to a delay beyond September.


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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Jun 04, 2018 12:15 pm

No wonder people are not happy about licensing a certain codec. Really makes me hesitant about doing a camera with it, even though it should be a no brainer. It means also, I would likely not be allowed to put in a custom 14 or 16 bit mode.
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Clarence Williams

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Aug 31, 2018 6:08 pm

I saw a few tests with this camera, pretty impressive! I'm still waiting to upgrade from my 2.5 cinema camera. I was hoping to get a 35mm sensor, I did not like the Ursa line at all. I wonder if they have something else coming down the pike!? Also, any advice on adapters for EF mount with this camera?
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Aug 31, 2018 6:15 pm

Clarence, the new full size MFT sensor p, 10.5x18.96mm) is just about the same size as the Cine Std. 35mm Academy open gate. I think the new PC4K is just as much an upgrade for the BMCC and it is for the Pocket camera, combining design bits from both, with a larger sensor than either of them, putting the biggest 4K sensor they could stuff in a MFT mount format camera. If the MFT group, had kept the larger diameter of the original Four Thirds Mount, yiu could get a full Academy, or even a smaller S35 size sensor in it. But they chose to reduce the Mount diameter to help reduce the size, and complicate, the MFT lens design.
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Gene Kochanowsky

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Sep 01, 2018 7:05 pm

It's a great relief that sample footage has finally been released. BM still isn't out of the woods yet, but it's looking better.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSat Sep 01, 2018 9:13 pm

Gene Kochanowsky wrote:It's a great relief that sample footage has finally been released. BM still isn't out of the woods yet, but it's looking better.



Actually, they did a really good DR test in the woods. ;)
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostMon Sep 03, 2018 11:39 pm

It'd be lovely to see a test with Leica R Lenses!
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Nov 04, 2018 6:59 pm

'Unfortunately, one or more of the items in your order is not in stock'

Oh darn, my Pre-order is now a Backorder on Adorama. If this is anything like my Production Camera 4K Pre-Order, I'll have my camera about this time next year lol :lol:
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostSun Nov 04, 2018 7:59 pm

Yeah, usually not a good idea to order a pre-order item as if it were in stock.
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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu Nov 08, 2018 11:08 pm

With that said, I couldn't take the pre-order wait anymore, and when B&H sent me an email that mine would ship out approximately mid-January, I broke down, cancelled my pre-order, put $500 on top of the refund amount and purchased one of the new ones on eBay. It stings a bit, but I have a trip to Kauai coming up in mid-December and many smaller trips before then, so I figured that it'd be worth it.

Received it a few days ago, but have been so busy with other work that I have had almost zero time to actually shoot...just figuring out the menu system, looking for another lens to add to my first MFT lens (the Panasonic 14-120mmm F3.5-5.6 O.I.S.) which I ordered along with it (looking for an inexpensive but good macro lens, of which there are a couple, namely the Olympus 30mm and also the Panasonic 45mm), and dealing with storage to record to (I picked the G-DRIVE 1TB over the Samsung T5) and how to power the PCC4K. Just found my LP-E6 dummy battery in my Canon 5D mkIII case, which I had almost forgotten about (the dummy battery, not the 5D), and was overjoyed to find that when connected to my Anchor 20,000mAh set to output at 9V, it powers the camera properly. The same couldn't be said for a dual-USB dummy battery I had ordered on Amazon. The PCC4K would power on and immediately off again. That's why I was so relieved to find my existing dummy battery to do just fine. The Anchor is a great power-bank that has served me really well for 5+ years already...I have taken it *everywhere* and use it constantly, so it's bound to power the PCC4K for about as long as 8-10 of the LP-E6's.

But, being ever the perfectionist with all things technology, I was wondering whether anyone knew of a cable that goes from a classic 9V barrel connector to the 2 pin power connector of the PCC4K? I found this one here, which may not have the right barrel size (which could be adapted fairly easily/inexpensively), but at $89 it's a bit on the pricey side, me thinks:

(link removed, bc I'm not yet allowed to use any, but it's called "NEBTEK ARRI2 TO BLACKMAGIC POWER CABLE")

At a little bit less, $59, there is this one:

(link removed, bc I'm not yet allowed to use any, but it's called "Redrock Micro Blackmagic Cinema Camera to PowerPack Cable")

But anyone know of a solution that's less than that? There are a number of 9V capable power-banks out there for less than the professional (and usually rather heavy) battery packs are, and with the right cable, they would make for a very nice power solution for the PCC4K.

Oh boy, so much to figure out...but as always, I wanna get the "accessorising" figured out as well, to create the most comfortable and efficient (meaning good price/performance) shooting setup for this amazing little camera...so excited to get my work taken care of and really get going with experimenting!
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tillkrueger

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostThu Nov 08, 2018 11:44 pm

to answer my own question, there already appears to be a lively discussion going on about the 2 pin cable at forum.blackmagicdesign.com/viewtopic.php?f=2&t=80084

here's to learning all about it...
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rick.lang

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Nov 09, 2018 3:04 am

A barrel connector to 2-pin is one of the three cables bundled by BMD for $55. But don’t know if that’s really shipping yet.


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Rick Lang
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tillkrueger

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Nov 09, 2018 3:40 am

Thanks Rick. Is there any info on that package available online? If it’s 3 cables at $55, and eachone increases the usefulness of all things PCC4K, then that’s a fair price, me thinks. Curious what the other two cables will be. Do you know?
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Justin Jackson

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Re: Blackmagic Pocket Cinema Camera 4K!!!

PostFri Nov 09, 2018 6:58 am

Can you list the power pack you use? I was thinking of getting the CORE PowerEdge battery to mount under/to the side of cage/camera to power it. I am not sure how long that would last. I know my current v-mount 98WH CORE powers my Sony AX53 camera and Atomos Ninja Inferna while recording for about 3 to 4 hours. I assume the BM4K uses similar power to the Atomos, which alone should run for a good 5 or so hours on the one 98WH battery I think. I would love to have a smaller battery pack that I can velcro/grip mount to the camera cage and use a hirose 2-pin to power the camera with. I dont have mine yet so not sure what the actual input needs are though.
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