the focal reducer on my mak reached focus , though there wasn't a lot of room left.
When attaching the camera do you usually have the diagonal in the path? i never used my diagonal when photographing so it wasn't a problem.
For 1. - when you say you can't reach focus with the crayford what do you have next in line form the focuser out?
Some of the focal reducers come to focus with cameras but not necesarily visually
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