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My advice would be to extend your lenses and use what you have.
Samyang 135 F2 gets a lot of good shots. Your SA would handle it easily.
A refractor, even a small one is possible with the SA but not easy.
Also when the focal length becomes longer it becomes harder to even find the objects you want to image. A go-to computerised mount then is needed.
I would say that point is around 250mm focal length.
I have a Williams Optics Redcat 51 and a Fornax Lighttrack ii and I find it:
1. Too heavy for the mount.
2. Hard to find the imaging target.
So a refractor is heavier again and I think it will be a challenge.
So either go lens (lots of targets there) or go a HEQ5 mount and continue with lens imaging and then get a small refractor. 70-100mm.
Greg.
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