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If you have a DSLR or middle weight astrocamera hanging off the back of the ED80, then you'd be better off mounting the guidescope on the dec axis. If you put too much weight towards the back of the scope, you'll have problems balancing the tube and will have to add counterweights to the front of the tube to get it to balance. I can only just get my ED80 to balance using a DSLR. Have to push the tube rings as far back as possible.
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I do have a DSLR camera, so that might be an issue. I'll have to test it out once I have all the equipment (some of it is still being delivered).
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An alternative option is to put rings/clamshells around your ED80, another set of rings around the Orion mini guider, and then a dovetail in between the two. For example, take a look at this kit:
http://admaccessories.com/V_Series_Guidescope_Kit.htm
The 75mm rings will suit the Orion mini guider perfectly (I've done it). You just need another set of rings to go around the ED80. You could even replace the ED80's "foot" mounting with a dovetail bar attached to the clamshell rings, though it probably wouldn't be necessary.
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OK, I didn't know the mini guide scope could take rings. Once it arrives, I'll compare it's bracket to the ED80's finder scope bracket, and decide from there what to do, but it's good to see it can be placed in a set of rings.
Either way, you've all bought up a lot of possible solutions, so you've alleviated my fears of ordering a combination of equipment that couldn't work together. Once I have all the parts in front of me, I'm positive I'll find a way to get it done. Thanks for all the help.