It seems that you aren’t very familiar with camera specs so let me lay a few out for you.
The 5DmkII is, obviously a dSLR while the XF100 is a camcorder. The difference will dramatically determine your shooting style. The 5DmkII is a slow, cinematic, shooter — for it to be stable and useful you need a lot of support equipment (brackets, monitor, external audio recorder) and the shallow depth of field isn’t conducive for run-and-gun shooting like it sounds that your situation (car racing) calls for.
Let me get this out of the way:
“however I can never seem to match the softness, fast movement focus and depth of field”
The 5DmkII has a Super35 equivalent sized sensor while the XF100 has a 1/3″ sensor. The smaller sensor of the XF100 increases depth of field dramatically and, while not useful for a cinematic look, allow for sharper footage useful for news/documentary/reality and so on.
The XF100 also has SLR inputs for audio and a better on-board mic.
The XF100 allows recording at 60 frames per second natively. This is better for slow motion in post production.
The XF100 also records with a better codec — MPEG2 4:2:2 @ 50mbps. The 5DmkII records MPEG4 4:2:0 @ about 35mbps. While MPEG4 is a little more efficient than MPEG2, so the bitrate isn’t directly comparable, 4:2:2 records more color making post production color correction as well as the ability to key out green screen easier.
If you want a full package, I’d go for the XF100. If you want the cinematic look, go for the 5DmkII. The 5DmkII is a very capable camera and I’ve filmed race cars, tv commercials, short films, etc with it. Pull no punches though, if you get a 5DmkII, be prepared to spend at least $1,000 (probably closer to $2000+) in support equipment before it’s as easy to handle as the XF100 in demanding situations.
The only caveat I have is I’ve never used the XF100 in a really low light situation so I can’t comment on its image quality there.
Angelo Lorenzo
https://filmsfor.us – Helping you sell your film online
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