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Canon EF 24-105mm f/4L IS USM

Review Date: Feb 3, 2006 Recommend? yes | Price paid: Not Indicated | Rating: 7 

Pros: Range, build qualty, optical quality, handling.
Size and weight, price, vignetting at certain combinations of focal length and aperture.

Previous posters have mentioned that this lens vignettes when used on a 5D, and they are correct--when used at wide angles and large apertures, it can get bad. However, even under the worst cases, it is easily fixable in PS with about 30 seconds of work. Also, it disappears pretty quickly when stopped down or zoomed out. For me this drawback is easily outweighed by the optical performance at other focal lengths and apertures; this is a very nice lens with a great range. After a few hundred shots, the vignetting actually got visible in one shot. So in real life, it's not a problem (for me). While optical quality and build quality are simply wonderful, size and weight and price aren't. This is a big lens, and pretty heavy, too. The supplied hood isn't much good, either. Designed to prevent cutoff at 24mm, it doesn't offer much shading at other focal lengths, so I usually leave it at home. On a 5D, the lens balances very nicely, the zoom ring is in the right spot, and it makes a real nice package. And then there's the price; I'd rate it higher if it cost a little less.

Canon EF-S 17-85mm f4-5.6 IS USM

Review Date: Jun 28, 2005 Recommend? yes | Price paid: $599.00 | Rating: 8 

Pros: Range, size and weight, IS, sharpness, color fidelity.

After reading the many reviews, I tried this lens as a walk-around solution, and it's a wonderful lens. I've printed shots from this lens up to 13" x 19", and they look very nice, and compare very well with the 17-40. The AF is quick and silent, the IS works as you'd think, and the range is near perfect for a single-lens solution. My only complaint is price; it is expensive, but so far has no real competition (a walk-around with IS). I certainly don't regret purchasing this lens.