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Hi Lee. I know for mine GSO 8" F/4 the secondary mirror is 63mm. what about longer collimation screws? also, what adapters do you use to attach the DSLR into the focuser? if it is:
focuser --> prime focus adapter --> t-mount --> DSLR
unscrew the 2" barrel from the prime focus adapter. If it is a standard t-mount ring, there is a small inner ring attached by 3 screws. take this ring out and put in the 2" barrel instead. This will give you more in-focus. make sure the 3 screws are fully tighten.
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