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Hi Alex,
I'd like to spot my secondary as well, can you explain how you calculate the offset along the secondary plane from its centre?
I do understand the concept of the offset, but not sure how you measure and spot the secondary accurately.
and the other thing, how do you measure the offset from the secondary holder? I bought mine second hand so no idea if it has.
mine is the 8" F4 with the 63mm secondary.
btw, have you tried adding a 1.25" barlow to the collimator? since the angled glass is frosted in this collimator, I'm not sure if the primary spot will be visible in the diagonal of the collimator. but worth a test.
edit: slightly off topic from the laser, but just struck me that if the secondary is offset, then do you still centre the secondary with a sight tube? i'm guessing not, and that would explain my collimation woes.
I'm using a 2" extension tube and then a 1.25" adaptor as my sight tube with a paper underneath the secondary to improve visibility.
thanks
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