This easily is one of the best Lens I have owned. One of its kind. The 'L' says it all. Amazing performance in the day light condition and equally great performance at low light mode. Looking at the images, you will never be able to tell that 'IS' is missing. Crisp and sharp images.

I love this camera... I take railroad photographs and it is awesome. Wish it had more mm, but for the price it is plenty. Photos are amazingly sharp, even with the 1.4x extender. Focus is fast and silent.

Consistent Output; Durable; Easily Interchangeable; Quick Focus; Rugged; Sharp Focus; Strong Construction

Heavy; Scratches Easily

Marketing our Egyptian Arabian horses depends first on eye catching photography. So I need moving & posing shots. I was greatly impressed with the extreme fast focus & rapid shots I got. (Horses never stand still for very long.) I didn't know my Canon 20D could fire shots this fast!

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

This product is simply amazing..It has a huge difference compare to EF 70-300 and im not talking about the EF 75-300. It gives you a high image quality especially sharpness and versatility. The structure is stunning and I would recommend this to everyone. Source: From experience.

Great for shooting my son's flag football games!

Awesome Low Light Lens; Consistent Output; Fast / accurate auto-focus; Strong Construction

Pros: Strong Construction, Nice Bokeh, Fast / accurate auto-focus, Durable, Lightweight Cons: Other thoughts: On time with overnight delivery and the IQ is amazing. Thank you guys.

I am very pleased with this lens.I'm not a professional, just someone who enjoys taking photos and using Photoshop Elements/Premiere to do some creative things for digital photo albums, etc.

Fair Pricequality Lens

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I purchased this lens for my 700D after reading multiple reviews and researching various lenses. This is my first L lens and I am very pleased with the pictures and the way the lens handles.

Fast auto-focus; Great Value; Lightweight; Superior build quality; Super-sharp images

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I have been using DLSRs for quite some time and moved to full-frame camera a while ago. Having used many lenses from every stable including Canon, Nikon, Sigma, Tamron, Tokina & Samyang and almost every focal length (right from 10mm to 400 mm), I must say this lens is easily one of the best...

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

The Canon telephoto delivers fabulous image quality through its zoom range, along with the some of the best lab scores for sharpness for a lens of this type.

Sharpness across the zoom range; weather sealing; autofocus speed

Good but not great for chromatic aberration