For starters, anybody who expects stellar optical performance from a 11,1 zoom, better stop reading right now. It is not going to happen, not with this one, nor with the Nikkor. I got this lens in a hurry, because I needed an all-purpose lens to cover a spur-of-the-moment client event.

? Solid build quality & finish; surprisingly good focus speed and accuracy; ? Overall pretty decent optical performance; except at the very long end (in my sample); ? Pretty unobtrusive internal focus; no rotating front-end.

? Chromatic aberration and purple fringing on highlight edges throughout the focal range, especially wide open; This can, however, be easily corrected in post or even in-camera (select Nikon models), ? Pronounced barrel distortions at the wide end, some pin cushion in the medium to long focal...

I do not have plans to complete a full Sigma 18-200mm f/3.5-6.3 DC OS Lens review. Hopefully the information and standard test result provided are helpful to you. Pictured below from left to right (ordered by extended size with lens hoods) are the: 1. Canon EF-S 18-55mm f/3.5-5.6 IS Kit Lens 2.

Sigma 18-200mm f/3.5-6.3 DC lens is one of Sigma's DC lenses specifically designed for APS-C type dSLR cameras and has a reduced imaging circle, which means it will not be usable on full-frame cameras (the lens will actually fit the full-frame camera, but will vignette heavily because of the smaller...

If you are on a budget and you are looking to add a new lens to your SLR

I have had this lens on my XTI for about 4 months. I am not sure about all the photo terminology, but I can tell you the following: If you are taking shots of people, MAKE SURE YOU HAVE A LOT OF LIGHT. Otherwise, the picture will not be sharp.

Zoom range

Difficult to obtain SHARP shots

Do a lot of outdoor activities and changing lens is a real pain. I bought this lens because in the midst of changing a lens I would often miss the shot. That's the real issue because getting the photo trumps the pixel perfect image quality. Sure spending $10000 on great lenses will get the quality.

Great all purpose lens

Not weatherproof

Great lens for weddings and group events. I also use a Nikon 80-400 VR, so with this new Sigma 17-70mm OS I can cover most situations.

Consistent Output; Durable; Easily Interchangeable; Fast / accurate auto-focus; Lens lock 2 prevent creep; Multi-purpose; Nice Bokeh; Rugged; Strong Construction

Yes, I would recommend this to a friend

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

Poor in Low Light

An all-in-one superzoom lens with optical stabilisation for APS-C digital SLRs which prides a range equivalent to 27-300mm on a 35mm camera.

High zoom range; Decent sharpness at shorter focal lengths; Highly effective optical stabiliser; Price

Falloff in sharpness at 200mm; CA towards edges can be noticeable along high contrast edges; Slow AF at telephoto end

A great lens which has taken so many good photos for me, I would certainly recommend this lens

cheaper than official Canon; sturdy; reliable; great zoom range; fairly good focusing; great picture

lens creep; a bit heavy; could possibly be built with better f stop