Donald Qualls
Subscriber
put the lens on T, trip the body shutter button, then trigger the lens, count your time, then re-trigger the lens.
Actually, worse than that with most RB lenses (at least the 50, 90, and 250 that I have): you can't retrigger the lens to close; when in T, you can only close the shutter by recocking the body. For myself, I'll happily trade that off to have a fully mechanical shutter self contained in the lens. Yes, it can wear out -- but it won't likely fail dead without warning, and even if it does, I just put on another lens rather than scrap the body (or pay more than replacement to get it repaired).