Why does the ISO change with the shooting mode when the aperture and shutter speed are constant and using a flash?
I have a canon 60d, Canon EF-S 17-55mm f/2.8 IS USM lens, and a Canon Speedlite 430EX II TTL flash. I like to use the manual modes, such as Av and Tv but I am having some difficulties when using the ...
I have a Nikon D5100. When shooting indoor photos using the built in flash, the auto ISO changes to 1600 or so. Doesn't the flash produce enough light so that the ISO would stay at 100 or so? ...
I've observed this behaviour on my Canon 550D, and I was wondering why it didn't use a lower or even variable ISO. I'm not sure if this is a camera/brand specific setting. Is there any particular ...
I found that formula on the Internet: Guide Number = (Shooting Distance * Aperture) ÷ ISO Sensitivity Is it correct? If it is could someone please explain why ISO is related to guide number in this ...