Blackmagic Forum

Will Nikkor or Leica-R glass vignette on the 4K?

Is it safe to go with the EF mount (4k) and use adapters?

Any lens meant for 35mm film should cover the sensor. But the EF mount is not as easy to use with converters due to the flange focal distance. It's kinda an odd/unfortunate choice of mount for the 4K version. I think a Nikon mount would have been better, then we could use a lot of adapters easily.

- EDIT - brain lapse, nikon mount wouldn't have been any better (except for using nikon glass) -

I used a Leica-R 50mm with a ISCORAMA on top
attached to a canon 5Dmk2 via an adapter = Vignetting!

What's going to stop the BM 4k vignetting?

bartman wrote:I used a Leica-R 50mm with a ISCORAMA on top
attached to a canon 5Dmk2 via an adapter = Vignetting!

What's going to stop the BM 4k vignetting?

How much of the frame Vignettes?

Don't forget this is a Super 35mm frame on the BMPC (Super 16 on the BMPCC and non-standard on the BMCC) so if there's slight vignetting on the 5D which is full frame then there may not be any on the BMPC.

If you have the lens and an EF adapter then possibly find a 7D, EF Scarlet or EF Epic set to 4k. Any of these should give a good idea of the lenses optical characteristics on the BMPC.

Jason Hinkle wrote:Any lens meant for 35mm film should cover the sensor. But the EF mount is not as easy to use with converters due to the flange focal distance. It's kinda an odd/unfortunate choice of mount for the 4K version. I think a Nikon mount would have been better, then we could use a lot of adapters easily.

I believe a PL mount will follow (being aware of 2nd mount time issues on the BMCC), between the PL and the EF you get most of the cine lenses designed to cover super 35mm.

So the Canon 5D has a larger sensor than the k4?

bartman wrote:So the Canon 5D has a larger sensor than the k4?

Slightly bigger yes.

ok thanks.

distance to sensor seems so far on the EF

bartman wrote:I used a Leica-R 50mm with a ISCORAMA on top
attached to a canon 5Dmk2 via an adapter = Vignetting!

What's going to stop the BM 4k vignetting?

The BMPC4K sensor is slightly smaller than an APS-C sensor so something might vignette on a full-frame sensor but work with the BMPC4K. The 'crop factor' on the BMPC4K is 1.70x compared to the 2.277 crop of the BMCC and the approximately 3 crop of the BMPC pocket camera.

Rick Lang
Sent from my iPad using Tapatalk HD

Many thanks!

Pete Proniewicz-Brooks wrote:

bartman wrote:So the Canon 5D has a larger sensor than the k4?

Slightly bigger yes.

5D: roughly 36 x 24mm
BMPC: 21.12mm x 11.88mm

Not just "slightly" really. The BMPC sensor isn't even real "Super 35" size, so it doesn't come close to Full-Frame 35mm... More like APS-C.

Full Frame 35mm photography format and S35 film format are two different things.

People have had Leica-R success on their 5d's, but obviously had problems with the wider lenses and mounting. But on a s35, there should be no vignetting at all. Mounting/Flange distance will be the biggest problem.

I'm a Leica-R fanboy nut, so I feel the same for your concern. But please refer to this chart:

http://www.pebbleplace.com/Personal/Leica_db.html

Jason Hinkle wrote:But the EF mount is not as easy to use with converters due to the flange focal distance. It's kinda an odd/unfortunate choice of mount for the 4K version.

Not really. You can convert many lenses to work on the EF mount. Sure not as many as on a MFT but you still have a lot you can work with. I'm running Nikon, Olympus OM, Classic Russian M42, Zeiss Contax Yashica and others on the original EF mount BMCC. There are even a few PL zooms that fit.

Jason Hinkle wrote:I think a Nikon mount would have been better, then we could use a lot of adapters easily.

Nope. A nikon mount would have been a worse idea. Canon EF flange focal distance is 44mm. Any lens with ±45mm FFD and longer can be mounted on the EF mount. So that means:
Pentax K
M42
Contax C/Y
Olympus OM
Nikon F
Leica R
some PL
some OCT-19

Nikon is 46.5mm. Meaning less lenses can be adapted to the mount.

innerspark wrote:I'm a Leica-R fanboy nut, so I feel the same for your concern. But please refer to this chart:

http://www.pebbleplace.com/Personal/Leica_db.html

Many of those lenses makes as No, Iffy or Maybe would probably work fine on the BMCC and BMPC as there is no mirror that needs to clear the rear element of the lens.