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Cons: A poor lens for manual focus because: a. You have engage manual with lens clutch AND camera b. Manual focus is much too sensitive (small travel) for focus with any accuracy AF does not work properly in Live View.

Pros: Fantastic IQ even wide open - to my surprise its as sharp as my primes. On Pentax viewfinder (PD) AF is fast and accurate. Build pretty good (but not Limited lens quality). Quite a reasonable weight for a lens in this class

Summary: Apart from manual focus (see Cons) I love this lens. It stacks up incredibly well against my primes. It seems like a marriage made in heaven for Pentax bodies where AF is fast and accurate (possibly more powerful AF motor?). However a quirk for many Pentax copies is that AF does not always work in Live View which does not worry me given that PD works so well.

Cons: Autofocus: This lens have poor AF. Forget weddings or sports. Clutch Pull mechanism will throw your composition off when mounted on a tripod. Build Quality: Well buillt but I killed the already slow AF system and craked the front element. Image Stabalization: This system is useful on this focal length which isn't on here.

Pros: Vallue: This was what I could afford at the time and gave me beautiful images. Optical Quality: This lens produce beautiful image quality wide open.

Summary: Great lens for anyone shooting in a studio who want great image quality for cheap. The resolution on this lens is outstanding for what your paying. Great for portrait photography and lighter than the other 70-200 focal lengths.

Cons: Nervous bokeh, heinous mechanical vignetting on FX. Heavy and not so confortable to take for a long time (but this is a common issue of 70-200 2.8 lenses, anyway..) Poor AF performance in low-light scenarios. Lack of stabilization.

Pros: Excellent sharpness at f/2.8 from 70 to 135mm, excellent sharpness on all focal range at f/4. Surprisingly good construction for the price paid.

Summary: Good lens for newbies who want approach 70-200 2.8 lenses, but it's performance is far from genuine Canon-Nikon lenses.

Cons: Low-light performance is not always on par with some of its competitors such as the Sony G lens.

Pros: Excellent value for money. The lens is sharp across a wide range - from f3.5 to f18, with its best performance on both SLT A-77 and A-580 at f8 to f11. It also works very nicely when used in a manual focus configuration.

Summary: Highly recommended - and by comparison to the Sony G lens, much better value for money. Very rigid construction and almost 0 barrel distortion. Gives excellent results with almost any filter system ( I use Lee).

Cons: Nervous bokeh from 135 to 200mm, AF tends to be slower and/or inaccurate in low light scenes, vignetting at 200mm f/2.8

Pros: nice construction, fantastic Q/P ratio, excellent resolution at f/2.8 in 70-135mm range. It's recommendend to stop at f/4 when using at 200mm.

Summary: Full frame camera Nikon D700

Cons: Some kind of AF slower...

Pros: Price, optics

Summary: I think this is a big lense for the price...2,8...70-200 and just like i use the sony A77 a can't use the 1,4 and 2 magnify...to get...600mm

Cons: slow AF unless in bright light. a little noisy too. AF is hunting in low light

Pros: excellent IQ with pro results. solid build quality even w/out sealing.

Summary: bad for fast moving subjects. excellent for portraits.

Cons: Slow & Noisy AF, hunting AF, AF is a pain in the neck from moderate to low light.

Pros: sharp throughout the focal length from f4 and f5.6. decent macro capability. good built quality. nice bokeh. low distortion.

Summary: excellent for portrait, bad for sports or fast moving subjects due to the slow AF. a good rival for canon 70-200 L lenses in term of sharpness.

Cons: sometimes hunts for focus

Pros: Harp from center to edges

Summary: I made the right buy. Very pleased with this lens

Cons: Noisy AF, sometimes annoying AF "hunting", not tack sharp @ 200/2.8.

Pros: Great optical quality from 70-180mm, feels well built, not as heavy as competitors, decent macro capabilities

Summary: For everyone who can't afford the nikkor 70-200/2.8 VR or canon 70-200/2.8, this is your lens. Yes, the AF isn't the fastest, but this only matters in weak light when it can't lock on and hunts through the focus range. I've shot dogs and horses in motion and the servo AF is fast enough for that :)

Cons: Focus hunting is annoying; but very easy to put into manual without taking your eye off the subject. Slight non-repeatability of aperture at high settings (f11 and up, 2 to 5 percent variation noticed frame to frame) which can complicate multi-shot segmented panoramas -- you just need to tweak the results OR use low aperture for better exposure repeatability.

Pros: Excellent image quality on par with my Nikon 24-70mm f2.8, almost perfect image illumination with slight falloff wide open and wide angle (about 10 percent darkening). Beautiful bokeh; makes fabulous portraits. Corner illumination seems to actually be better than the Nikkor 70-200 f2.8.

Summary: A delightful lens and the one I use most commonly after my Nikkor 24-70ff f2.8

Cons: AF for moving sibject is a hit or miss...; no sealings against dust

Pros: excellent image quality even on max aparture; very good quality around minimum focus distance (0,95m!!!); focus distance;

Summary: AF speed and sound is OK for me, not loud at all, but louder than USM etc... AF for static subject is precise, far better than Sigma i owned, very usable portrait lens IMHO... using it on D700

Cons: slow and a bit noisy AF. lack of image stabilizer for low light and not moving subject photographing.

Pros: excellent photos quality. sharp and contrast.

Summary: AF is not as slow as snail. able to track subject movement. not as noisy as many do complain. paying at low price for new, i do not expect it to perform like EF70-200mm f/2.8 or AFS70-200mm f/2.8. but it does perform to the photo quality of the both. if you are professional sports photographer, you able to get the EF or AFS lens. other consider-to-buy 70-200mm f/2.8 lens, this the lens for you.