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Canon EF 17-40mm f/4L USM

ef17-40_4l_1_
Review Date: Dec 13, 2005 Recommend? yes | Price paid: $561.00 | Rating: 10 

 
Pros: sharp for the entire focal range at wide open
Cons:
my copy is softer at bottom right corner than bottom left...

Got it used locally, via eBay. Very sharp throughout 17-40mm F4. from 24-40mm range using Aperature priority, it utilizes faster shutter speed than the 24-105. F4 in the 24-40mm range is as sharp as my 24-105 at F5.6. However, I'm keeping the 24-105 as I'm hoping that 30D will be a 1.3x crop camera, which makes 17-40 less ideal of a walk-around lens than on a 1.6x crop.

 
Canon EF 24-105mm f/4L IS USM

24-105lisusm
Review Date: Dec 2, 2005 Recommend? yes | Price paid: $1,250.00 | Rating: 10 

 
Pros: quieter, faster AF than 17-85 it replaced, excellent build quality
Cons:
slight corner softness at wide-open even on APS-C sensor

For those complaining about price, considering IS lens generally cost $500 more than none-IS version, the price is not THAT bad.

As for the lens extension, hey, it's still shorter than 24-70 at 24mm, and lighter too.

However, even on APS-C senor at 24mm (x1.6) and F4.0, I notice some corner softness, which makes me think that it's not going to be pretty on a FF... maybe 1.3 crop would be best.

I'm glad to have upgraded from 17-85, and if I really need the F2.8, there's always the option of going through multiple copies of the Tameron 28-75 F2.8 for ~$400 until I find a good copy :-)