SIRUI Anamorphic Lens and BMPCC

I have a BMPCC sensor super 16 and do not know if the SIRUI Anamorphic Lens is compatible or are there any problems with this combination?
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The only problem you will face is the fact that it's a too long lens for anything useful that you would to shoot anamorphically for. 50mm at 1.33x on a 2.88x sensor, makes this lens a 108mm lens, which is frankly, useless. Unless you want to shoot birds anamorphically, there's not much sense buying that lens for the BMPCC. Even on a BMPCC 4k it becomes a 70mm, which is also not very useful for most narrative work either. They created a 50mm anamorphic lens because it's the easiest construction, not because it's useful. Consider that most of Tarantino's wide shots are equivalent to 21mm (full frame equiv).

Agree with Eugenia. For me until it gets down to 35-50mm (equivalent) the use cases are few.

Are you sure? As I understand it, unlike "standard" MFT lenses, the FOV of a 1.33x anamorphic lens on a MFT mount is closer to 25mm full frame equivalent. So, a very desirable combination for that spacious cinematic widescreen look.

Hi Marcel,

You shouldn't have any problems using the sirui Anamorphic lens. You are correct the FOV for the 50mm would have a Equivalent of 25mm. The only problem you'll run into is viewing the image properly. You would need a monitor to desqueeze the image for focusing. I am making a uploading a video about the different resolutions and frame rates for the pocket 4k when using a 1.33x Anamorphic lens tomorrow. Maybe it'll answer some questions for you.

Idk what the other person was talking about. Not to put anyone down but clearly they haven't used Anamorphic lens on a MFT sensor.


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The only problem you will face is the fact that it's a too long lens for anything useful that you would to shoot anamorphically for. 50mm at 1.33x on a 2.88x sensor, makes this lens a 108mm lens, which is frankly, useless. Unless you want to shoot birds anamorphically, there's not much sense buying that lens for the BMPCC. Even on a BMPCC 4k it becomes a 70mm, which is also not very useful for most narrative work either. They created a 50mm anamorphic lens because it's the easiest construction, not because it's useful. Consider that most of Tarantino's wide shots are equivalent to 21mm (full frame equiv).

Hi Eugenia, sadly you are mistaken. Anamorphic lenses widen the field of view on any camera, including the MFT system. Instead of multiplying the crop sensor, you divide for the field of view. So a 50mm would have a FOV of a 25mm on a MFT senors like the Gh5, bmpcc4k (slightly wider).

Here are a few videos I've made about it.

SLR MAGIC 2x ANAMORPHIC FOR MFT REVIEW // Gh5

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Gary, here’s the applicable math. The 1.33x anamorphic squeeze is design to use a sensor or window with a 16:9 aspect ratio. On the BMPCC4K, this UHD window has a ‘crop’ of 2.025x.

50mm x 2.025x / 1.33x = 76mm compared to 135 film gate.

When I shoot 1.33x anamorphic I’m using the SLR Magic APO 32mm. The Anamorphot gives me a 24mm horizontal AOV. Therefore with my BMPCC4K, using UHD, I have a FOV about 49mm on a 135 film gate, a little wider than a normal lens,

When I need to channel Tarantino, I use an 11mm focal length on the BMPCC4K open gate, without the 1.33x Anamorphot. 11mm x 1.9x = 21mm.

I don’t agree that the lens can’t be used but it’s going to find limited use for full or medium shots; may be fine for closeups.

Thanks Rick, I see what I've done wrong now.

There’s a lot to keep in one’s head. This Cinematography discussion group is probably wholly responsible for delaying my inevitable dementia with the ever-present need to exercise those grey cells before, during, and after every shoot or new purchase. And even then I manage to slip up quite often!

Too bad they don't have an EF mount for an S35 sensor. Also need a 16mm instead of a 50mm but that will jack up the price.

Too bad they don't have an EF mount for an S35 sensor. Also need a 16mm instead of a 50mm but that will jack up the price.

I've read from someone who contacted Sirui and they said that they are planning to support EF mount.

A lot of people are highly mistaken how usable this lens actually is.

I shot this entire music video on the Sirui 50MM with the BMPCC4K.

Yes, I agree. It's a fantastic lense!!! I use it at the BMPCC4k. Shot in 4K. Hopefully, SIRUI brings more lenses with different MM. Wideangle would be great...

I love anamorphic but don't like the crop on the BMPCC4K.

I love anamorphic but don't like the crop on the BMPCC4K.

Agree. They should have made a 20mm instead of a 50. Hopefully they'll learn and will deliver a 20mm (or even a 24mm) and a 35mm, and also have an EF mount models.

How about an anamorphic zoom that's 18-35mm on both MFT and EF mount?

I love anamorphic but don't like the crop on the BMPCC4K.

Agree. They should have made a 20mm instead of a 50. Hopefully they'll learn and will deliver a 20mm (or even a 24mm) and a 35mm, and also have an EF mount models.

How about an anamorphic zoom that's 18-35mm on both MFT and EF mount?

I think an EF lens on the BMPCC6K would make more sense given the 3.7K anamorphic mode there vs the 2.8K anamorphic on the BMPCC4K. It just looks a lot better to me, IMO.

I also think it's one of the reasons why this lens and other MFT anamorphic lenses like the Vazen look a lot better on the ZCam E2 vs the BMPCC4K.

I guess some shorther Sirui anamorphic lenses will be out soon... But why didn't they put gears on it? Is there anyone shooting anamorphic who would NOT want gears?

But why didn't they put gears on it? Is there anyone shooting anamorphic who would NOT want gears?

EXACTLY!

I guess some shorther Sirui anamorphic lenses will be out soon... But why didn't they put gears on it? Is there anyone shooting anamorphic who would NOT want gears?

Because RED has a patent on it...

Next patent for them will be the art of breathing oxygen…

Yes, I agree. It's a fantastic lense!!! I use it at the BMPCC4k. Shot in 4K. Hopefully, SIRUI brings more lenses with different MM. Wideangle would be great...

Have you tried this lens with a focal reducer? Thanks.

Yes, I agree. It's a fantastic lense!!! I use it at the BMPCC4k. Shot in 4K. Hopefully, SIRUI brings more lenses with different MM. Wideangle would be great...

Have you tried this lens with a focal reducer? Thanks.

How? This is a Micro 4/3 mount lens.

It's an MFT mount lens (or E-mount/X-mount) so a focal reducer isn't possible.

It's an MFT mount lens (or E-mount/X-mount) so a focal reducer isn't possible.

How? This is a Micro 4/3 mount lens.

Oops. Sorry. My mistake.

This could be a silly question but I'm wondering how the 1.33x image is squeezed into the BMPCC 4K sensor. If you shoot full sensor resolution 4096x2160 how is it 'filled up' with an anamporphic 1.33x lens? I mean, does the image fill 'all the space' and then you can unfold it to 1.33x4096 and 2160 in Davinci? That would be (black) 'magic', I guess.

to be honest, I don’t exactly know the math in this particular case. However, the use of the Sirui 50mm on the pocket 4k camera is good. You can record 4k DCI and de-squeeze display and HDMI with one button in the menu. In Resolve, the clips shot with this lens must be set to 1.33, and can be intercut easily with other material shot with spherical lenses.