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Can be done Eric but you may not be able to get focus....borrow a barlow before you go buy one.
And yes it will slow down your scope meaning your going to need to take longer exposures and more exposures.
Thats why I am not that thrilled imaging at F10.
Give a 2x barlow a go.....3 x would be far too dificult to manage and at F12..well hardly worth while....you would have to image for 5 times your current exposure time for the same result.
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