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I have used paper before to go effect. The shims I have of course are designed to go round a screw, so they would not be very useful if you wanted to shim up the entire side of a nosepiece.
CFZ is Critical Focus Zone - you simply have to know the smallest CFZ appropriate to your system (as it varies by filter), because if your focusser doesnt have the resolution, you will skip right past your CFZ and never be at optimum focus.
cheers
Martin
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