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Old May 1, 2011, 1:06 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:
Shopping for lenses w/eye towards low light

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, 4:14 PM   #2
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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.

Imaging is all about light and your ability to sculpt it.
Equipment is just a secondary nuisance.

Last edited by PeterP; May 1, 2011 at 4:20 PM. Reason: Fix link
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