tag:blogger.com,1999:blog-9190121957646296756.post282185813415508999..comments2023-08-01T10:17:14.190-04:00Comments on Stellar Neophyte Astronomy Blog: Borrowing a Canon 350D (Rebel XT) from my mother-in-lawEric Teskehttp://www.blogger.com/profile/02063434845209362789noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-9190121957646296756.post-7562282500023099392012-07-31T23:42:49.556-04:002012-07-31T23:42:49.556-04:00F-stop is basically how much light you are letting...F-stop is basically how much light you are letting in (low number, lots of light, high number less light). I am not sure if it's the same on a DSLR, but in the manual film days, you turned a ring on the lens to change the aperture. Each stop/number on that ring was an F-stop. It works kind of like your eye's iris. Open in low light, closed in heavy light. <br /><br />Wiki has a great figure here:<br /><br />http://en.wikipedia.org/wiki/File:Aperture_diagram.svgMichael Donohoehttp://www.facebook.com/profile.php?id=7703262noreply@blogger.com