Frankly, I’m not seeing any issues with the video. I don’t see any lines. The image is really underexposed, though. Even low-light tests still require enough light to use the camera and lens the way they’re supposed to be. Even the Zacuto low-light tests had a lot more light than they were letting on (in a professionally-lit environment I’ll add). I think you are trying to use no-light (or as little as possible) which isn’t a good way to test your camera. For one, even with a f1.8 50mm, you want to have it in the f4 range and, ideally, starting in the f8 range (if you can’t see anything, add light) since f8-11 is the range most lenses are designed (wide open is a last resort). Consider a cine lens – you can rent from places like Borrowlenses for very little $. I’ve seen a lot of complaints about the Canon 70D and it’s lowlight, but in nearly every case, the environment is at almost NO light (no camera works well in no light). Despite this, every camera that captures video needs lots of light to work correctly and even more to work well. You aren’t doing your camera any good with a minimal exposure – you aren’t testing anything at that point because the camera has no range on the low end – you’re just looking for the lowest limit not a range. If you want a good lowlight performer for video, consider a video camera instead of a DSLR.
Save early. Save often.
Jonathan Ziegler
http://www.electrictiger.com
520-360-8293