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Originally Posted by UniPol
Hi Matt,
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A couple of photos of the in and out focus of a bright star are shown here taken with my 350D through the C11. I can't recall which star or the magnification however they looked pretty good judging by published images of star tests. Needless to say the scope performs very well and he is very pleased with it.
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Cheers, Steve
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Hi Steve
When I am way outside or inside focus, I obtain images very similar to the 2 you have posted. To limit the diffraction rings to just a few around the central maximum, I need to use relatively high magnification and then turn the focuser slightly, by small amounts, inside and outside of focus.
Cheers
Dennis