Quote:
Originally Posted by 04Stefan07
I used to have an ST80 mounted on top of my tube as a guidescope. Although it worked ok and the weight is fine I never really got it configured correctly as a guidescope.
For those with an 8" or even bigger SCT what do you use for a guidescope and how do you mount it?
Thanks,
Stefan.
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Unless you have some kind of mirror lock I'd recommend using an OAG for any SCT or you might find yourself limited in exposure time because of flexure, no matter how tight your guide scope is, your primary will always shift a little. A three point lock to support the primary is ideal. It supports it while still letting the glass expand and contract with temperature without stress. An OAG will follow a mirror flop, so worst case scenario will be a slightly tilted field but no star trailing over time.