|
Rod
I originally used a 50mm guide scope with my 6” f6 for a while but when I jumped up to the 8” f5 newt 2 years ago I bought an Orion 60mm guide scope with helical focuser. Has a good focal length of 240mm ( old 50mm was only 162mm ) nice wide field using the ZWOASI120MM - S USB3 guide camera , and so easy to focus
No issue at all finding a good guide star with PHD2
Your 10” f5 would have a focal length of 1200mm to 1250mm so the Orion 60mm would work well
OAG is an option but a different ball game , maybe start with the guide scope for a year or so and progress to OAG if you see the need to ??
Cheers
Martin
|