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I generally post between 800x530 and 1000x650 px depending on the compression ratio required... Shots of targets smack bang within an intense star field like the tarantula or M8/M20 require more compression, so I post them at lower resolution, targets like NGC 253 or the Helix are in relatively sparse areas of the sky, and hence generally require less compression, hence, higher resolution...
I will usually scale the image size to keep the image quality up above 65~70%
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