Nature photographer Ross Hoddinott puts Sigma's 120-400mm zoom to the test and is impressed by its versatility Sigma announced its 120-400mm lens in January 2008, along with the 150-500mm f/5-6.3.

I had read mixed reviews on this lens and wasn't sure if it would be the best choice for my needs. I do mostly wildlife photography and needed a long reach lens. After driving myself crazy, I finally chose to buy it over the more expensive Canon 100-400 IS. I was amazed for so many reasons.

Very well balanced; excellent IQ; positioning of the manual ring and zoom ring

A bit heavy; but not much different than others in this class

Super tele lenses (400mm+) tend to be rather expensive being and as such often limited to professional use. However, there're a few lenses where the manufacturers were able to keep a rather moderate price level and the Sigma AF 120-400mm F4.5-5.6 DG HSM APO OS is surely among to more popular options...

I do not currently plan to create a full text review for the Sigma 120-400mm f/4.5-5.6 DG OS HSM Lens, but the full array of standardized tests are available for your own evaluation and comparison with similar lenses.

A definite step up from Canon 70-300 IS USM only if you are comfortable with the two extra pounds. If you don't have at least a good monopod, you will need one. I can, however, get useable hand held shots at 120th of a second at 400mm with optical stabilization on.

BEAUTIFUL LENSE, WORKS PERFECT FROM 300MM AND BELOW A LITTLE SOFT FROM 300-400 .. FAST AUTO FOCUS EXTREMELY SHARP, A BIT HEAVY, BUT IST A BIG LENSE (EXPECTED) ZOOM RING IS KIND OF HARD WHEN ZOOMING OUT( COMPARED TO NIKON LENSES)..

I have owned this lens for about a year now. I am very pleased with the images I get from it. I have found it hunts whilst focusing in grass or trees. I tend to use manual focus 10% of the time because of this slight problem. I would not say it is a fault.

Yet another awesome lens by Sigma! I have yet to try it out outdoors but my tests from indoors are very promising! As always, Walmart has the best prices and service!!

I bought this lens for outdoor sports photography with my Nikon D7000 (The seller changed over the attachment to a Nikon one). Brilliant lens. The price is phenomenal compared to canon or nikon branded lenses of the same calibre.

After reading many, many reviews of the Sigma 120-400mm lens and the Canon alternative, 100-400mm and taking into consideration the cost, I decided on the Sigma lens. If I was wealthier, or a professional, my decision may have gone the other way.

Durable; Easily Interchangeable; Strong Construction

Heavy