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Pentax smc DA 17-70mm F4.0 AL IF SDM Review

Pentax smc DA 17-70mm F4.0 AL IF SDM

Main Features

  • 17-70mm Focal Range
  • F4.0 Max Aperture
  • Filter Thread: 67mm
  • Max Format: APS-C / DX
  • Pentax KAF3 Mount
  • Weight: 485g.
  • Diameter: 75mm
  • Length: 94mm
  • Min Focus Distance:0.28m
  • Max Magnification:0.31x
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Pentax 17-70mm F4.0 AL SDM Overview

Pentax 17-70mm F4.0 AL SDM 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

Pentax 17-70mm F4.0 AL SDM 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 .

Focal Range

Pentax 17-70mm F4.0 AL SDM 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

Pentax 17-70mm F4.0 AL SDM 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).

Alternatively, you can check the Sigma 17-70mm F2.8-4 DC OS HSM C in Pentax KAF3 mount that have similar focal range but features Optical Image Stabilization.

Lenses Similar to Pentax 17-70mm F4.0 AL SDM With Optical Image Stabilization
Model Coverage Weight Focusing Street Price
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
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

Zoom Method

Pentax 17-70mm F4.0 AL SDM 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

Pentax 17-70mm F4.0 AL SDM has a Max Magnification Ratio of 0.31x and has a minimum focusing distance of 0.28m. For a non-macro lens, the 0.31x is considered a high magnification and will come handy for close-up shots.

Aperture

Pentax 17-70mm F4.0 AL SDM is a fixed aperture lens with a constant max aperture of f4 from 17mm all the way to the 70mm .

Optical Formula

Pentax 17-70mm F4.0 AL SDM's optical formula consists of 17 elements in 12 groups .

Lens Hood

Body Colour

Pentax 17-70mm F4.0 AL SDM is available in Black color.

Popular Comparisons of Pentax 17-70mm F4.0 AL SDM

Here is the eight most popular comparisons of Pentax 17-70mm F4.0 AL SDM amongst Camera Decision readers.

Top Alternatives of Pentax 17-70mm F4.0 AL SDM 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
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
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
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 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 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
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
OM System 12-40mm F2.8 PRO II Lens OM System 12-40mm F2.8 PRO II
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FourThirds 382gr AF Amazon B&H Photo

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Pros and Cons of Pentax smc DA 17-70mm F4.0 AL IF SDM


PROs
Built-in Autofocus
Full-time Manual Focusing
Fast and Bright at Tele end
Constant f4 Aperture throughout the range

CONs
Lens Extents while focusing
Slow Aperture at Wide end
Pentax smc DA 17-70mm F4.0 AL IF SDM Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Lens Sigma 17-70mm F2.8-4 DC MACRO OS HSM C
Compare
APS-C / DX 465gr 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

Pentax 17-70mm F4.0 AL SDM Detailed Specifications


General
Brand Pentax
Lens Type Zoom
Lens Type Standard Zoom
Lens Mount Pentax KAF3
Max Format APS-C / DX
Focal Range 17-70mm
Image Stabilization No
Colour Black
Zoom Method Rotary (extending)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 4.1X
APERTURE
Max Aperture F4.0
Min Aperture F22.0
Aperture Ring No
Diaphragm Blades 7
Optics
Optical Elements 17
Optical Groups 12

FOCUSING
Min Focus Distance 0.28m
Max Magnification 0.31X
Autofocus Yes
AF Motor Type Ultrasonic
Full Time Manual Yes
Focus Method Internal
Distance Scale Yes
DoF Scale Yes
PHYSICAL SPECS
Weight 485g
Diameter 75mm
Length 94mm
Weather Sealing Unknown
Filter Thread 67mm
Filter Notes -
Tripod Collar No
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Frequently Asked Questions about Pentax smc DA 17-70mm F4.0 AL IF SDM
is the Pentax smc DA 17-70mm F4.0 AL IF SDM a Weather Sealed lens?
What is the Minimum Focusing Distance of Pentax smc DA 17-70mm F4.0 AL IF SDM
is the Pentax smc DA 17-70mm F4.0 AL IF SDM an Autofocus (AF) lens?
What is the Filter Thread Size of Pentax smc DA 17-70mm F4.0 AL IF SDM
Does Pentax smc DA 17-70mm F4.0 AL IF SDM have Image Stabilization?
Does Pentax smc DA 17-70mm F4.0 AL IF SDM have Aperture Ring?
What is the Maximum Magnification Ratio of Pentax smc DA 17-70mm F4.0 AL IF SDM
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