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Another thing to be aware of is the difference between focal ratio's. A fast short focal length f4 newt will allow for shorter exposures and easier guiding but will need a coma corrector and very precise collimation. If you go the other way with a long focal length scope (like an f8 RC or cassegrain) you will need long exposures and a well set up mount as any errors in the system will be very apparent. The sweet spot for easy to manage newts is around f5 or f6.
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