Thanks everyone, I really appriciate the detailed replies! I was getting somewhere with another build last night which had an auto UHS-SD hack and I was able to record in higher quality and at higher speeds.
This is the build I used - magiclantern-Nightly.2018Jun17.700D115_sd_uhs by Dannes or something similar.
I've taken on your advice and went with a clean install but that 4k build does not have a UHS-SD hack module and for the life of me I cannot find where or how to install it without it preinstalled in the above build. I did copy the modules and LUA script file from the build above but then I was getting "Unable to detect RAW" errors.
With this 4k build I am unable to even choose 1736 x 976 resolution. The max it will let me choose 1728x972 at 16:9 (I need this aspect ratio for framing compostion) at 30fps and the write speed is 84mbps and skips frames immediately.
On the build with the UHS-SD hack I am able to select 1736 x 976 x 30 fps x 14 bit lossless and I have done three tests, all exported through Premiere at their respective FPS apart fromthe picture example which is a screengrab from MLVapp.
First test. 1736 x 976 x 30 fps x 14 bit lossless and 60 shutter speed. https://vimeo.com/308489397The second clip is an attempt at shooting in crop mode? No idea if it's working correctly, I pressed zoom in 5x, live view is black and white, hit record.
In my opinion the aliasing is still pretty bad at in the first clip but in the second; in crop mode, it appears to be better on the powerlines, however there is noticable juddering on the cars now....
Lastly I tried shooting in crop mode at 2520x1080 x 24 fps x 12 bit lossless and 48 shutter speed - https://i.ibb.co/jwBLNyw/vlcsnap-2018-12-28-10h36m18s722.png - little under exp I know.
How am I doing? I don't know, it still feels pretty poor on the wide angle lens, I understand that technically there is no issue with the lens but it still looks bad doesn't it?
P.s I must say that I am notlooking for unlimited recording time anything from 10-15 seconds would be fine and that I always shoot in either 24/48 or 30/60. I am using the sandisk extreme pro 4k 90mbps card.
More issues:
1. If crop mode is working correctly, then how do you compose your frame when recording, especially if you are moving with a gimbal? I understand there are trade offs with ML, though is a slow black and white liveview one of them in crop mode recording? - Am I using crop mode correctly?
2. What is this in the top right hand corner, I understand it's recording time usually but what is the number on the right? Am I losing frames?
https://i.ibb.co/KV4SLFB/frae.jpgEDIT: Now I can't record in crop mode at 2520x1080 x 24 fps x 12 bit lossless and 48 shutter speed without instant frame skipping..... come on need a break.