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Old 31-07-07
redruthann redruthann is offline
Canon XTi-New to DSLRs
 
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Question High ISO speeds and Noise

Hello again,

I am new to dslrs (Canon XTi) and manual photography techniques for which I have many questions...I'll post each separately (hope that's ok).

Please explain ISO speed, re higher speeds and noise.
I have not gotten the fstops down, but I experiment a lot - changing them to the exposure I want. But when I use 400 or more ISO, there's so much noise.

I have been taking pics of birds in my yard. Obviously they do not pose for you. I play with the f-stops and try faster ISOs. What situations use higher ISO speeds?

Using: Canon XTi; Sigma DG 28-300mm 1:3.5-6.3 - Telephoto/Macro
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Thank You Very Much for Your Insight,

Ruth...
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