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Old May 1, 2011, 2:06 PM   #1
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Default Ultrasonic EF 17-40mm 1:4L vs EF 17-40mm f/4L

I am in a similar situation as this poster:
http://forums.steves-digicams.com/ca...low-light.html

Shooting in low light in clubs and bars. I already have a 50mm lens, but if it is crowded, I have to either try and shoot between, above or below bodies, or if I am right up to the stage, I am too close.

I also have the 18 - 135mm lens that came with the T2i, but it is usually too slow to use w/out a flash.

Last fall a friend lent me a 50D with a 17-40mm lens on it at a club and I was happy with the results. Then about a month ago, I got to try a EF 17-40mm 1:4L, but not under the normal conditions I would use it for. The owner highly recommended it for what I do. Anyway, when I do a search online for "Ultrasonic EF 17-40mm 1:4L", I get a few hits, but mostly they are for the "EF 17-40mm f/4L".

Is this the same lens? And is there a comparable lens made by another manufacturer for less?
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Old May 1, 2011, 5:14 PM   #2
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Default

f/4 and 1:4 is the same thing.
It is a descriptor of the ratio focal length to the maximum diaphragm opening.

Canon makes a faster lens for low light the 16-35 f/2.8 L it only costs about double the 17-40 f/4 L

Other brands YES,
Sigma makes a very nice one a stabilized 17-50 f/2.8 about the same cost as the 17-40 f/4.
And it is stabilized neither of Canons offerings are.

However the Sigma is only for crop sensor bodies, the Canon ones are both for full frame pro bodies.
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Last edited by PeterP; May 1, 2011 at 5:20 PM. Reason: Fix link
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