f stops on lenses


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Jan 13, 2009
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#1
Hi all,
would like to ask this question.

say a 18-55 lens has a f3.5-5.6 f value

so why can it go all the way to 3.5 at times

but other times only till 5.6 ??
 

Dec 28, 2008
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Singapore
#2
juz something to clear up your confusion. its at f3.5 when at 18mm, and can go up to f5.6 at 55mm ... its not a matter of different fstops 'at times', as it varies according to your focal length.
 

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