High-quality telephoto lenses for DSLRs are tricky to buy. They're a huge investment, with prices starting at around £1,500 and heading sharply skywards. There are also considerable usability problems: long focal lengths require fast shutter speeds, which require large apertures, which all results...

Bought this lens after long consideration and after testing a used non OS version. Very pleasent surprise after testing on birds and wildlife. Have a supersharp Canon 100-400 but need more reach and better F plus full AF which is imposible witch Canon and a TC (unless you go for 1D).

Sharp wide open, super sharp from 6.3; Takes TC with full AF; 2x very good from f9.

Heavy; Inconsistent AF wich requires micradjustment.

This is a real gem of a lens. Very fast (f2.8 through the entire zoom range), allowing the capture of quality images in lower light situations than smaller aperture zooms. Reaching all the way to 300mm provides the photographer with an excellent tool for sports as well as capturing candid people...

The Sigma AF 120-300mm f/2.8 APO EX HSM DG OS is a refreshingly unique design. It offers the best of both worlds - the flexibility of the popular 70-200mm f/2.8 tele zoom lenses and the reach of the big 300mm f/2.8 prime lenses. The question of the day is, of course, whether it can deliver ?

Practically every optics producer has a unique lens on their offer, something which you won't find in line-ups of its competitors. Sigma boasts several such models, mainly among its zoom telephoto devices; for example the very well-done Sigma 100-300 mm f/4 DG EX APO IF HSM was one of a kind.

unacceptable frame edges after attaching the converter; weak performance against bright light; necessity of using huge 105 mm filters; lack of autofocus limiter

High-quality telephoto lenses for DSLRs are tricky to buy. They're a huge investment, with prices starting at around £1,500 and heading sharply skywards. There are also considerable usability problems: long focal lengths require fast shutter speeds, which require large apertures, which all results...

This lens is a beast. I have a Canon 300 that I absolutely love, but as a single shooter following the ball at a baseball or fast pitch softball game, the 300mm is too much for a good part of the time. The 120-300 range is great. Used it with a 1Dx and 7Dm2. Used with a canon 1.4iii as well.

OK you know a 300mm F2.8 is going to be heavy, that is a given and since you know that up front it is not a negative.First of all I needed this for a trip to Alaska, Adorama got to me a day early. Woohoo to them.The lens is remarkable for several reasons.

This lens fills the void between the 70-200mm zoom lenses and the fixed 300mm lenses. Great for shooting wildlife that is on the move. Also good for sports where a 300mm or 400mm is too much reach and the 70-200mm may not be enough. I can easily shoot both ends of the floor at a basketball game.

The 120-300mm is a big big, bold and beautiful lens that is...