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Sigma 18-125mm F3.8-5.6 DC HSM Pentax KAF3 Review
Sigma 18-125mm F3.8-5.6 DC HSM

Main Features

  • 18-125mm Focal Range
  • F3.8 - F5.6 Max Aperture
  • Filter Thread: 62mm
  • Max Format: APS-C / DX
  • Pentax KAF3 Mount
  • Weight: 490g.
  • Diameter: 74mm
  • Length: 89mm
  • Min Focus Distance:0.35m
  • Max Magnification:0.26x
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Sigma 18-125mm F3.8-5.6 DC HSM Overview
Sigma 18-125mm F3.8-5.6 DC HSM is an Auto Focus (AF) SuperZoom lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.

Lens Mount

Sigma 18-125mm F3.8-5.6 DC HSM is compatible with cameras that have Pentax KAF3 lens mount.Some of the latest released cameras with Pentax KAF3 lens mount are , and .

Sensor Coverage

Max sensor coverage of Sigma 18-125mm F3.8-5.6 DC HSM is APS-C / DX.

Focal Range

Sigma 18-125mm F3.8-5.6 DC HSM has a focal range of 18-125mm and 6.9X zoom ratio. When mounted on a APS-C / DX format camera, it provides an 35mm (FF) equivalent of 27 - 187.5mm.

Zoom Lock

Sigma 18-125mm F3.8-5.6 DC HSM has a Zoom lock feature which eliminates Zoom creep where focal length of the lens changes with gravity when it's held downwards or upwards.

Aperture

Sigma 18-125mm F3.8-5.6 DC HSM has a max aperture of f3.8 at 18mm and max aperture of f5.6 at 125mm .
Pros and Cons of Sigma 18-125mm F3.8-5.6 DC HSM

PROs
Built-in Autofocus
Hood supplied
Focus Distance Limiter
Zoom Lock
Versatile Lens with a Zoom Ratio of 6

CONs
No Weather Sealing
Lens Extents while focusing
Slow Aperture at Wide end
Slow Aperture at Tele end
Variable Aperture
Sigma 18-125mm F3.8-5.6 DC HSM Detailed Specifications

General
Brand Sigma
Lens Type Zoom
Lens Type SuperZoom
Lens Mount Pentax KAF3
Max Format APS-C / DX
Focal Range 18-125mm
Image Stabilization No
Colour Unknown
Zoom Method No Zoom
Power Zoom No Zoom
Zoom Lock Yes
Zoom Ratio 6.9X
APERTURE
Max Aperture F3.8 - F5.6
Min Aperture F22.0 - F36.0
Aperture Ring No
Diaphragm Blades 7
Optics
Optical Elements 16
Optical Groups 12
Special Elements 2 SLD (Special Low Dispersion) glass elements 1 molded glass aspherical element 2 hybrid aspherical elements

FOCUSING
Min Focus Distance 0.35m
Max Magnification 0.26X
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 490g
Diameter 74mm
Length 89mm
Materials metal mount
Weather Sealing No
Filter Thread 62mm
Filter Notes Does not rotate on focusing
Hood Supplied Yes
Tripod Collar No
Sigma 18-125mm F3.8-5.6 DC HSM Alternatives in Pentax KAF3 Mount
Model Coverage Weight Focusing Street Price
Pentax smc DA 18-135mm F3.5-5.6ED AL IF DC WR Lens Pentax smc DA 18-135mm F3.5-5.6ED AL IF DC WR
Compare
APS-C / DX 405gr AF Amazon B&H Photo
Frequently Asked Questions about Sigma 18-125mm F3.8-5.6 DC HSM
is the Sigma 18-125mm F3.8-5.6 DC HSM a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 18-125mm F3.8-5.6 DC HSM
is the Sigma 18-125mm F3.8-5.6 DC HSM an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 18-125mm F3.8-5.6 DC HSM
Does Sigma 18-125mm F3.8-5.6 DC HSM have Image Stabilization?
Does Sigma 18-125mm F3.8-5.6 DC HSM have Aperture Ring?
What is the Maximum Magnification Ratio of Sigma 18-125mm F3.8-5.6 DC HSM
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