I use this little gem of a lens whenever I travel. Like all super zooms, it has compromises, but the main one of reduced apertures, is compensated for by the high ISO capability of modern cameras. The longest focal length is also very useful for nature and macro shots.

Light; compact; sharp; fast focus; very usable focal range

No full-time manual focus; though I seldom use this on other lenses

I'm very sorry but this lens is terrible. The sharpness was horrific especially at each end of zooming but macro and extended top 250. Maybe because I'm using a very new Canon (T7i) but this did not produce good images. Perhaps mine got damaged but I kind of doubt that it was broken.

TSC, which is incorporated into the lens barrel and is often compared to polycarbonate, has a high degree of elasticity and exhibits little variation in its structure in extreme temperature conditions.

I use this lens on my Sony A 77 II,It has been a pleasant surprise how light and easy to use

Had some pleasing results on an old EOS 350 and new 1300. Very useful zoom range and saves on lens swaps for most general situations. Build quality seems OK. The lock function is required as will creep when carried without it on - no real problem and expect really with it's impressive range.

Since this is an all rounder lens, don't expect the sharpness of a prime lens. It works good, but care has to be taken to click without chromatic aberration. Not as sharp as Nikkor but that is not gonna be a real issue.

Sigma introduced this lens in 2009, as an upgrade to its 18-200mm lens. The lens comes in Sigma, Canon, Nikon, and Pentax mounts, and it includes optical stabilization (as denoted by the "OS" in the lens' title).

I brought this lens to use as an all in one on holiday because I did not want to be laden with all different lenses, the only other one I took was a wide angle for special land scape and night images or though the 18-250 would have worked too but just needed to take that one other special lens.

Lightweight; Quick Focus; Sharp Focus; Strong Construction

I really, really, really wanted to love this lens. I did a lot of research on my options in this pirce range and the fact it is built is Japan was a major selling point.THE GOOD: Well built with a sharp and clear visual through my DSLR. Operated smoothly and had a feel and look of quality.

Durable; Easily Interchangeable; Lightweight; Strong Construction

Color Not Quite Accurate; Color Was Not As Good As; Inconsistent Focus Issues

Very quality lens, half the price of the similar nikon model. Very good sharpness at F8-F11, at almost all focal lengths. Small and light, OS is working well. Compatibility problems with the new nikon bodies.

Sharp!; Good close up; OS working well; light and small; price

Compatibility problems; creep when unlocked