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Old Jul 5, 2008, 4:23 PM   #1
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looking around the forum I came across this post

" EF-S
17-85mm
f/4-5.6 IS


Because of the slow lens, i'm guessing it wont do well indoors?

But good for 'walk-around' lens outside? "

why is this lens classed as a slow lens? is it something to do with the "f" number? what would be considered a fast lens?
thanks in advance for any replies
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Old Jul 5, 2008, 6:20 PM   #2
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Yes it's the f-number that makes it fast or slow.

f2.8 or better is usually thought of as fast
f4 is kinda medium
f5.6 or worse is slow

The 17-85 is f4 @17mm and [email protected] But it does have (3-stop) IS. So...

It's actually not too bad as a low-light lens as long as your subject isn't moving. With any of the modern DSLR cameras that have excellent performance up to ISO800 you don't need to worry too much that it will be slow as an all-round lens. I used one for 3 years without many problems.
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Old Jul 6, 2008, 12:13 AM   #3
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I use the 17-85mm IS lens for most everything, it is a bit slow for indoors but the IS helps a lot. Works great indoors with a flash, I use580 EXII flash usually bounced off the celling.
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Old Jul 6, 2008, 7:20 AM   #4
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thanks for clearing that up for me guys
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