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Cons: The F that start in 4.5 in 120 and ends in 5.6 Its a little soft in the range of 350 to 400mm

Pros: Very very good build quality The OS works perfect Opticaly from 120 to 300mm its very similar to a canon f4 L lenses The tripod ring have god desing

Summary: Its to short the market options to get a 400mm lens with good qualitiy and good performance,with a competitive price, this lens is the best choise to benefits/costs.

Cons: The following probably regard solely my sample as they don't coincide with what i have been reading about this lens. 1 Has a profound backfocus. 2. Sharpest apertures f/11-16 instead of f/8. 3. f/5.6 pictures are unusable. Exceeding the description of soft and described rather as blurry or out of focus. I also don't agree with the total matt finish : it's too delicate. Something like the Tokina AT-X Pro series finish would be way much more better choice in many aspects.

Pros: OS works well. Build quality.

Summary: Rather dissapointed with my sample. Too many issues gathered in a single piece. Currently investigating with local sigma authorized service what my options are. If this direction wont fix the issues, i am then replacing it with something else ASAP. The lens appears to have good sharpness potential WHEN i managed to get accurate focus ONLY MANUALLY and only at the sharpest aperture of f/13. So i guess the copies without the whatever problem is with my copy that produces around 2cm back-focus in close focus distance and unusable f/5.6 IQ - sharp peak @ f/11-f/16 should be indeed considered a very decent 400 zoom solution. I have seen acceptable - good (sharpness) pictures even @ f/5.6 from other users.

Cons: Heavy

Pros: result usable

Summary: in general this is a swell lens

Cons: A Canon 70-200 L it is not

Pros: Good OS Nice Zoom and Manual Focus Rings

Summary: Overall a great lens for the money but for considersbly less you can purchase a Fuji HS10/20 with 24-740mm zoom that produces remarkable results and is just a percentage of the weight

Cons: not actually a dream lens when it comes to size and weight ;)

Pros: very good OS, may very well be the best performing tele-lens in its price range, the IQ is actually better then expected, very nice MF control, feels very well made and smooth

Summary: a bargain lens for what it does.

Cons: Sharpness of lens at 400mm Cannot use OS when on tripod

Pros: Can manually override autofocus Very comfortable to use No moving parts when focusing so use on beanbag

Summary: Excellent lens if a bit heavy. Excellent features for price with HSM and OS. Less sharp at full telephoto. Very good value for money - but the best costs more.

Cons: Images often need sharpening in post processing but respond to same very easily. Much of this may be due to the haze which is often present for distant subjects Needs faster apertures to allow higher shutter speeds

Pros: Optical stabilisation appears to work very well Satisfactory sharpness No intrusive geometric errors or field use issues to speak of Good solid feel. Nice smooth operation.

Summary: Not as fast or as sharp as one might have wanted but then it was very reasonably priced. It appears very well built and operates very smoothly. Good (if not brilliant) consistent results - no real optical vices. Good stablisation and feels well balanced in use.