Steve Gibby
Red Savant
If it is the case that 300's are changed to T-stops in the future I for one would not want one of the early model F-stop versions.
I would, in fact, I have one of the first 300mm primes coming to use on my RED #8 camera for nature and sports shooting. I'll be setting exposure via RED's integrated histogram and zebra displayed on the EVF and LCD, thus whether the lens is marked in T stops or F stops is not an issue to me. I will also be shooting 4k REDCODE RAW and 2K REDCODE RAW almost exclusively when I use the 300 prime, with the added ability to tweak exposure (and other parameters) with REDCINE before sending the footage to post. Mobile shooting focus will be via use of RED's Magic Focus function with the EVF and LCD. Thus whether a lens is marked in T stops or F stops is really not that relevant to my field and pre-post workflow.
I'll happily look forward to receiving my RED 300mm prime with RED #8 - no matter what it is marked in.