Just after the First Quarter – September 17, 2018

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A short night time test of my new/old achromat refractor. It looks like this scope is OK in the green part of the spectrum (as any good achromat should be).

Following is a shot of the Moon, using the ASI1600MM with a green filter, placed directly in the focal plane of the scope. The Moon was rather low, at 20 degrees above the horizon, and the seeing was around 4-5/10.


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