Originally posted by luftfluss With practice I think you will
I shoot a lot of long tele, and my only long tele lenses for the last few years have been old manual focus ones, so I have a lot of time in.
My birding tele is an M 400/5.6, sometimes with the AFA 1.7x on the back (680/9.5). I have my eye out for a 500/4.5 as a future acquisition for the extra light for focusing, particularly with the 1.7x.
Mallard taking off. ISO 400, 1/320, probably f9.5 (wide open) with the M 400 and AFA 1.7X. Manual focus is not much of a problem for me, but I must make sure I set the diopter correctly!
A fuzzy viewfinder makes for a fuzzy photo, I find.
My first Pentax had no aids for anything, 2 shutter dials using the old 1/25, 1/50 sequence High/Low handoff at 1/25. First lens, 55/2.2 preset, Second 135/3.5 preset, both Takumar.