Epinions doesn't allow embedded photos, which is a shame for camera/lens reviews where the photo is

Small, compact; Good optics for such a wide range

Soft corners at 18mm wide open; Canon version must be focused parfocally above 135mm

Great lens, focus and aim is great. A little noisy at times & doesn't perform well in the heat struggles to focus a bit but nothing a little flick off of the power button can't handle. Good quality well made and has taken some amazing pictures at close and long range

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

Sigma's long-awaited, second Optical Stabilizer (OS) lens ($549, street) is an 11.1X digital-only superzoom with one SLD and three aspheric elements. A 29-320mm equivalent, it follows Sigma's first OS lens, an 80-400mm f/4.5-5.6 ($999, street), by more than four years, and outdoes its predecessor...

The Superzoom category of interchangeable lenses is becoming one of the most hotly contested areas of technology in the digital age and virtually everyone is trying to get in on the act. The Sigma 18-200mm is the latest to reach the dealers' showcases.

Good stabilisation system; Good build quality; Decent optical performance for type; Reasonably price

The negative points are; Heavier than some; Some CA around the edges at wider apertures; Barrel distortion at the wide end

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...

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.

Although Sigma released their first lens with a built-in Optical Stabilizer (OS) system in the spring of 2004, the company employed this technology in only one pro-grade lens, the 80-400mm f/4.5-5.6. That has changed with the introduction of a more compact/affordable (digital-only) 18-200mm OS zoom.

Huge 11x focal length range, ideal general purpose and travel lens ; Relatively low chromatic aberration; Low distortion (for a superzoom); Reasonably effective optical stabilization system, 2.5 - 3 stops benefit;

Very inconsistent sharpness through the zoom range - extremely soft at 80mm; Soft corners at all focal lengths; Occasionally indecisive autofocus; Slightly less resistant to flare than its more recent competitors;