The lens works very good when you have good light. On lower light you'll see some of the sharpness fade, its good for bright light and can't beat the price of the L lens.

the image stabiliser is the reason I bought the zoom for wildlife,works a treat...

This is an excellent mid level zoom lens for the enthusiast or cash strapped semi-professional who needs a decent zoom lens. I bought mine through Amazon Warehouse Deals in Like New condition for about half price, so I did really well price wise.

The Canon 70-300mm zoom lens is a good lens. It works as it's advertised to. Canon quality can't be beat. It's light enough so you don't get tired carrying it around all day. I highly recommend it.

The worlds best 70-300. This lens is amazing and will not let you down. Perfect for full frame or crop sensor Canon DSLRs. Great focal range for field sports such as rugby, soccer etc. The AF and stabilizer are awesome.

I have used this lens extensively over the past several years with 5D2 and 5D3 bodies. I am always amazed of the speed to focus and the beautiful image quality. It is a class act and fully lives up to it "L" pedigree. The only very minor negative is its weight which is slightly heavy.

excellent image quality; fast focus on a 5D3; built like a tank

slightly heavy

I was looking for a lens that could take shots of wildlife from a distance. This lens certainly fits the bill and the IS helps in low light. I was also looking at the 100-400mm lens but the negative comments about its barrel focusing system pushed me towards this one.

Consistent Output; Durable; Easily Interchangeable; Fast / accurate auto-focus; Rugged; Strong Construction

Heavy; Poor in Low Light

I purchased this zoom lens from ZeeMo Digital at a very great price and it lived up to the expectations I envisioned.It was shipped out quickly and was also packaged nicely.

When I purchased my 7D, I also picked this lens up for some wildlife and nature photography. With the cropped sensor, 300mm is close enough for animals that don't want to eat you... I'm impressed. Images are pretty sharp and colorful.

Image stabilized; Superior build quality; Super-sharp images

Slow Auto-Focus

This is definitely a high quality lens, not as slow as it says on paper, image quality maintains high even at max zoom with lots of details. Unless you are shooting high speed events, I see no need for L lenses, this will work for me just fine, I mean, more than just fine!