How do you focus a 90mm on the Tech IV 5x7? Actually, it should seem pretty straightforward, simply drop the bed and focus by moving the front standard inside the camera by hand. It is precise enough to adjust the focus. Problem is it doesn't hold in place when in that position. It is loose on the rail and cocking the shutter or simply the push of the bellows can produce a focus shift. A wide-angle adjustable board would not help as it is the standard that moves, and then the lens would not go on the 4x5 camera. Perhaps it is not normal that the front standard doesn't hold it's grip on the inner bed?
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