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Hi you all :) I'm trying to figure out the exact timing of the mirror vs. the registration pins in camera using Mitchell type of movement and 170° shutter angle. My camera is a Russian made Soyuz US3N so it is not a exact copy but close enough to some mitchells. Generally, when are the reg pins supposed to engage in Mitchell movement and when they should retract compared to the mirror edge? I have to be able to time this myself every now and then because of lubricating etc. so can't ship it to a camera tech. The movement should be in factory specs so no need to adjust it, so... Are the pins supposed to engage just a tiny bit before the shutter opens so that the pins retract a moment before the shutter closes for film transport and the claws start to transport film a tiny bit before the shutter is fully closed, or... ...are they supposed to engage at the exact moment the shutter opens so that the shutter can fully close before film transport begins but the tiny moment the shutter opens may have some instability when the pins are centering the film, or... ...is the timing in the video about right? to me it looks like it is just a tiny bit off and the pins should engage just a tiny bit quicker after the shutter has passed to ensure the stability of the start of the exposure. but am I then risking instability at the end of the exposure? This is pretty difficult trial and error to time because of the wormgear like gears used in the camera but I can live with a little off timing :rolleyes: https://www.youtube.com/watch?v=BITn7xuDses I also asked this at Motion Picture Technology group on Facebook, let's see what they think... :lol: