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  Reviews by: ingveld  

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Canon EF 17-40mm f/4L USM

Review Date: Aug 12, 2008 Recommend? yes | Price paid: $780.00 | Rating: 10 

Pros: Low price, super sharp, great focus, short minimal focusing length, ability to use filters in front of lens
the smallest aperture is 22 – the perfect lens would have 32 or less :)

No lens is absolutely perfect. For landscapes this one gets as close to it as canon gets. Normally you would prefer primes over a zoom but I keep this one on most of the time while shooting landscapes.

Having said that I find it very obvious that this lens is NOT a portrait lens – for that the aperture is not nearly wide enough. If you are looking for a super wide zoom lens for portrait go for the 16-35 2.8. If not its a waste of money.

Stopped down this lens is shaper than the 16-35 as you can see on the MTF charts.
You can put 77mm filters in front of the lens, which the 12-24 Sigma doesn´t offer.

I use it on a 5d and in the corners I a sometimes amazed by its sharpness. Some photos I have taken with this lens:

MTF for sharpness: