Quote Originally Posted by peety3


Quote Originally Posted by BES


I need some help with ISO...any web pages that would explain well use of which ISO (on digital SLRs) in relation to aperture and shutter speed. I know it may sound basic, but I could use some tutorial. Thanks for your help and making me laugh [img]/emoticons/emotion-2.gif[/img]
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ISO is the same (conceptually) whether film or digital. I often explain it by drawing a complete analogy with a water bucket and a hose:


"Fill up a one-gallon bucket with water. The wider you open the faucet, the faster the bucket fills."


The one-gallon bucket is similar to the amount of light your sensor needs to see for a proper exposure at ISO 100. The faucet opening is comparable to aperture, and the time needed to fill the bucket is shutter speed.


A half-gallon bucket becomes ISO 200, quarter-gallon is ISO 400, etc.


Does that help connect the dots?
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this is great analogy! thanks so much! i am finally getting this stuff [] I think. you guys are the BEST!