Before using Magic Lantern, I've mode a long long research..... I'll post what I know here, but please verify before counting on it :-).
1. I'm not using the 4k experimental build. That build has 4K, but not for the 700D. Also, in order to use larger resolutions you will have to use the 'Crop' Mode, which I like less. Mainly because I'm using the 18-135 lens, and I cannot get the effect of the lower range.
The build I'm using is a bleeding edge build, that as far as I know only 700D and EOS-M are currently supported for.
Link to post:
https://www.magiclantern.fm/forum/index.php?topic=5951.msg214395#msg214395Link to download (700d):
https://web.archive.org/web/20200717085052/https://bitbucket.org/Dannephoto/magic-lantern/downloads/crop_rec_4k_mlv_snd_isogain_1x3_presets_2019Apr02.700D115.zipIn this build, I can use the 1x3 mode. It's not so easy to explain, and I hope I understand it correctly - but when recording video, the 700d (and many other non-high-end-camears), are skipping some of the pixels of the sensor (Thats why you can get high res photos, but only 1080p video). That might cause Aliasing and Moire.
The Bleeding edge 1x3 mode allows you to record ALL line-pixels, which means no aliasing or moire. Also, the mode allows you to record at a higher resolution than possible in other modes.
But the higher resolution is not exacctly "normal". Because you're getting more line pixels, the image is going to look squeezed, so you have to scretch it later on in an editing software.
So my final output is upscaled 4K, BUT, all my line-pixels-data was not scaled because I had more of them.
I hope it makes some sense. If not, I can try to explain it again (or you can just search the forum...)
In this mode you cant see exactly what you're filming, because it's scretched. but you can click "info" a few times and see what you are actually filming (but in a lower fps).
you can still work with it, you just need some practice, but its not the best...
2. I like the 700d, but there are some limitation that you must know:
2.1 The maximum sd speed, even with the UHS module is only at about 50MB/s, so you wont be able to record at the rates EOS-M can
2.2 The autofocus is annoying, and I mostly work with manual focus. And its even harder with the small screen/scretched image.
2.3 The screen is not that big...
3. If it's for the screen alone I'm not sure if you should upgrade/buy the 700d, because you can use ZEEK trick (Which is really cool, but I didnt try it yet), and mount your phone.
You will get a bigger screen, and you can probably tilt it.
