Sigma 120-400mm f/4.5-5.6 DG OS HSM APO Autofocus Lens

Model #728101

USA Version
Sigma 728101 1
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Filter thread 77 mm
Dimensions (dxl) Approx. 3.8 x 8.0" (9.65 x 20.32 cm)
Weight 3.86 lb (1.75 kg)


Format compatibility 35mm Film / Full-Frame Digital Sensor
Canon (APS-C)
Diaphragm blades 9
Focal length 120 - 400 mm
Minimum focus distance 4.92' (1.50 m)
Camera mount type Canon EF
Groups/elements 15/21
Maximum reproduction ratio 1:4.2
Angle of view 20.4° - 6.2°
Aperture Maximum: f/4.5 - 5.6
Minimum: f/22
Magnification 0.23x


Tripod collar Yes
Image stabilization Yes
Autofocus Yes
Expert Reviews
Digital slr photo.34750791
28 March 2014

While no lens of this power is going to be compact, the Sigma is as light and short as you could reasonably expect. Like any long, weighty telephoto, ideally you would always combine this lens with the stability of a support. This isn’t always practical, though, particularly when shooting wildlife.

The digital picture.34755376
13 August 2011

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.

5 April 2010

Gary Wolstenholme takes a look at this 3.3x super-telephoto zoom from Sigma with optical stabilisation.

  • +

    Priced well, Good build quality, Optical Stabilisation, Silent focusing with full-time manual override

  • -

    Prone to flare when used without the supplied lens hood, Loose zoom mechanism suffers with zoom creep, Hunts for focus in low light conditions

Photozone de.34752480
13 August 2011

The Sigma AF 120-400mm f/4.5-5.6 DG HSM OS is a consumer grade tele zoom lens with a relatively decent albeit not spectacular performance. The resolution figures are generally fine in the image center whereas the borders/corners are just soso in the lower part of the zoom range.

11 March 2011

A 3.3x zoom lens covering super-telephoto focal lengths, with optical stabilisation to aid hand held shooting.

  • +

    Priced well, Good build quality, Optical Stabilisation, Silent focusing with full-time manual override

  • -

    Prone to flare when used without the supplied lens hood, Loose zoom mechanism suffers with zoom creep, Hunts for focus in low light conditions

22 August 2008

A close cousin to the APO 150-500mm F5-6.3 DG OS HSM lens, which has also been reviewed on the Photo Review website, Sigma's APO 120-400mm F4.5-5.6 DG OS HSM lens can be used on both 'full frame' and 'APS-C-sized' DLSR cameras as well as traditional 35mm SLRs.

User Reviews
9 April 2017

More than happy with this lens. I did a lot of searching around to find something in my price range that still had image stabilization. If I had a 2k budget I would have gone with the canon but I can't imagine spending that kind of money after spending an afternoon with this lens.

Photography review.34752477
29 June 2010

Not a bad lens for the money this Sigma can be quite sharp and reasonably quick to focus if you know how to use it and your camera to their maximum potential. This is not a point and shoot type of lens , it does require your input to get the best out of it.I found it quite heavy when lugging it all...

  • +

    Cost effective., High build quality., Smooth focusing., Quiet,accurate HSM AF motor., Great adjustable tripod leg mounting shoe., Zoom creep lock.

  • -

    Soft wide open at maximum zoom/aperture., Heavy., Autofocus can hunt a bi,t but once locked on to the general target area is very fast.

6 July 2009

The OS takes some time of getting use to anything else my wild life/surfing pictures are really great.

  • +

    Price, Sharp, and Over all Performance. I bought the Canon 100-400mm F/4L but returned it after 4days when my friend recommended my this lens and never looked back

  • -


4 weeks ago

Very pleased with the results. Used on Canon 550D.

24 June 2017

great service and product

2 May 2017

sigma just doesn't have it in my book, been using manual lenses for a while on digital cameras and this big thing just itsn't on pare with them

1 December 2016

this is a fantastic lens...way better than the canon /nikon as a RAZOR...even hand held at 400 zoom...tremendous....but i now have the 150-500 version....and ditto results...grab a bargain b4 they all go

17 October 2016

I had the exact same lens and dropped it a couple of times - and it still worked for 18 more months. I bought this same lens again to replace it - takes great photos.

14 October 2016

After lots of thought and research I went ahead and made this purchase. For outdoor sports, events and nature can't beat this. The zooming motion at the end of the lens was an adjustment. The reach vs the 70-200 allows me to be closer to the action without getting closer.

15 September 2016

Thank You!!! Excellent product :)

Product Highlights
  • For Canon EOS
  • Zoom Telephoto
  • Compatible w/Sigma APO Teleconverters
Average Expert Score
Average User Score
In The Box
  • Sigma 120-400mm f/4.5-5.6 DG OS HSM APO Autofocus Lens
  • Front & Rear Caps
  • Lens Hood
  • Tripod Collar
  • Case
  • Strap
  • Limited 1-Year North and South America Warranty Against Manufacturing and Workmanship Defects.
  • Limited 3-Year U.S.A. Extended Warranty Extension Against Manufacturing and Workmanship Defects.
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