Laser-based sprocket registration

[vintagefilm]

I have bench-tested a Keyence retro-reflective laser. Here is a link to another thread here.

Existing Film Scanning Machines

Solid points, which I will certainly keep on hand for reference. Thanks! I’m having trouble visualizing the Keyence laser/reflector setup. Could you post a diagram? Any ref pics of the Muller setup would be appreciated too! Thanks.