byuri734

Great. Any application of this for sound recording as well? My understanding is that sound does not work with lossless compressed, right? Perhaps with higher speeds one can record uncompressed with sound.

I don't think they've been able to work out how to get higher resolutions than 720 vertical pixels to work properly when using the full aps-c sensor, due to the way the EOS M is designed, although they were trying find a way around that and they started having some success... but the video files so far resulted in a lot of corrupt frames. Here's the discussion about it: https://www.magiclantern.fm/forum/index.php?topic=16608.0  
Perhaps MLVFS might be able to convert the files and read AWB properly? I believe it should now be able to work with lossless mlv files, however I don't know where to get the latest version of the program! With MLV App on Windows I can convert the MLVs to cdng without any issues (with the option to export uncompressed or lossless). Maybe try a previous build of the program to see if it works?

I agree, if you are looking at S16, it is better to go with a BMPCC. You probably can get a used one for just a bit more than an eventually new eos-m speed booster.

I agree, if you are looking at S16, it is better to go with a BMPCC. You probably can get a used one for just a bit more than an eventually new eos-m speed booster.

3x + the 1.6x crop of the sensor. If you want s16 and RAW, just get the Blackmagic Pocket or Micro. It reliably shoots Full HD in RAW as well as ProRes, with a s16 sensor.

What happened to Bohus?  Thanks for the link.
 
 
I am fairly sure that there is a 3x crop mode in Magic Lantern, but I don't know what resolutions are possible, nor if one can shoot in that mode and not suffer pink/green focus pixels.  It is difficult to determine Magic Lantern capabilities as the only mention of features is sometimes spread over many threads on their forum, with some threads having 60+ pages of posts.
 
 
Well, if Metabones doesn't make a speed booster that mounts on the EOSM, some of their competitors already got the EOSM covered.  Plus, if an EOSM-m4/3 gets made, that would allow the use of a lot of m4/3 focal reducers on the EOSM, including Metabones.
 
Metabones should actually make their $peedboosters with interchangeable camera mounts, so you only have to spend $500+ for one set of optics.

I posted a comment on one of their youtube videos where they demonstrate the adapter: https://www.youtube.com/watch?v=GPseT8Ok3EA&lc=
 
I think the only way to get close to a 3x crop (which is approx Super 16 size) is to increase the horizontal resolution to 2.5k (using 5x zoom mode). However at that resolution you only get about 3 seconds record time, and the vertical res is limited to 1080. 
The resolution I like to use with movie crop mode (1800x1024) gives you 4.66x crop which is a bit larger than super 8. It's closer to 1/1.7", same as the Pentax Q-S1 sensor.
I actually emailed the metabones sales team last week about their plans to make a speed booster for the EOS M mount (since it would be useful for the Canon M50 too), and they say they plan to do it but can't provide further info at this stage. If they do make it, that would be one way of getting super 16mm field of view on the EOS M!
Nice to hear MLV App reads the white balance properly for you. Did you change any settings in the program? On the PC version it always defaults to 6000k.
With exposure I have the zebras set to LumaFast, over 99% which I think is the default - apart from that I judge exposure by eye. As long as I'm not blowing out highlights with this zebra setting, the image seems fine. In the Destination Docklands video I posted above, you can see instances of blown out highlights with harsh clipping where I shoot directly at the sun or backlit clouds (visible on the cover image). I could see the zebras in liveview when shooting that shot but it was impossible to avoid. 

That's weird, it seems to work for me. Even when the magic lantern overlay is on liveview, I just press the Q Set physical button and from there I tap on the screen to choose different colour balance presets, which include AWB. I always leave my camera on AWB since it works very well.
Very true. I've also checked with Fotodiox as they already make a Sony E-mount to M4/3 adapter, as do various other manufacturers. The Sony mount is very similar to the EOS M mount with the same flange focal distance so should be easy to produce an adadpter for EOS M to m4/3, even if it lacks electronic contacts. Fotodiox said they'd talk to the design team and see if they can make such an adapter.  

