In a previous article I explained in detail what ISO does in the camera and what, in general, is the best ISO value to use for astrophotography. Basically it comes down to finding the ISO value from which the upstream read noise will swamp the downstream read noise. Any ISO value beyond this one has no additional benefit and only decreases Dynamic Range. Remember; ISO does not increase the sensitivity of the camera, increasing it doesn’t capture more light.
1 of 100 Al Tielemans Phil Mickelson chases the sunset during the third round of the 2013 U.S. Open at Merion. 2 of 100 David Cannon/R A/Getty Images Claret jug to go: Phil and Amy Mickelson leave Muirfield with the hardware on Sunday evening at the 2013 Open Championship. 3 of 100 AP Phil Mickelson smiles at Tiger Woods after Woods won the 2002 U.S. Open Golf Championship at the Black Course of.
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