Aperture size to optimise SNR

Posted by brandx on May 07, 2023; 8:23pm
URL: http://astroimagej.170.s1.nabble.com/Aperture-size-to-optimise-SNR-tp2228.html

Does the aperture automatically size to optimise signal/noise ratio for an image or does it require testing different sizes (including annular) to get an optimised SNR?  Does this also need to be done for all images in a sequence?  As far as I can tell once an aperture size is selected it applies to all images which may not give an optimised SNR for each