I was looking for a lens with a slightly more reach than the stock 18-55mm that came with the T5i; I mainly was looking for a nice walk-about lens that could handle the majority of situations.

I purchased this lens 4 years ago, when I first got started on DSLR photography. At the time I did not fully appreciate the lenses options and abilities. Now that I am more experienced all I can say is that this lens provides overall excellent image quali

Nice and sharp wide open at all focul lengths. IS works great. No problem for sharp pics at 1/13 a sec at 34mm on 7D.Mine is almost as sharp wide open as it is at F8. No decentering at all.

Lightweight; Durable; Fast / accurate auto-focus; Consistent Output

Pricey

This lens spends the most time on my 70D due to its versatility and overall IQ. I got the 18-135 STM with the 70D but subjectively I think this lens produces better quality. I take this, the 10-22, and 70-200 f/4L IS (and 1.4x TC) in my bag to cover the gamut of focal lengths I'm most interested in...

I've had the lens for 3 weeks and run a few tests. I've determined that the lens doesn't perform any better in low light then the Canon 18-135mm. In normal light the photos are sharper but the difference wasn't as significant as I expected when viewed at less then 100%.

Durable; Easily Interchangeable; Full Time Manual Focus; Nice Bokeh; Strong Construction

Poor in Low Light

Developed to fit the requirements of advanced amateurs, this new standard lens is an excellent all-round performer, featuring high-grade external finishings. Its 5.7x zoom range (24-135mm equivalent in 35mm format) covers wide angle to telephoto, and a host of high-end features that deliver great...

The lens appears brand new and I assume it is, but it was not in Canon packaging, so appears to be a 'gray-market' lens. That also accounts for why its price was significantly less than is commonly listed for this lens.

I bought this lens to replace the kit lens that came with my camera. It provides consistently sharp images. It focuses quietly and quickly. While it is somewhat heavy, it is well worth the trade off for the images it captures.

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

Heavy

Bought this to replace my 18-55mm kit lens for my canon 550d... awesome diwali offer from flipkart and got it at 12000 rs off for 46k. This is a near L quality carry around lens for canon crop sensors, covers a good range even at the wider end, awesome focussing with USM motor and ful time manual...

I purchased the T3i with the standard 18-55 mm lens. After using the kit lens, it was decided that a higher quality lens was needed. Purchased the 15-85 mm and the difference is like night and day.