I can't give a comparison between a finderscope vs larger scope for guiding as I have only ever used the finderscope. I've also only regularly guided focal lengths up to 640mm.
Everything works with ease using my TS115/800 and reducer though I'm sure more care would be needed with long focal lengths.
My finder/guide scope only needs to be approximately in line with the main scope and the polar alignment routine built into the mount is plenty accurate for my needs.
I did shift the finder scope into a more rigid mount, though I never had any issues with the first setup.
Last edited by casstony; 24-02-2019 at 09:57 AM.
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