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Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Pentax KAF3 Review

Sigma 17-70mm F2.8-4 DC MACRO OS HSM C

Main Features

  • 17-70mm Focal Range
  • F2.8 - F4.0 Max Aperture
  • Image Stabilization
  • Filter Thread: 72mm
  • Max Format: APS-C / DX
  • Pentax KAF3 Mount
  • Weight: 465g.
  • Diameter: 79mm
  • Length: 82mm
  • Min Focus Distance:0.22m
  • Max Magnification:0.36x
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Sigma 17-70mm F2.8-4 DC OS HSM C Overview

Sigma 17-70mm F2.8-4 DC OS HSM C is a Variable aperture Auto Focus (AF) Standard Zoom lens with Optical Image stabilization and APS-C / DX max sensor coverage, and it is designed to be used with Pentax KAF3 mount cameras.

What type of photography is the Sigma 17-70mm F2.8-4 DC OS HSM C lens good for?

The type of photography that you are planning to use the Sigma 17-70mm F2.8-4 DC OS HSM C is an important decision factor. Here we have evaluated its suitability to various photography scenarios:

Photography Type Suitability
Bird/WildlifeAverage
SportsGood
PortraitVery Good
TravelVery Good
StreetGood
WeddingVery Good
Walk AroundVery Good
VloggingFair
LandscapeGood
MacroAverage

Lenses in Pentax KAF3 Mount with Same Focal and Aperture Range
Model Coverage Weight Focusing Street Price
Sigma 17-70mm F2.8-4 DC Macro OS HSM Lens Sigma 17-70mm F2.8-4 DC Macro OS HSM
Compare
APS-C / DX 520gr AF Amazon B&H Photo

Reasons to Buy Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Lens

Here, we've included a summary of the advantages and disadvantages of the Sigma 17-70mm F2.8-4 DC MACRO OS HSM C lens in a list form to help you determine whether it offers the features you need.

PROs
Optical Image Stabilization
Autofocus
Distance Scale
Hood supplied
Fast Aperture at Wide end
Fast Aperture at Tele end
Minimum focus distance of 0.22m / 8.7 inch
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Buy Sigma 17-70mm F2.8-4 DC OS HSM C from Amazon or B&H PHOTO


CONs
Lens Extents while zooming
Variable Aperture

Lens Mount

Sigma 17-70mm F2.8-4 DC OS HSM C 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 17-70mm F2.8-4 DC OS HSM C is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (DX) mounts.

Size, Weight and Filter Thread

Size and weight is a very important decision factor when searching for your next lens. Sigma 17-70mm F2.8-4 DC OS HSM C has a maximum diameter of 79mm and total length of 82mm when not extended . It weighs 465g / 16.4 oz.

Sigma 17-70mm F2.8-4 DC OS HSM C has a filter thread of 72mm.

Focal Range

Sigma 17-70mm F2.8-4 DC OS HSM C has a focal range of 17-70mm and 4.1X zoom ratio which has a 35mm equivalent focal range of 25.5-105mm when used on a APS-C / DX format camera.

Optical Image Stabilization

Sigma 17-70mm F2.8-4 DC OS HSM C features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.

Zoom Method

Sigma 17-70mm F2.8-4 DC OS HSM C 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 17-70mm F2.8-4 DC OS HSM C has a Max Magnification Ratio of 0.36x and has a minimum focusing distance of 0.22m. For a non-macro lens, the 0.36x is considered a high magnification and will come handy for close-up shots.

Aperture

Sigma 17-70mm F2.8-4 DC OS HSM C is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 17mm, and a max aperture of f4 and minimum aperture of f22 at 70mm .

Focal Length Max Aperture Min Aperture
17mm F2.8 F22
70mm F4 F22

Optical Formula

Sigma 17-70mm F2.8-4 DC OS HSM C's optical formula consists of 16 elements in 14 groups . Following special elements are used in this design:

  • 2 FLD ("F" Low Dispersion) glass elements
  • 1 SLD (Special Low Dispersion) glass element
  • 3 aspherical glass lenses including double sided aspherical lens

Lens Hood

Sigma 17-70mm F2.8-4 DC OS HSM C comes with a removable lens hood which is handy to reduce lens flare and glare in your photos. The model number of the hood is LH780-03.

