probally cause its one of those features alot of people dont do.. if you need to, rent the varicam for that shot. I bet most people wont even go so far shooting off spead let alone ramping.
Plus, NLE's do a decent job at Velocity Envelopes now adays so your not totally screwed.
Plus, NLE's do a decent job at Velocity Envelopes now adays so your not totally screwed.