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Originally Posted by ballaratdragons
Mike,
I fixed it by simply turning the collimation screws 2 full turns which moved the mirror forward about 2mm. It was enough to make the toucam pull focus and have a smidge past focus as well.  |
This is quite commonly-given advice, and it works well on scopes where the mirror is collimated by means of a pair of push-pull screws. But if the primary rests on three strong springs and there are no locking screws, this will result in lessening the tension in those springs. The disadvantage of that is that the mirror will no longer hold collimation when the altitude of pointing the scope changes. In a spring-supported primary cell, collimation will require the springs be nearly completely compressed in order to hold collimation.
Just be aware of how your mirror is supported before you try moving it forward this way.
Don