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There's nothing wrong with the c9.25 for deep sky as gem suggests there is. Do have a look at his pictures in the beginners astrophotography forum .i looked at the picture of m20. , detail and colour was great but due to mismatch between camera and telescope the ifield of view is too small. If you look back to my m42 taken with a dSLR size sensor and .63 reducer , shown in previous reply above, you'll see the field of view is very much larger and still flat.
Philip
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