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Here's a small area of M31. Data captured at DSW with Rokinon 135mm lens and KAF-8300 sensor (image scale 8.62 arcsec/pixel.) First image is 1x1 integration, second is 2x2 drizzle 0.7 drop size and third is 3x3 drizzle 0.7 drop size.
FWHM (pixels) measured with SubframeSelector is 5.172 (1x1), 4.861 (2x2) and 4.73 (3x3) after upsampling the 1x1 and 2x2 to match the 3x3.
The 2x2 is clearly superior to the 1x1. With blink I can see a slight improvement in star size but no other visual improvement going from 2x2 to 3x3.
Cheers,
Rick.
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