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Hi Bruce
If your 10in Newt works well for imaging (after your mods) you may consider staying with it. If you go down to 6in you will only have about 1/3 of the light gathering capacity of your 10in. If you must change you may consider stretching a bit to get an 8 in RC. I have one and I am very happy with
the quality of the images. However, I do have a problem with unwanted reflections when I have a bright star in the field eg when I am imaging
the Flame nebula with the bright star Alnitak in the frame.
Cheers Peter
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