Quote:
Originally Posted by AlexN
Forget using the Mak for guiding... its got a moving mirror, and will wreak havoc during exposures... the 80x500 achromatic refractor is the way to go for guiding...
The mak's longer focal ratio will make finding a guide star more difficult, as the same star will look much dimmer through the Mak than the refractor...
In my opinion, go the refractor for sure!
What guide camera are you using? have you considered off axis guiders?
Orion make a good OAG for $209.. That way you only have one scope on the mount, no possibility of flexture, guiding at the same focal length as imaging etc.. Provided your guide camera is sensitive enough, that would be the best way to go in most situations...
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Have heard all this before but its not necessarily true.
I use a 90mm Mak for guiding piggy backed on my 8" SCT. Works a treat. Have guided for 4 hr total at 2000mm FL with an SCT and Mak. No flex, no mirror flop. Tried an OAG and gave up as couldnt always find a guide star. Also use an X-Y shifter and makes finding a guide star easy.
Easy 19 min subs and across the meridian. It works for me and I dont see why it shouldnt work for others.
Just my 2 cents and experience.