I remember reading somewhere, never shoot LF lenses wide open.. however, I don't remember the reason why. Recently I was forced to shoot my Fuji 600C wide open .. which is f11.5...I needed the speed, I focussed on a subject at infinity, and the GG looked very sharp, I figured I would go for it... I was very disapointed at the results, the chromes showed showed very soft focus? I had changed the c amera angle a few times, each time I refocussed, so I am sure it was not some si lly error like bumping the camera or not having the focussing knob tightened all the way, etc.. Does anyone know what occurs when you shoot wide open with LF l enses?