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Cons: Barrel Lock unreliable ,finish marks easily

Pros: Price,tracks well,good package of extras

Summary: Best for price,works well in low light,just bump the ISO

Cons: Difficult to take sharp hand held images due to weight. It is advisable to use bean bag or tripod to get sharp results. Focusing hunts when try to focus from Minimum focus to Infinity when shooting flying object.

Pros: Good Image Quality up to 400 mm focal length and at F/8. At 500 mm focal legth need to stop down to F/11 to get decently sharp images. Build quality is very good. Best lens at this price tag & ideal for wild life & birds photography.

Summary: At this price tag, best lens in the market to reach 500 mm focal length. Very good image quality up to 400 mm focal length.

Cons: none

Pros: nice solid feel, good optics.

Summary: bought used in mint condition. this is not as sharp as my 400 f5.6 canon L wide open but if you shoot at f 8 you can't tell the difference. I like the zoom from 150 to 500 and the extra reach compared to my canon 400 f 5.6 L. Very happy with Sigma quality.

Cons: How to use this lens?

Pros: How to use this lens?

Summary: How to use this lens?

Cons: weight

Pros: good range. my copy is sharp wide open at 500mm

Summary: Love it

Cons: Impresive up to 400mm gets a little weak after this OS works well. If you stop down at 500mm just stop down one stop helps with the sharpness. If thats a problem with a Digital SLR just increase the ISO used on 50D body

Pros: Heavy not as fast as the canon 100-400 F4L lens. The material marks easily

Summary: Good range but slow low chromatic aberation excelent value for money

Cons: The lock is not worth well When attach on my monopod when transporting it on my shoulder sometimes they unlock and open full at 500mm

Pros: For the price it's a really good value when you want a big zoom for zoo animals , birds photography, and sports like tennis, hockey etc... it's come with all acessoiries ...sun hood, bag,strap, collar. OS ...work well.

Summary: Recommanded if you can't afford a Canon or Nikon lens $$$$ Keep a good value for many years if you decide to upgrade for a pro lens.

Cons: - Not as well build as the EX models - It's very heavy (but that is to be expected) - Max. aperture at 500mm is 6.3 which could influence AF on some (older) bodies - Tripod collar can only be removed when lens is not fitted to a camera

Pros: - It is well build (although not up to EX standards) - Complete packadge including sturdy carry box and strap - Very good optics, very sharp when stopped down to F8 or F9 - Fast and very accurate HSM AF (no micro AF adjustment needed) - OS very effective, high keeper rate even at 1/60th at 500mm - Very hood value for money and at least 2 years warranty

Summary: I bought this lens for photographing birds as my 70-200 + 1.4x is to short. I was divided between the Canon 300 F4, the Canon 100-400 IS and this one. I still found the 300 to short and the test record of the 100-400 is not that great (a good one is very good but hard to find) I was very pleasantly suprised by the quality of this optics. The lens is sharp wide open but as soon as you stop down to F8 or F9 contrast and sharpness ar very very good. AF is very fast and very precise and focusing of small birds between branches or grass is very easy, This is 1 of 2 lenses I own that did not need micro af adjustment. OS works also very well with high keeperrate at 1/60th or even slower and being able to shoot handheld at 500mm is very welcome. Ofcourse it is heavy (3KG with camera and grip) but with the supplied neckstrap is is quite comfotable to walk around with. I did spent many hours carrying it that way without musclepain. I also had the opertunity to compare it with the old 170-500 and that is no comparison. This lens is in all regards in a huge step up. Value for money is also outstanding. Only whish I have is that it would be a dedicated EX lens which are even beter build (it is good though)