I currently own a canon 70-200 f/4 but simply don't use it much for filmmaking, I use it primarily for photography. I've been looking around and have found that the rokinon 85mm prime cine lens is a pretty popular prime. It's affordable and sharp. Would it be worth selling my 70-200 and picking up the 85mm and maybe a 11-16 as well? I also own a tamron 17-50. +k for helpful responses! Thanks!
Don't sell the 70-200. Whenever I am home I always try to use my moms 70-200 f2.8. It's a great range, and all of them are very good lenses.
I would just use the 70-200. I don't really need to shoot wide open very much. If you want a cine lens, save up for an actual one that doesn't breath when focused etc. IMO, the cine versions of the rokinon lenses are mostly for the same people that buy matteboxes that don't hold any filters, some function, but mostly appearance (which sometimes is actually important for clients).
treadmills are the trick to everything. fat chicks, skiing on grassy flat back yards, OK GO videos.. - jibnut
as said above I'd definitely stick with the 70-200 and look into a good deal on the rokinon whether it be a used lens or on eBay or something. I love my 70-200 since it has so many uses and would never sell mine.