The Sigma 150-500mm f5-6.3 DG OS HSM superzoom has the most important aspect of any modern long-focus lens – an efficient AF drive system. This is very much the Sigma superzoom's forte.

Impressively quick and quiet automatic-focusing

Significant softness at wide aperture

After one week with the Sigma 150-500mm OS, even with the smaller aperture range of f5 to 6.3, this lens exceeds my expectations. In fact, it gave me such good results that I put my 100-400mm IS L Canon up for sale.

Good reach; quiet focus; manual override; works well with extenders

Can focus hunt; OS makes some noise; Canon 40D has reported problems with lens

I've tested this lens on my D60 and it is really very good. I'"m planning to buy this as a walk-about tele lens in place of my 55-200 nikkor VR that I'm using with a teleconvertor. (Wont need a tele on this!

super tele range

Costlier than 170-500; Too slow for night

Bought this lens after considering many others, took some time to sort out the best settings and how to use it handheld.I was very pleased at the results.See some of my pics ive included.

good quality sharp pictures hand held for an affordable price

A little cumbersome

There are not many choices in the market for 500 mm lens. All but a few are prime. This lens offers the convenience of zoom lens with focal length varying from 150 to 500 mm. Its image quality is excellent from 150 to 300 mm but gradually degrades toward the 500 mm end.

HSM; OS; well built and relatively inexpensive 500mm lens

Slightly worse image quality above 400mm; OS needs about one-second to engage, not immediately effective

There are not many choices in the market for 500 mm lens. All but a few are prime. This lens offers the convenience of zoom lens with focal length varying from 150 to 500 mm. Its image quality is excellent from 150 to 300 mm but gradually degrades toward the 500 mm end.

HSM; OS; well built and relatively inexpensive 500mm lens

Slightly worse image quality above 400mm; OS needs about one-second to engage, not immediately effective

Sigma's APO 150-500mm F5-6.3 DG OS HSM lens is a telephoto zoom with a 3.3x magnification ratio that will suit photographers who enjoy taking close-ups of sports or wildlife. Although not particularly fast, it is reasonably portable and has an affordable price tag for its build quality and optical...