October 10, 2016 at 11:14PM

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Focal reducer on BMPCC

Hi there,
I'm gonna buy the Blackmagic Pocket Cinema Camera with Samyang Cine Lens with M43 mount (not sure yet among 24mm T/1.4 or 16mm T/2.2).

I know M43 lenses don't need a focal reducer/adaptor, but watching some video on vimeo I noticed that someone put a focal reducer on these kind fo lens and I don't understand if this is necessary for a better quality.
Or maybe Samyang Cine Lens with Nikon mount have a better quality rather than M43?
Anyone can answer to my doubt?
Thank you guys.

4 Comments

You will not have better quality necessarily. But it will reduce your focal length and makes your image wider. It also makes your image brighter because more light hits the sensor. This is useful if you have a bad low light camera.
If you want to use FF lenses with a camera that has a crop of x2.88 you should consider using a speedbooster (same as a focal reducer).

October 11, 2016 at 7:51AM

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Eric Halbherr
Director, DP, Editor, Creative Storyteller
1585

I highly recommend ordering lenses in a mount that will work with a Metabones focal reducer. One of the most adaptable mounts is the Canon, but any compatible mount with the glass you've already own is a worthwhile investment. A Metabones adapter will allow you to maximize the potential of BMPCC.

October 11, 2016 at 10:07AM, Edited October 11, 10:11AM

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Marc B
Shooter & Editor
822

Hi Sara, The problem with any MFT camera is sensor size...so unless you use a dedicated MTF glass for your camera you will end up with a cropped image(about 2.8 times if you are using glass intended for full frame sensor such as the Samyang lens you are mentioning in your question..) this will turn your lens into a telephoto lens a 24mm lens will look like a 70mm lens in your BMPCC so getting a wide angle establishing shot is almost imposible. The dedicated Metabones Speedbooster adaptor for BMPCC works great by reducing the focal length of your lens thus reducing the crop factor to almost 2 times instead of 2.8 times so an 16mm full frame lens will look around 35mm on your camera. The added benefit to this speedbooster is more light coming into the lens so it makes your lens faster from 1.4 to 1.0 about, so it dramatically improves the BMPCC performance in low light situations...The down side to this adaptor it's its price (close to or slightly under u$d 500) but if you are serious about the visual quality of your content this focal reducer it is a must. If you do choose to go this way you will need also a ND filter plus an IR cut filter as in sunny weather there is too much light coming to your sensor..A great lens for this camera is the Sigma ART 18-35mm zoom wich keeps the same aperture at all times. To end my answer, the adaptor comes in both mounts Canon to MFT and Nikon to MFT.. I hope this info was helpful, and best luck in your project. Claudio

October 12, 2016 at 9:51PM

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Claudio Rosas Portal
Film Director/Producer
93

I wish you'd consider using the BMCC with a speedbooster.

October 14, 2016 at 5:57AM

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"Speed Booster" is the name of metabones' focal reducer.

Unlike said above, you are indeed supposed to get a bump in quality, think of it as the opposite of a telephoto converter, since it focuses the light on a smaller area, you increase the sharpness, and aberations like color fringing becomes less noticeable.

Also, it would make your lenses feel like closer to an APS-C/S35, which is a big standard in modern film making, I would definitely get one, + a regular adapter to reach closer to your subject/talent.

On a side note, adapters tends to add flares.

Maui

October 14, 2016 at 6:06PM

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