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For the ED80 I'd use just a telrad or other red-dot-finder. For my Megrez90 I just use the William Optics red dot finder and great. An advantage of them over the finder scopes is that you can be some distance back from them and still use them - I often look at my red dot finder from about 50-100cm away due to viewing convenience.
For the C8, I think you'd need some magnification so a red dot finder on it's own would not be sufficient, but I could be wrong.
I have a friend who has a telrad and 90 degree finderscope on his dob. Works well for him. Personally I don't like the 90 degree finder because with all finderscopes and red dot finders I rely on having both eye's open and overlaying the two images, so to speak. You can't do that with a 90 degree one.
Roger.
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