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Canon EF 17-40mm f/4L USM

ef17-40_4l_1_
Review Date: Apr 29, 2006 Recommend? yes | Price paid: $799.00 | Rating: 8 

 
Pros: 40 mm max, good macro
Cons:
price price price!

I tested this lens vs the Tamron 17 to 35mm lens and the image quality is identical. Both lenses were flat from the center to the edges of the frame. I was FF using a Canon 5D. I made resolution targets at every f/# at 17mm and 35mm and the two lens were within one chart. Since price is an issue with me I almost decided to go with the Tamron mainly because it had 2.8 F/# on the 17mm end and f/32 on the 35mm end where the Canon is f/4 to 22 straight across. But the Canon focused faster and the 40 mm high side gave bigger macros. The only non- flat resolution was with the Tamron in the center at 17mm it started out at 0 1 at f/2.8 maxed at 0 4 at f/8 and dropped to 0 2 at f/22. The Canon was 03 from end to end all aperatures. I wasn't going to weld the aperature at f/8.

I rationalized I would buy the Canon 17-40 because the max focal length was 40mm and this would keep me from buying an intermediate lens. rather I will just get a 70 to 200mm to complete my travel backpack. O someday I will get a 50 or something else. I was tempted with the Canon 24 to 105mm w iS but my tests showed the copy I had was too soft. Not worth the price.