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Originally Posted by rally
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Yes, something like that would be fantastic, but maybe a bit over-optimistic for me to achieve
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ND filter probably not, you should be shooting around 1/250 - 1/125 sec, no slower. Test shooting the moon at approximate phase first to nail down what settings you find acceptable for exposure of the moon (the ISS will be black / underexposed).
It will move across the moon quickly so use a good high speed burst mode to have a hope of catching it. Choose whichever camera gives you more pixels across the moon, should give you more detail of ISS (test before hand and measure for yourself to decide).
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Which scope is better suited, the 127mm or the SCT? I would think if I want the most pixels I would want the narrower FoV to start. But as you mention, timing and exact tracking will be hit and miss. How do I measure the number of pixels? (this whole pixels per arc second and per FoV baffles me a bit... but I guess I need to learn it sometime
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I have a Nikon D7200, 24 MP, 6-7 f/sec, a Canon 5D, 20 MP, 4-5 f/sec, and a 7D that is supposed to be capable of 8 f/sec, but is only 18 MP. Recommendation?