I've been practicing setting up and taking down a new Tachihara 4x5 field camera and have some questions about setting the minimum bellows extension. The instructions say to unlock the infinity locks and then pull the front standard to the "appropriate" position, based on the lens focal length (135mm in my case), and finally re-lock the infinity locks at that position. How do I measure the "appropriate" position? Is it 135mm, measured from the face of the front standard to the back of the rear standard or some other reference points? I assume that once this meaurement has been obtained I should mark the rail for future reference so I don't have to re-measure every time the camera is set up, or is this not a particularly critical measurement?
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