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Pentax smc DA 17-70mm F4.0 AL IF SDM KAF3 Mount 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 / 1.07 lb
  • Dimensions(øxL): 75mm x 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 a Fixed aperture Auto Focus (AF) Standard Zoom lens with APS-C / DX max sensor coverage, and it is designed to be used with KAF3 Mount cameras.

What type of photography is the Pentax 17-70mm F4.0 AL SDM lens good for?

The type of photography that you are planning to use the Pentax 17-70mm F4.0 AL SDM 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

Reasons to Buy Pentax smc DA 17-70mm F4.0 AL IF SDM Lens

Here we've included a summary of the advantages and disadvantages of the Pentax smc DA 17-70mm F4.0 AL IF SDM lens in a list form to help you determine whether it offers the features you need.

PROs
Autofocus
Distance Scale
DoF(Depth of Field) Scale
Full-time Manual Focusing
Fast Aperture at Tele end
Constant f4 aperture throughout the range
Minimum focus distance of 0.28m / 11.0 inch
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Buy Pentax 17-70mm F4.0 AL SDM from Amazon or B&H PHOTO


CONs
Lens Extents while zooming


Lens Mount

Pentax 17-70mm F4.0 AL SDM 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 , and .

Size, Weight and Filter Thread

Size and weight is a very important decision factor when searching for your next lens. Pentax 17-70mm F4.0 AL SDM has a maximum diameter of 75mm and total length of 94mm when not extended. It weighs 485g / 17.1 oz.

Pentax 17-70mm F4.0 AL SDM has a filter thread of 67mm. Below are links to the filters that we recommend you to consider for your Pentax 17-70mm F4.0 AL SDM:

  • 67mm Variable ND Lens Filters
  • 67mm Circular Polarizer Lens Filters
  • 67mm Clear Protection Lens Filters




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
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

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.

Below are the 3 Standard Zoom type Pentax KAF3 mount lens alternatives with highest max magnification ratios:

  • Sigma 17-70mm F2.8-4 DC OS HSM: 0.37x - (Compare)
  • Sigma 17-70mm F2.8-4 DC OS HSM C: 0.36x - (Compare)
  • Sigma 18-50mm F2.8-4.5 DC OS HSM: 0.24x - (Compare)

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 .

Focal Length Max Aperture Min Aperture
17mm F4 F22
70mm F4 F22

Optical Formula

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

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 are the eight most popular comparisons of the 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
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 520 g / 1.14 lb AF Amazon B&H Photo
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
Compare
APS-C / DX 488 g / 1.07 lb 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
Compare
APS-C / DX 465 g / 1.02 lb AF Amazon B&H Photo
Sigma 17-50mm F2.8 EX DC OS HSM Lens Sigma 17-50mm F2.8 EX DC OS HSM
Compare
APS-C / DX 565 g / 1.24 lb 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
Compare
35mm FF 787 g / 1.73 lb 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
Compare
APS-C / DX 283 g / 0.62 lb 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 395 g / 0.87 lb 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
Compare
APS-C / DX 158 g / 0.35 lb AF Amazon B&H Photo


**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.

Pentax smc DA 17-70mm F4.0 AL IF SDM Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
Sigma 17-50mm F2.8 EX DC OS HSM Lens Sigma 17-50mm F2.8 EX DC OS HSM
Compare
APS-C / DX 565 g / 1.24 lb 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
Compare
APS-C / DX 465 g / 1.02 lb 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 520 g / 1.14 lb 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 395 g / 0.87 lb AF Amazon B&H Photo

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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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