Even though I've got Nikon lenses I'm getting the Canon Birger because odds are it will work better, sooner and my camera is coming sooner. Plus some Canon's have image stabilization that may translate better to RED than Nikon's based on some things I've read. That's a wildcard though...
I remember a post by Erik from Birger stating that the Nikon mount will offer better iris control because their Nikon mechanics will have more steps. Here it is:
Canon lens irises are limited to 1/4 stop per step... mathematically it is really 1/3 stop per step, but there a four steps per stop - wrap your brain around that! Nikon lenses are only limited by the resolution of our mechanism, which will probably be better than that in the Canon lenses.
Some of the really inexpensive Nikon lenses have a direct encoder on the focus mechanism (after the gear train) so these may offer better performance than the equally inexpensive Canon lenses. But I think this last distinction is meaningless, as one is not going to spend $17K on a camera and $1K on a lens mount to use a $99 lens
I'm A LOT more worried about smooth accurate focus. And odds are you could smooth out the Canon 1/3 iris increments in post if they are noticable.
After fumbling around with an old AI-S nikon lens all day trying to get accurate focus, I am now shure, that I will go for the birger canon mount and a supergrip. Maybe you can get away with using nikon primes on a tripod with ff and gearings but for anything handheld things are gonna fall apart. Critical focus is at the heart of 4K, and the focus throw of the AI-S lenses is way too short at the long end. The 35mm f/2 has about 2cm clockwise to play with from 1m-infinity! Also it is a bit sloppy when you are racking back and forth.
Secondly I believe that the canon mount will (unofficially) support foccusing with sigma primes and tokina zooms (for canon) which open up some nice bang for the buck options. (please correct me if I´m wrong on this) A set of atx pro zooms from tokina would do the trick for me for now (apart from a little CA they have an outstanding performance and a nice build based on angenieux patents) leaving plenty of cash for some more exotic lens choices along the way.
all the best Eddie
And remember no matter what lens you are using to always go wide open and stop down to your chosen stop. But you guys know that. lol
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