Yes that's an issue with the MLV App. I hadn't noticed till recently. I export to cdng so it can be corrected in Resolve, but would still be nice to get the right colour temperature from the start. Hope they can find a way to fix this.
Here's another video I shot for my music with the EOS M whilst travelling to BVE expo: 12 bit lossless raw, crop mode at 1800x1024, using the EF-M 15-45mm and a Pentax 6mm f1.2 c-mount lens which vignettes slightly:
 
 
 
 

Crop mode on the eos m has a area which is slightly larger than super 8mm, it's somewhere between 1/2" and 1/1.7" sensor size, depending on which resolution and aspect ratio you pick, so super 16 lenses would be fine on the eos m. For example, 1800x1024 resolution on eos m is a 4.66x crop from full frame, whilst super 16 is approx 3x crop.
One of my no-brand adapters seems like your Fotodiox one, where the 6-66mm ends up exactly upside down. With this particular adapter I've been able to get closest to parfocal performance, so it's probably the best option for this lens.
I made a video to test parfocal performance and vignetting in 16:9 and 4:3 aspect ratios, using this adapter. Movie crop mode records slightly off centre horizontally, so if you want 4:3 aspect ratio and are getting vignetting - you have to recentre the image in post... which I've done below in the 4:3 shots: 
 

There is a PL mount to EOS M adapter, but it's from MTF so it's expensive: https://www.srb-photographic.co.uk/pl-mount-to-canon-eos-m-mtf-camera-adaptor-9290-p.asp  I don't know if there are cheaper alternatives. 
Funnily enough I was talking to the MTF guys at BVE expo yesterday asking them if they had an EOS M to M4/3 adapter! It would be great to use Micro 4/3 lenses or a BMPCC speed booster on the EOS M. Unfortunately no such adapter exists. 
For my Pentax 6mm f1.2 prime c-mount tv lens, I've just cut out a piece of paper and am using that as a shim (making the lens screw in less), which makes it slightly more usable. Without that, infinity focus and the lens distance markings are completely off with all my adapters. 
Thanks so much for testing this - good to know and may consider this lens in future if I have money! I don't imagine it would cover a 16:9 crop frame on the EOS M (which is approx 1800x1024) since that's a fair amount more than super 8 size, but if you're able to check at some point that would be useful.
 

Thank you very much, folks! Probably the M mount version of the Schneider is more precise too but those leicinas sell for a great prize. It is great to hear that the Angenieux has a good cover though. I will try to get one soon.
I will try to get a new adapter as well. I am also thinking about trying some brushes between the lens and the adapter to see if I get the lens to screw less.

I got my adapter from China, so it took a while to arrive, but seems to be out of stock now: https://www.miniinthebox.com/black-c-mount-cine-movie-lens-to-canon-eos-m-camera-lens-adapter-ring-cctv-lens_p927184.html
The one they ended up sending me looks slightly different to the one in the photo. When I screw on the Schneider 6-66mm onto it, it aligns correctly - the internal horizontal plastic parts covering the top and bottom of the glass align horizontally, thus minimising the vignetting. I have another c-mount adapter where these internal plastic parts end up at an angle or near vertical when the lens is screwed in fully, causing a lot of vignetting. I'd recommend buying a couple of different adapters on ebay and hopefully one will work - all these adapters seem to vary so much! 
In any case I haven't been able to get completely parfocal performance on the Schneider zoom, the focus does seem to drift slightly at the wider end at open aperture as you mention - your theory about the flange distance being non-standard would definitely explain things. It would be nice to be able to do a back focus adjustment on this lens to fix that!

