Crescent moon - 100% crop from 8(?) stacked subexposures Image Scale = 1.11 arc-second/pixel Date: 2011/05/07 Exposure: 8(?) out of 13 x 1/80 sec at approximately f/9, ISO 100 Lens: Nikon 800mm f/5.6 ED AI-S at about f/9 (seemed sharper than f/5.6, f/8, or f/11) Camera : unmodified Canon T2i = 550D Mount: Astro-Physics AP900 -- rough polar alignment (no drift alignment) Processing: Focusing via EOS utility live view, exposures made from live view mode (EFSC active, so no mirror slap or first…
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