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I used the Orion 50mm f3.2 mini guide-scope ($160 from Bintel) for a year attached to my 8inch F5 Newt. It worked great, plenty of guide stars to choose, never had an issue with it, but it does fog up in humid weather.
I was getting around 1arcsec RMS guiding with it on an EQ6, I later replaced it with the Orion thin OAG and got 0.7arcsec RMS guiding. When I replaced the EQ6 with a Mesu 200 mount, I got 0.4arcsec RMS guiding.
OAG's are a pain to setup (took me 2 hours) mainly because I dropped the prism and installed it back to front.
Guide stars are easy to find using an OAG on Milky Way targets, finding a guide star when imaging a remote galaxy can be an issue though.
Last edited by billdan; 13-01-2021 at 01:36 PM.
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