I don't have an Aero Ektar, but I considered them for a while. And I shoot other very fast lenses. Definitely the problem is the super short depth of field. I know with some of my fast lenses it is just an inch or two of sharpness. You or your subject lean forward or back 3 inches after putting the film holder in, and your shot is out of focus. I like tripods and sitting models a lot for super fast lenses.
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