LensTip.com

Cons: No VR

Pros: Image quality much better when compared to 70-300 lens

Summary: Very good lens

Cons: some Ca's on 300 mm and a few less sharp

Pros: stopped down to f 8-11 really very sharp on 100-250mm, to use with converter, high contrast nice colors

Summary: very good lens with some weakness on high focus end

Cons:  very uneven sharpness across the (FF) frame  high CA and color fringing in the corners  high degradation in the corners of the frame  very heavy comparably  high price tag and enormous price decrease for used lenses - hard to sell used for an adequate price  bad centering and degradation of quality over time though used was normal

Pros: as with many Sigma lenses - it looks good on paper. A 100-300 mm lens with a reasonably good constant aperture - who wold't want to buy it? The reality is unfortunately that it is at best a mediocre lens and the quality control of Sigma seems to be sub prime - at least that time when this lens was in manufacturing

Summary: relatively good lens from 100-200 mm - heavy degradation at 300 mm and wide open. Easily beaten by the Canon 70-200 f/4.0 L IS USM which is also only half the weight. I'd not recommend to buy this lens knowing the quality of the Canon 70-200 - even if you crop the 70-200 at 200 mm to meet the FOV of the 100-300 at 300 mm you get much better image quality - which seems to be a no brainer to use the lighter lens - which I do now.

Cons: I got better images with Canon 100-400 EF

Pros: Fairly simple to use

Summary: I rented it but was disappointed overall. Just wasn't a good experience

Cons: weight and size lack of image stabilization

Pros: great image quality, especially on DX great reach on DX combined with the large aperture

Summary: I really like it. It is perfect for birds or planes as well as for landscape. I wish it had image stabilization.

Cons: filter size, build like a tank

Pros: Sharp in every situation, fast, silent, works perfect with sigma 1.4 converter, build like a tank

Summary: one of my best lens

Cons: No

Pros: Excellent image quality 100-300 at every aperture. Fast focus, good tripod mount.

Summary: Exellent lens. Works good with sigma apo 1,4X converter.

Cons: - lacks image stabilization - rather big, heavy, draws attention

Pros: - Excellent image quality, particularly at 100-200 mm, even wide-open - Very good image quality at 300 mm, even wide-open - EX finish - Comes with a pouch, a tripod mount and a lens hood - Internal focusing and zooming - Decent, constant aperture of F/4 - HSM - Works OK with Canon's x1,4 converter ( I don't recommend kenko or sigma though )

Summary: Looking for a telephoto lens, I faced the common dilemma of choosing between Canon 70-200/4 L and Canon 70-300 F/4-5.6 IS. I really needed the 300 mm but I felt the 70-300 was not good enough. Then I found the sigma. For me, it is the longer version of 70-200 L. It is one of the best lenses Sigma ever made and it really can be called an L's match. I'm very satisfied with the lens. It's sharp wide-open, it has a fast AF motor, it's sturdy, the front element doesn't rotate. It works with a converter. The only drawbacks I can think are the lack of image stabilization and the dimensions of the barrel. It's pretty heavy and it draws a bit too much attention (at least it's not white). It is,however, expected of a lens this long and fast. Would I buy 400/5.6 L or 300/4 IS L instead? I guess not. First of all, they are (or were, at the time I purchased my sigma) more expensive. They're also less versatile. I must, however, admit that the images produced by them are better than what is offered by Sigma.