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Posts posted by SDSO
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The SCT gives you loads of back focus so you can get away with the big celestron and meade OAG but I wouldn't recommend it. Go for the TS 27mm one or if you have a starlight express filter wheel - use their OAG thats designed for it.
Which OAG for SCT please ???
in Imaging - Discussion
Posted
good point themos - if you are using a focal reducer you need to put your camera a fixed distance behind the reducer to get decent reduction and star shapes. This generally means a thin OAG is best - TS do a 9mm one.....