Help! i can't reach focus with my telescope - Forums

Topic starter

Aug 31, 2023

Hello everyone:

I need some advice. I have a GSO 200/800 Newtonian telescope and a QHY 294C Pro. Additionaly i have a ZWO Filter drawer and also an OAG from ZWO. I've recently bought a Sharpstar 1x coma corrector. The problem is that if i insert fully the coma corrector in the focuser, i can't reach focus. So i have to leave the coma corrector partially outside the focuser. My question is if i can solve my problem with an adapter like this:

I'm hoping for some answers. Thank you!

Werner Stumpferl

Aug 31, 2023

Hi Fernando,
If you come in focus with an extension tube then yes. But I prefer the Baader Click Lock instead of such tubes. It can be screwed to the focuser (mostly) and it holds your corrector absolutely strong.

CS
Werner

andrea tasselli

Frequent contributor

Aug 31, 2023

Fernando:
Hello everyone:

I need some advice. I have a GSO 200/800 Newtonian telescope and a QHY 294C Pro. Additionaly i have a ZWO Filter drawer and also an OAG from ZWO. I've recently bought a Sharpstar 1x coma corrector. The problem is that if i insert fully the coma corrector in the focuser, i can't reach focus. So i have to leave the coma corrector partially outside the focuser. My question is if i can solve my problem with an adapter like this:

I'm hoping for some answers. Thank you!

Short answer: No, most likely as the CC tube is too long.
Long answer: You'd need spacers between the focuser's flange and the CC flange.