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Sigma 17-50mm F2.8 EX DC OS HSM Pentax KAF3 Review

Sigma 17-50mm F2.8 EX DC OS HSM

Main Features

  • 17-50mm Focal Range
  • F2.8 Max Aperture
  • Image Stabilization
  • Filter Thread: 77mm
  • Max Format: APS-C / DX
  • Pentax KAF3 Mount
  • Weight: 565g.
  • Diameter: 84mm
  • Length: 92mm
  • Min Focus Distance:0.28m
  • Max Magnification:0.2x
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Sigma 17-50mm F2.8 EX DC OS HSM Overview

Sigma 17-50mm F2.8 EX DC OS HSM is an Auto Focus (AF) Standard Zoom lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.

Lens Mount

Sigma 17-50mm F2.8 EX DC OS 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 , and .

Sigma 17-50mm F2.8 EX DC OS HSM is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (DX) mounts.

Focal Range

Sigma 17-50mm F2.8 EX DC OS HSM has a focal range of 17-50mm and 2.9X zoom ratio which has a 35mm equivalent focal range of 25.5-75mm when used on a APS-C / DX format camera.

Optical Image Stabilization

Sigma 17-50mm F2.8 EX DC OS HSM features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.

Zoom Method

Sigma 17-50mm F2.8 EX DC OS 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 17-50mm F2.8 EX DC OS HSM has a Max Magnification Ratio of 0.2x and has a minimum focusing distance of 0.28m.

Aperture

Sigma 17-50mm F2.8 EX DC OS HSM is a fixed aperture lens with a constant max aperture of f2.8 from 17mm all the way to the 50mm .

Optical Formula

Sigma 17-50mm F2.8 EX DC OS HSM's optical formula consists of 17 elements in 13 groups . Following special elements are used in this design:

  • 2 FLD glass elements
  • 2 glass mold elements
  • 1 hybrid aspherical lens

Lens Hood

Sigma 17-50mm F2.8 EX DC OS HSM comes with a removable lens hood which is handy to reduce lens flare and glare in your photos.

Popular Comparisons of Sigma 17-50mm F2.8 EX DC OS HSM

Here is the eight most popular comparisons of Sigma 17-50mm F2.8 EX DC OS HSM amongst Camera Decision readers.

Top Alternatives of Sigma 17-50mm F2.8 EX DC OS HSM Lens
Model Coverage Weight Focusing Street Price
HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR Lens HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
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APS-C / DX 283gr AF Amazon B&H Photo
Pentax DA 16-50mm F2.8 ED PLM AW Lens Pentax DA 16-50mm F2.8 ED PLM AW
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APS-C / DX 712gr AF Amazon B&H Photo
Pentax smc DA 18-55mm F3.5-5.6 AL WR Lens Pentax smc DA 18-55mm F3.5-5.6 AL WR
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APS-C / DX 230gr AF Amazon B&H Photo
Sigma 18-50mm F2.8-4.5 DC OS HSM Lens Sigma 18-50mm F2.8-4.5 DC OS HSM
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APS-C / DX 395gr AF Amazon B&H Photo
Pentax smc DA 16-50mm F2.8 ED AL IF SDM Lens Pentax smc DA 16-50mm F2.8 ED AL IF SDM
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APS-C / DX 565gr AF Amazon B&H Photo
Sigma 18-35mm F1.8 DC HSM Lens Sigma 18-35mm F1.8 DC HSM
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APS-C / DX 810gr AF Amazon B&H Photo
Pentax smc DA 18-55mm F3.5-5.6 ED AL II IF Lens Pentax smc DA 18-55mm F3.5-5.6 ED AL II IF
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APS-C / DX 220gr AF Amazon B&H Photo
Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Lens Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
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APS-C / DX 465gr 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 17-50mm F2.8 EX DC OS HSM


PROs
Image Stabilization
Built-in Autofocus
Hood supplied
Fast and Bright at Wide end
Fast and Bright at Tele end
Constant f2.8 Aperture throughout the range

CONs
No Weather Sealing
Lens Extents while focusing
Sigma 17-50mm F2.8 EX DC OS HSM Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR Lens HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
Compare
APS-C / DX 283gr AF Amazon B&H Photo
Sigma 18-50mm F2.8-4.5 DC OS HSM Lens Sigma 18-50mm F2.8-4.5 DC OS HSM
Compare
APS-C / DX 395gr AF Amazon B&H Photo

Sigma 17-50mm F2.8 EX DC OS HSM Detailed Specifications


General
Brand Sigma
Lens Type Zoom
Lens Type Standard Zoom
Lens Mount Pentax KAF3
Max Format APS-C / DX
Focal Range 17-50mm
Image Stabilization Yes
Colour Unknown
Zoom Method Rotary (extending)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 2.9X
APERTURE
Max Aperture F2.8
Min Aperture F22.0
Aperture Ring No
Diaphragm Blades 7
Optics
Optical Elements 17
Optical Groups 13
Special Elements 2 FLD glass elements 2 glass mold elements 1 hybrid aspherical lens

FOCUSING
Min Focus Distance 0.28m
Max Magnification 0.2X
Autofocus Yes
AF Motor Type Ultrasonic
Full Time Manual No
Focus Method Internal
Focus Distance Limiter No
Distance Scale Yes
DoF Scale No
PHYSICAL SPECS
Weight 565g
Diameter 84mm
Length 92mm
Materials Metal mount
Weather Sealing No
Filter Thread 77mm
Filter Notes Does not rotate on focusing
Hood Supplied Yes
Tripod Collar No
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Frequently Asked Questions about Sigma 17-50mm F2.8 EX DC OS HSM
is the Sigma 17-50mm F2.8 EX DC OS HSM a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 17-50mm F2.8 EX DC OS HSM
is the Sigma 17-50mm F2.8 EX DC OS HSM an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 17-50mm F2.8 EX DC OS HSM
Does Sigma 17-50mm F2.8 EX DC OS HSM have Image Stabilization?
Does Sigma 17-50mm F2.8 EX DC OS HSM have Aperture Ring?
What is the Maximum Magnification Ratio of Sigma 17-50mm F2.8 EX DC OS HSM
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