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 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...

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...

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.

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

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

Gary Wolstenholme reviews the Sigma 120-300mm f/2.8 DG OS HSM telephoto zoom lens.

Good sharpness throughout the range; Low CA; Excellent build; Optical stabilisation; Fast focusing; Very good value for money

Variable close focusing distance

Sigma's 120-300mm F2.8 DG OS HSM is the lens to get if a 70-200mm f/2.8 just isn't long enough, but you'll need a strong back to lug it. (4.5 out of 5) Editor's Choice Pros Wide f/2.8 aperture throughout zoom range Impressive telephoto reach Very sharp Minimal distortion Excellent build quality...

Wide f/2.8 aperture throughout zoom range; Impressive telephoto reach; Very sharp; Minimal distortion; Excellent build quality; Compatible with USB dock

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