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.

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!

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

Using a test chart, I found the lens to be very sharp across the image at all focal lengths. The included picture is typical of my results and is a small part of the image from a Canon 5D Mark-II.

The lens quickly snaps into focus and produces good closeups at the 40 mm setting.

Fast / accurate auto-focus; Lightweight; Sharp at all focal length

Barrel distortion

I use this lens for shooting abandoned buildings, so I can more get the scope of the place I'm shooting. THe only thing to keep in mind is that this lens is an f4, so there are some speed and low light issues, but if you're using strobes then it's not a problem.

Strong Construction

Poor in Low Light

It is use in 600d

Well worth the money compared to McBain's pricing,!!!

Smooth operation, and a great upgrade for the standard lens provided with the T3I Canon; Great clarity

A little tilt on the vertical structures; but acceptable

I love this lens. Nice color reproduction and fast focusing. Gave me great results in my last outdoor photo shoots!!

Consistent Output; Fast / accurate auto-focus; Nice Bokeh; Strong Construction