I'm just getting into large format black and white portraiture. I've taken a few 4x5 shots using strobes in a studio, and the results have been great! But I find that focusing sharply on the subject is either hit or miss. Either the subject is sharp or not. I'm shooting at 5.6 and 8 on my 210/5.6 for all my shots, and my strobes sync at 1/125. So my depth of field is vary narrow. And by the time I confirm focus, shut the lens, insert film, and pull dark slide, the subject could have moved slightly out of the plane of focus even if you ask them to be still. Does anyone have advice to help me? Thanks