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I've never done this before but I completely understand the theory. So I want to collimate a lens and in particular a C-mount Optivaron (6-66mm), originally collimated for the Beaulieu, but for repurposing on a standard C mount camera (the Logmar). I can follow the theory of what's going on in the following guide - basically it's using a camera and lens already understood to be correctly collimated, and focused at infinity, to image the image plane on the other camera, with it's lens also set to infinity, but in an unknown collimated state: http://elekm.net/zeiss-ikon/repair/collimate/ This I can manage quite well using a DSLR as the imaging camera - or rig up some alternative setup with diode lasers etc. Can do all the required levelling, making sure it's all parallel etc. What I don't know, but would love to know, is what I need to do with the Optivaron lens in order to modify it's collimation setting. I understand it will need to be partly disassembled. I'm perfectly fine with that. Just don't know what rings/notches/or whatever, inside the lens, need to be rotated/moved in order to tweak it's collimation setting. I can certainly open it up and experiment (and will eventually work it out) but if someone knows how to do it already, that will certainly save me some anxiety. Any advice much appreciated. Carl