Shutter Speed for ISS transit of the Moon

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Jeff Bondono Regular Member • Posts: 403
Shutter Speed for ISS transit of the Moon

I photographed an ISS transit of the sun at 1/1600 sec shutter speed last year and it turned out great. Without thinking it through, I shot a transit of the moon last night at 1/100 shutter speed, what I'd typically shoot the moon with, and the ISS was just a blurry blob (moon in focus). I'm shooting with an A7R4 (pixel size 3.76 micrometers) through a 480mm focal length telescope.

The ISS moves across the 30 arcsec diameter moon in about 1.75 seconds.

Can anyone tell me the slowest shutter speed to freeze the ISS using this setup (or some other setup which I could convert into mine), or point me to the formulae for me to figure it out myself?

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