I don't think you need the experimental build to activate higher resolutions on EOS M, all you need to do is select the movie crop mode or use the 5x zoom mode and in theory you can select any resolution you like up to the 2.5k limit (or 1800x1030 limit in movie crop mode)- that applies to any build of magic lantern on EOS M. However the limitation on the standard build is that you're stuck with 14 bit uncompressed raw - and the data rate is so high that you can't go much further than 1280x720 if you want continuous recording on the standard build. For higher resolutions you need the experimental builds.
The 10/12 bit experimental build still allows you to use the regular mlv_rec and sound modules I think, so you can record sound and shoot 10 bit uncompressed raw for example. That should be sufficient for you if you're aiming for 1408x1030. However if you want to get longer record times with higher resolutions, you'll need the "4K raw video recording; lossless compression" experimental build, and that only works with mlv_lite module - i.e. no sound. 
The experimental builds are here: https://builds.magiclantern.fm/experiments.html

I can confirm that the "Beaulieu Optivaron 6-66mm f1.8" vignettes as @Alpicat showed. Does anyone have a Angenieux   8-64mm 1.9 to test in crop mode to see if it also vignettes at 4:3 (1408x1030)? I would like to buy one, but before that it would be good to know if it would cover this resolution. Perhaps @cantsin or someone else?
According to Pro 8mm the 6-66mm will vignette with a Super 8 camera with the Max 8 modification (which is basically an enlarged gate). However, they say the Angenieux 8-64mm will not vignette on this Max 8 mod. Then, it seems the Angenieux should have a larger image circle.
https://www.pro8mm.com/products/schneider-lens?variant=30610041601
https://www.pro8mm.com/products/angenieux-lens?variant=30609178561
I can confirm that Schneider CCTV 12.5-75mm 1.8 covers the crop mode fine. It is a relatively small light for a zoom, but of course the fun is in having a real Super 8 covering as much the sensor as possible.  

In the magic lantern menu, I'm using the "real-time preview" option under the Raw video options (selectable under the Preview options). This gives me the correct framing (including correct aspect ratio) in live view if I press the "info" button on the camera a couple times until the magic lantern overlay appears. Also Global draw has to be enabled - ensure that's switched on in the magic lantern menu.
I'm doing this with the Movie crop mode enabled (i.e. the "600D style movie-crop mode"). If you try this with another crop mode, you won't get the correct framing.

Can one record 4:3 in "movie crop mode", something like 1370x1024... this would create a 4:3 image (like Super 8) and would help reduce file sizes and give you more time of 12-bit lossless? When you say recording time is drastically reduced with a "brightly lit scene," how many seconds you are taking about. Is it around 15 seconds at least? It could be interesting if so. Super 8 has a cartridge of around 3 minutes, I would rarely record more than 15 seconds per take, it was like shooting and editing at the same time, and that was really, really fun and of course less stressing than digital when doing the final editing, having to deal with hours and hours of long takes in post now!

You can record 1376x1030 (4:3) 12-bit lossless continuously on the EOS-M in Movie crop mode no problem (or 14-bit lossless though that may reintroduce focus pixels). In fact you can record any resolution and aspect ratio with magic lantern, the limit is the camera's write speed. You can go even go up to 1440x1078 with the 5x zoom function as mentioned in the first post here (that's different to Movie crop mode) - though I haven't tested that yet.
In terms of recording time with 1800x1024 12 bit-lossless, I'm getting between 10 seconds (very worst case) to 1 minute or so. Just tested it again and actually it seems that the amount of contrast in an image affects record times more than anything. If you want better record times in 12 bit, probably best to lower the res to 1792x1008 or so.
Also I've just started using another program to convert MLVs to cdng files which has a very nice interface and features: https://ilia3101.github.io/MLV-App/   it was suggested by this youtube user: https://www.youtube.com/watch?v=_yXb2bt8l60
I definitely miss my old BMPCC too. For sure the XC10 is much more ideal for normal HD filming than the EOS-M will ever be, but still the EOS-M isn't too bad for a camera that costs about £100.