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Erect Image Diagonal
Hey everyone,
I have a Celestron Nexstar 8SE. I want to buy a 45 degree (that's the degree Celestron seems to recommend) erect image diagonal for terrestrial viewing. I've looked around and there seems to be a few types that are essentially the exact same but are priced anywhere from $39 - $90. What are the differences? Should I just get the cheaper one, or is more expensive branded ones typically better?
Also, what effect do these have if used while looking at planets?
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