Popular Comparisons of Sigma 17-70mm F2.8-4 DC OS HSM C

Here is the eight most popular comparisons of Sigma 17-70mm F2.8-4 DC OS HSM C amongst Camera Decision readers.

Top Alternatives of Sigma 17-70mm F2.8-4 DC OS HSM C Lens
Model Coverage Weight Focusing Street Price
HD Pentax DA 16-85mm F3.5-5.6 ED DC WR Lens HD Pentax DA 16-85mm F3.5-5.6 ED DC WR
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APS-C / DX 488gr AF Amazon B&H Photo
HD Pentax D FA 24-70mm F2.8 ED SDM WR Lens HD Pentax D FA 24-70mm F2.8 ED SDM WR
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35mm FF 787gr AF Amazon B&H Photo
Pentax smc DA 17-70mm F4.0 AL IF SDM Lens Pentax smc DA 17-70mm F4.0 AL IF SDM
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APS-C / DX 485gr AF Amazon B&H Photo
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
Sigma 17-50mm F2.8 EX DC OS HSM Lens Sigma 17-50mm F2.8 EX DC OS HSM
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APS-C / DX 565gr AF Amazon B&H Photo
Sigma 17-70mm F2.8-4 DC Macro OS HSM Lens Sigma 17-70mm F2.8-4 DC Macro OS HSM
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APS-C / DX 520gr AF Amazon B&H Photo
Pentax DA 18-50mm F4.5-5.6 DC WR RE Lens Pentax DA 18-50mm F4.5-5.6 DC WR RE
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APS-C / DX 158gr AF Amazon B&H Photo
HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR Lens HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR
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35mm FF 440gr 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.

Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
Pentax smc DA 17-70mm F4.0 AL IF SDM Lens Pentax smc DA 17-70mm F4.0 AL IF SDM
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APS-C / DX 485gr AF Amazon B&H Photo
Sigma 17-70mm F2.8-4 DC Macro OS HSM Lens Sigma 17-70mm F2.8-4 DC Macro OS HSM
Compare
APS-C / DX 520gr AF Amazon B&H Photo

Sigma 17-70mm F2.8-4 DC OS HSM C Detailed Specifications


General
Brand Sigma
Lens Type Zoom
Lens Type Standard Zoom
Lens Mount Pentax KAF3
Max Format APS-C / DX
Focal Range 17-70mm
Image Stabilization Yes
Colour Unknown
Zoom Method Rotary (extending)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 4.1X
APERTURE
Max Aperture F2.8 - F4.0
Min Aperture F22.0
Aperture Ring No
Diaphragm Blades 7
Optics
Optical Elements 16
Optical Groups 14
Special Elements 2 FLD ("F" Low Dispersion) glass elements, 1 SLD (Special Low Dispersion) glass element, 3 aspherical glass lenses including double sided aspherical lens

FOCUSING
Min Focus Distance 0.22m
Max Magnification 0.36X
Autofocus Yes
AF Motor Type Micro-type ultrasonic
Full Time Manual No
Focus Method Internal
Distance Scale Yes
PHYSICAL SPECS
Weight 465g
Diameter 79mm
Length 82mm
Materials Plastic barrel, metal mount
Weather Sealing Unknown
Filter Thread 72mm
Filter Notes Does not rotate on focusing
Hood Supplied Yes
Hood Code LH780-03
Tripod Collar No
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Frequently Asked Questions about Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
is the Sigma 17-70mm F2.8-4 DC MACRO OS HSM C a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
is the Sigma 17-70mm F2.8-4 DC MACRO OS HSM C an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
Does Sigma 17-70mm F2.8-4 DC MACRO OS HSM C have Image Stabilization?
Does Sigma 17-70mm F2.8-4 DC MACRO OS HSM C have Aperture Ring?
What is the Maximum Magnification Ratio of Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
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