This 3390g behemoth of a lens fits snugly into Sigma's Sport line of glass and is designed to be mounted to a tripod rather than hand-held. This leads it to be rather more specialist than many lenses in test, though doesn't detract from its image quality.

Excellent lens! I'm extremely happy with this product, especially when paired with the Sigma USB Dock.

It's bit sharper @300mm F2.8 than Canon 300mm F4 L @F4. But at 300mm you would get similar reach about 280mm of Canon teles.

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.

required no "focus adjustment" out of its box on delivery on a D4s or D810, at least for me. I sold my Nikon 300/2.8 VR to purchase this dense chunk of optics. except for the added weight (near 0.4 lbs) this outperforms the prime due to its overall versatility. works well with the Sigma 1.4x TC.

Sharp; Accurate

Heavier then a Prime 300/2.8 but does more; lens foot mount needs a little rethink but adequate

This was bought to be my new wildlife lens teamed with a 2x Sigma teleconverter on a full frame Nikon D600. Just returned from a safari (I had one days practice with the lens before leaving the Uk for South Africa) and I must say my fears of it being too heavy and the image quality being compromised...

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

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 2.5x zoom lens sports a constant f/2.8 maximum aperture, silent focusing and optical stabilisation. It slots into Sigma's 'Sports' range of lenses and is especially interesting as the zoom range is similar to that of a 70-200mm lens with a 1.4x teleconverter fitted, whilst maintaining a fast...

The Sigma 120-300mm F2.8 DG OS HSM ($3,599 direct) isn't a lens for the faint of heart. The zoom, which is compatible with full-frame and APS-C camera bodies and is available in Canon, Nikon, and Sigma mounts, brings new meanings to the words big and heavy.

Wide f/2.8 aperture throughout zoom range; Impressive telephoto reach; Very sharp; Minimal distortion; Excellent build quality.

Expensive; Very large and heavy; Huge front element increases filter costs