Sigma 120-400mm F4.5-5.6 DG HSM is a Variable aperture Auto Focus (AF) Super Telephoto Zoom
lens with 35mm FF max sensor coverage, and it is designed to be used with KAF3 Mount
What type of photography is the Sigma 120-400mm F4.5-5.6 DG HSM lens good for?
The choice of photography type for which you intend to use the Sigma 120-400mm F4.5-5.6 DG HSM is a crucial decision factor. Below, we have assessed its suitability for various photography scenarios:
Reasons to Buy the Sigma 120-400mm F4.5-5.6 DG HSM Lens
Here we've included a summary of the advantages and disadvantages of the Sigma 120-400mm F4.5-5.6 DG HSM lens in a list form to assist you in determining whether it offers the features you need.
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| Distance Scale
| Hood supplied
| Tripod Collar
| Full-time Manual Focusing
| Covers Full-Frame Sensor
| 9 Diaphragm Blades for Smooth Bokeh
| 400mm reach great for Wildlife Photography
Buy Sigma 120-400mm F4.5-5.6 DG HSM from Amazon or B&H PHOTO
| No Weather Sealing
| Lens Extends while zooming
| Slow Aperture at Wide end
| Slow Aperture at Tele end
| Variable Aperture
Sigma 120-400mm F4.5-5.6 DG HSM is compatible with cameras that have a Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Sigma 120-400mm F4.5-5.6 DG HSM is also available in Sony Alpha mount.
Size, Weight and Filter Thread
The size and weight are crucial factors to consider when searching for your next lens. Sigma 120-400mm F4.5-5.6 DG HSM has a maximum diameter of 92mm and total length of 203mm when not extended. It weighs 1640g / 57.8 oz.
Sigma 120-400mm F4.5-5.6 DG HSM has a filter thread of 77mm. Below are links to the filters that we recommend you to consider for your Sigma 120-400mm F4.5-5.6 DG HSM:
Sigma 120-400mm F4.5-5.6 DG HSM has a focal range of 120-400mm and 3.3X zoom ratio. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 180 - 600mm.
With a total length of 203mm and a weight of 1640g, the Sigma 120-400mm F4.5-5.6 DG HSM is a large lens. Fortunately, it comes with a tripod collar which you can use to attach the lens directly to a tripod or monopod instead of attaching the camera. This connection helps to better balance the lens/kit combination.
Optical Image Stabilization
Sigma 120-400mm F4.5-5.6 DG HSM doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Sigma 120-400mm F4.5-5.6 DG HSM features Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.
Maximum Magnification Ratio
Sigma 120-400mm F4.5-5.6 DG HSM has a Max Magnification Ratio of 0.24x and has a minimum focusing distance of 1.5m.
Below are the 3 Super Telephoto Zoom type Pentax KAF mount lens alternatives with highest max magnification ratios:
Sigma 120-400mm F4.5-5.6 DG HSM is a variable aperture lens with a max aperture of f4.5 and a minimum aperture of f22 at 120mm, and a max aperture of f5.6 and minimum aperture of f28 at 400mm .
Sigma 120-400mm F4.5-5.6 DG HSM's optical formula consists of 21 elements in 15 groups . Special elements used in this design is 3 SLD glass elements.
Sigma 120-400mm F4.5-5.6 DG HSM comes with a removable lens hood which is handy to reduce lens flare and glare in your photos.
Popular Comparisons of Sigma 120-400mm F4.5-5.6 DG HSM
Here are the eight most popular comparisons of the Sigma 120-400mm F4.5-5.6 DG HSM amongst Camera Decision readers.
Top Alternatives of Sigma 120-400mm F4.5-5.6 DG HSM Lens
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