BM Pocket 4K 1080/50i

Hallo
I hope BM will add 1080/50i to the Pocket 4K. I have some Clients who need this and together with the UMP which is able to shoot interlaced it will be a nice b-cam.
I also think about using a MTF B4 Adapter to use broadcast lenses on the Pocket.

If using a B4 adapter you will need an 2x Extender on the lens.. Which will give you a zommed and soft image..

Unless BMD will make a HD crop mode in there like they did with the Ursa Mini Pro.

Are you sure ? Thought because of the MicroFourThird Sensor it will cover 2/3“ without extender?

You don’t need any 2x extender on the B4 lens to cover the HD window on the BMPCC4K. The HD window has a horizontal dimension of only 8.89mm. If you want to cover the 4K sensor, a 2x expander would be needed but that should work as the throat of the mount should allow it. In both cases you need the optics to correct the focus of the B4 optics to a single sensor.

All you need to do is attach the lens with the correct FFD. I don’t think the mFT mount is removable. The existing adapters for BMD cameras wouldn’t be the best choice though as they do a 1.1x image expansion.


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Hi Rick,

Do you think it would work with this adapter?

https://www.lensadaptor.com/b4-23-micro-43-adaptor

Yes, I don’t think it expands the image as far as I know. Best to check with MTF Services.

Since the dimensions of HD on the BMPCC4K are smaller than on the original BMPCC, it would be nice to have someone combine a slight focal reducer as part of the adapter. Then again it would be nicer if BMD offered a larger window such as 2K 16:9.

Of course you could use the adapter and record UHD. Of course the image will have a strong vignette. Then in post you simply define a 2K 16:9 window for your timeline to remove the vignette. Probably not a bad idea if you like 2K. Not sure but you might get 2.4K out of it.

Do you think BM will add 1080/50i ?

Just checked you could get a 2.6K 16:9 area in your timeline without an issue using a simple B4 optical adapter designed for the original BMPCC (I think)! That oversampling should give better quality when you need to deliver HD.

Maybe I should do that. I just can’t guarantee it will work because I don’t think there would be any shims involved. You would hope it’s close enough that the B4 back focus adjustment will suffice.

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Do you think BM will add 1080/50i ?

Don’t know about that. If the Panasonic GH5S does it...


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Thanks Rick , the GH5s does 1080/50i in AVCHD

Hallo
I hope BM will add 1080/50i to the Pocket 4K. I have some Clients who need this and together with the UMP which is able to shoot interlaced it will be a nice b-cam.
I also think about using a MTF B4 Adapter to use broadcast lenses on the Pocket.

Is there a reason not to use 1080p50? This can be used in a 1080i timeline without any problems. I do that all the time when delivering to Austrian television ORF.

@Rick
If you try an B4 adapter on the BMP4K , please let me know the results.

@Rick
If you try an B4 adapter on the BMP4K , please let me know the results.

Might make for some decent colour recording BRAW UHD (or ProRes 444?) and in post putting that vignetted footage on a Timeline 2688x1512 (40% oversampling) and delivering HD from the Timeline renders. All possible due to the much smaller 4.63 micron photosites in the BMPCC4K compared to the 6.5 micron in the original BMPCC. It’s a kludge but it should work. If you’re recording to a 1TB SSD, you may not mind the excess baggage in the clip.

Nothing wrong with using 1080p50 and interlacing on export if the client demands it.
All the information is there.

Hi Rick,
Do you think it would work with this adapter?
https://www.lensadaptor.com/b4-23-micro-43-adaptor

Yes it will physically mount a B4 lens to the camera, and using the HD crop you will get coverage. But to use full sensor, yiu will need the 2X extender, in UHD or downsampled HD, but you could still get some minor vignetting at wider focal lengths. But you are going to have a soft image duemto the CA caused by the ENG 2/3rds lens designed to work with a prism on s 3-CCD sensor csmera.

MFT Services warns MTF size sensor users:

ENG lens support must be used at all times. Only compatible with lenses with built in 2X extender engaged)

MTF also makes an optically corrected version, for MFT Cameras likemthe Pocket and AF100, prices is around £1500 to £2K. Abel Cine also makes a similar optically corrected B4 to MFT mount, at around the same price.
Cheers

Thanks I couldn’t tell if that image included the optics for a correction of the focus


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Not for $300, that is the non-corrected original adapter. They developed the optically corrected adapter after this one was released, about the time the Micro Studio Camera csme out.
Cheers

I do recall some very pricey adapters. Makes me appreciate the inexpensive B4 optical mounts that BMD offers.


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Yes, yes it does Rick.
Cheers