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Sigma 120-400mm F4.5-5.6 DG HSM Pentax KAF3 Review

Sigma 120-400mm F4.5-5.6 DG HSM

Main Features

  • 120-400mm Focal Range
  • F4.5 - F5.6 Max Aperture
  • Filter Thread: 77mm
  • Max Format: 35mm FF
  • Pentax KAF3 Mount
  • Weight: 1640g.
  • Diameter: 92mm
  • Length: 203mm
  • Min Focus Distance:1.5m
  • Max Magnification:0.24x
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Sigma 120-400mm F4.5-5.6 DG HSM Overview

Sigma 120-400mm F4.5-5.6 DG HSM is an Auto Focus (AF) Super Telephoto Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.

Lens Mount

Sigma 120-400mm F4.5-5.6 DG HSM is compatible with cameras that have Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are Pentax K-3 III, Pentax K-1 II and Pentax KP.

Sigma 120-400mm F4.5-5.6 DG HSM is also available in Sony Alpha mount.

Focal Range

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.

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).

Zoom Method

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.

Aperture

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 .

Optical Formula

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.

Lens Hood

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 is the eight most popular comparisons of 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
Model Coverage Weight Focusing Street Price
Pentax D FA 150-450mm F4.5-5.6 ED DC AW Lens Pentax D FA 150-450mm F4.5-5.6 ED DC AW
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35mm FF 2000gr AF Amazon B&H Photo
Sigma 150-500mm F5-6.3 DG OS HSM Lens Sigma 150-500mm F5-6.3 DG OS HSM
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35mm FF 1780gr AF Amazon B&H Photo
Pentax D FA 70-200mm F2.8ED DC AW Lens Pentax D FA 70-200mm F2.8ED DC AW
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35mm FF 1755gr AF Amazon B&H Photo
Sigma 50-200mm F4-5.6 DC OS HSM Lens Sigma 50-200mm F4-5.6 DC OS HSM
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APS-C / DX 420gr AF Amazon B&H Photo
Sigma 70-300mm F4-5.6 DG OS Lens Sigma 70-300mm F4-5.6 DG OS
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35mm FF 610gr AF Amazon B&H Photo
Pentax smc D-FA 100mm F2.8 Macro WR Lens Pentax smc D-FA 100mm F2.8 Macro WR
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35mm FF 340gr AF Amazon B&H Photo
Pentax smc DA 300mm F4.0 ED IF SDM Lens Pentax smc DA 300mm F4.0 ED IF SDM
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APS-C / DX 1070gr AF Amazon B&H Photo
Sigma 70-200mm F2.8 EX DG Macro HSM II Lens Sigma 70-200mm F2.8 EX DG Macro HSM II
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35mm FF 1390gr AF Amazon B&H Photo

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**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Pros and Cons of Sigma 120-400mm F4.5-5.6 DG HSM


PROs
Built-in Autofocus
Hood supplied
Tripod Collar
Full-time Manual Focusing
Covers Full-Frame Sensor

CONs
No Weather Sealing
Lens Extents while focusing
Slow Aperture at Wide end
Slow Aperture at Tele end
Variable Aperture
Heavy
Pricey
Sigma 120-400mm F4.5-5.6 DG HSM Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
Pentax D FA 150-450mm F4.5-5.6 ED DC AW Lens Pentax D FA 150-450mm F4.5-5.6 ED DC AW
Compare
35mm FF 2000gr AF Amazon B&H Photo

Sigma 120-400mm F4.5-5.6 DG HSM Detailed Specifications


General
Brand Sigma
Lens Type Zoom
Lens Type Telephoto Zoom
Lens Mount Pentax KAF3
Max Format 35mm FF
Focal Range 120-400mm
Image Stabilization No
Colour Unknown
Zoom Method Rotary (extending)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 3.3X
APERTURE
Max Aperture F4.5 - F5.6
Min Aperture F22.0 - F28.0
Aperture Ring No
Diaphragm Blades 9
Optics
Optical Elements 21
Optical Groups 15
Special Elements 3 SLD glass elements

FOCUSING
Min Focus Distance 1.5m
Max Magnification 0.24X
Autofocus Yes
AF Motor Type Ring-type ultrasonic
Full Time Manual Yes
Focus Method Rear
Distance Scale Yes
DoF Scale No
PHYSICAL SPECS
Weight 1640g
Diameter 92mm
Length 203mm
Materials Metal mount
Weather Sealing No
Filter Thread 77mm
Filter Notes -
Hood Supplied Yes
Tripod Collar Yes
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Frequently Asked Questions about Sigma 120-400mm F4.5-5.6 DG HSM
is the Sigma 120-400mm F4.5-5.6 DG HSM a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 120-400mm F4.5-5.6 DG HSM
is the Sigma 120-400mm F4.5-5.6 DG HSM an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 120-400mm F4.5-5.6 DG HSM
Does Sigma 120-400mm F4.5-5.6 DG HSM have Image Stabilization?
Does Sigma 120-400mm F4.5-5.6 DG HSM have Aperture Ring?
What is the Maximum Magnification Ratio of Sigma 120-400mm F4.5-5.6 DG HSM
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