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HDSLR cameras have added a new dimension to the idea of "revolution:" the vast choice in lens options is every independent filmmaker's dream come true. No longer are shooters stuck with a fixed lens of dubious quality or limited focal length. No more wide-angle adapters, or telephoto adapters, or even going the extra step with secondary lens adapters. Now, you simply pick the lens you want, specific for the type of shot you want. The only limit is your budget. There are even manufacturers developing lens adapters to fit exotic cinema lenses (like PL-mounted Cooke, and Zeiss optics), which work well with smaller sensor cameras like the Panasonic Lumix DMC-GH1 and Canon 7D.
I've been a long-time Canon SLR shooter (both film and digital), so at this point, my lens arsenal is quite large, and includes Canon FD, Canon EF, Nikon F, and Sigma mounts. With my 5D Mk II, I purely shoot with Canon's best "L" lenses, mostly consisting of their fastest primes and a few zooms.
Although the imagery from these still lenses is astounding, there are differences between them and film / video lenses that you should know about.You can twist the focus ring on cinema lenses for days from lock to lock, for detailed focus pulls. The short twist on still lenses can be a little annoying if you're tight on a slightly moving subject (even a talking head) with very narrow DOF.
Annoying or not, at least these focus rings move only from start point to stop point. Compare this to the electronic focus ring on a lens like the beautiful Canon 85mm f/1.2L II. Although one of the absolute sharpest and fastest lenses on the market for photography (I know, I have one), a lens like this can seem downright evil for video: the electronic focus ring just doesn't have that physical feel and feedback to it , and worse, will keep spinning forever, even when you can't focus anymore.
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Controlling aperture with a physical ring on the lens itself is also ideal, preferably without f-stop click-points - rather than the push-pull mechanism found on some photographic lenses. Although ring gears can be temporarily added to any lens (I use them), they're usually bulky, a drag to take on and off, and simply not as effective for follow focus and / or motorized control. The good news is that some companies can modify your photography still lenses to employ some of these cinema style features, including clickless aperture stops and permanent ring gears.
Although I prefer Canon optics, I definitely prefer Nikon mechanics in their F lenses. They employ physical lock-to-lock focusing and a physical aperture ring, making them a good candidate for such cinematic style lens conversions. A trick I've sometimes implemented is using Nikon lenses on my Canon body, by buying cheap Nikon F mount to Canon EOS EF mount adapters. There are some good buys on used F mount lenses if you're on a tight budget but want more physical lens control.
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