This lens is simply great. The only concern I had about it was the sharpness in the corners but being a landscape photographer and shooting mostly at F8 and up, I don't have a single complaint. The zoom range is great, colours are fantastic and build quality is, well it is an L lens!

I'm still learning how to use it, but thus far this lens way out does the lens that comes with the body. High quality pictures with exceptional captures.

Very sharp, found it to be much sharper and more accurate than my 24-70 2.8L, however when open wide at 17mm, there is some considerable distortion to watch out for especially with portraits. Photoshop's lens corrector tool should be able to help with that though.

The Canon EF 17-40mm f/4L USM lens is an inexpensive alternative to the 16-35mm f/2.8, but its edges are muddy at its widest angle. (3 out of 5) Pros Ultra-wide field of view Reasonable price tag Good center sharpness Cons Muddy edges and corners at 17mm Some distortion Noticeable color fringing The...

Ultra-wide field of view; Reasonable price tag; Good center sharpness

Muddy edges and corners at 17mm; Some distortion; Noticeable color fringing

Pros: Lightweight, Fast / accurate auto-focus, Easily Interchangeable Cons: Other thoughts: Great for landscapes, sunrises, and sunsets - particularly in combination with graduated neutral density filters to balance exposure of land and sky. Amazing for indoor room photos - a must for any Realtor.

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Bought this lens to round out my lenses for Landscape photography. Took it on a recent trip to shoot waterfalls at a local state park, did a great job. Sharp, vibrant pics - very satisfied!

This lens has been my favorite lens for over a year now, being equivalent to a 27-64mm it falls into the perfect standard zoom range.

Compact; Build quality

I loved he price I got this lens for and the quality is very nice, I am happy to have got it from homeshop and the lens can focus to a very close object also.

Paired this lens with Canon 6D. Sitting on on tripod, stopped down for real estate photography, no IS required. Images are sharp. I use OEM software to correct for distortion and lens optimization. I'm very pleased with the purchase. Canon L glass, at this price, recommends itself .

Canon glass with Canon DSLR equals peace of mind about compatibility

F4 not really fast enough in low light situations without IS