<a href=showthread.php?s=&postid=11288268#post11288268 target=_blank>Originally posted</a> by glaudds
More hijacking...AV priority, ISO 400, f22, shutter speed 0.5, AWB
the reason why you get darker pics when you set your ISO lower is because your aperture is a small pin hole right now.
take a look here
So when you set it on AV you can only change the f -stop
At f22 the less light is coming in so this is why ISO1600 is giving you a better picture. To break it down easy ISO is how fast the film will react to the light. so ISO 1600 basically means its going to catch as much light faster than a ISO film of 100 so this is why it seems better to have your ISO at 1600 with f 22. This is another reason why your shutterspeed is super fast !. Its only allowing a quick snap of light to come in since your ISO set at 1600.
You can meter the picture to get all the right readings. Minus ISO ( you have to see what speed it needs to be depending on ur aquarium lighting)
set camera to green rectangle then tap the shutterbutton lightly , you should hear a small beep beep sound. then just look at the cameras settings.
write these all down , then try all the same specs on Manual. You should get the best or better result out of that if the shutterspeed suggests something below 1/125 ( not sure the shutterspeeds on the rebel xti) then use a tripod. but if its like above 1/125 the you should be able to take pictures with hands.
And Glaudds I have no idea about AWB I am old school so I am just used to having the best film for the color balances
man I am going to have, to have classes now for beginners guide to SLRs:lol:
O and what are the f stops on the lenses on yours and yingers