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Sigma 18-50mm F2.8-4.5 DC OS HSM Sigma SA Review

Sigma 18-50mm F2.8-4.5 DC OS HSM

Main Features

  • 18-50mm Focal Range
  • F2.8 - F4.5 Max Aperture
  • Image Stabilization
  • Filter Thread: 67mm
  • Max Format: APS-C / DX
  • Sigma SA Mount
  • Weight: 395g.
  • Diameter: 74mm
  • Length: 89mm
  • Min Focus Distance:0.3m
  • Max Magnification:0.24x
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Sigma 18-50mm F2.8-4.5 DC OS HSM Overview

Sigma 18-50mm F2.8-4.5 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 Sigma SA mount cameras.

Lens Mount

Sigma 18-50mm F2.8-4.5 DC OS HSM is compatible with cameras that have Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma SD1 Merrill, Sigma SD1 and .

Sigma 18-50mm F2.8-4.5 DC OS HSM is also available in Canon EF , Pentax KAF3, Sony Alpha and Nikon F (DX) mounts.

Focal Range

Sigma 18-50mm F2.8-4.5 DC OS HSM has a focal range of 18-50mm and 2.8X zoom ratio which has a 35mm equivalent focal range of 27-75mm when used on a APS-C / DX format camera.

Optical Image Stabilization

Sigma 18-50mm F2.8-4.5 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 18-50mm F2.8-4.5 DC OS HSM features Rotary (internal) zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compare to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.

Maximum Magnification Ratio

Sigma 18-50mm F2.8-4.5 DC OS HSM has a Max Magnification Ratio of 0.24x and has a minimum focusing distance of 0.3m.

Aperture

Sigma 18-50mm F2.8-4.5 DC OS HSM is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 18mm, and a max aperture of f4.5 and minimum aperture of f36 at 50mm .

Optical Formula

Sigma 18-50mm F2.8-4.5 DC OS HSM's optical formula consists of 16 elements in 12 groups . Following special elements are used in this design:

  • 2 SLD glass elements
  • 3 aspherical elements

Lens Hood

Sigma 18-50mm F2.8-4.5 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 18-50mm F2.8-4.5 DC OS HSM

Here is the eight most popular comparisons of Sigma 18-50mm F2.8-4.5 DC OS HSM amongst Camera Decision readers.

Top Alternatives of Sigma 18-50mm F2.8-4.5 DC OS HSM Lens
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
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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
Sigma 24-105mm F4 DG OS HSM Lens Sigma 24-105mm F4 DG OS HSM
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35mm FF 885gr AF Amazon B&H Photo
Sigma 24-70mm F2.8 DG OS HSM Art Lens Sigma 24-70mm F2.8 DG OS HSM Art
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35mm FF 1020gr AF Amazon B&H Photo
Sigma 24-70mm F2.8 EX DG Macro Lens Sigma 24-70mm F2.8 EX DG Macro
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35mm FF 715gr AF Amazon B&H Photo
Sigma 24-70mm F2.8 EX DG HSM Lens Sigma 24-70mm F2.8 EX DG HSM
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35mm FF 790gr 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
Sony FE 16-35mm F2.8 GM Lens Sony FE 16-35mm F2.8 GM
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35mm FF 680gr AF Amazon B&H Photo

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Pros and Cons of Sigma 18-50mm F2.8-4.5 DC OS HSM


PROs
Image Stabilization
Built-in Autofocus
Hood supplied
Internal Focusing
Fast and Bright at Wide end

CONs
No Weather Sealing
Variable Aperture
Sigma 18-50mm F2.8-4.5 DC OS HSM Alternatives in Sigma SA 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 565gr AF Amazon B&H Photo

Sigma 18-50mm F2.8-4.5 DC OS HSM Detailed Specifications


General
Brand Sigma
Lens Type Zoom
Lens Type Standard Zoom
Lens Mount Sigma SA
Max Format APS-C / DX
Focal Range 18-50mm
Image Stabilization Yes
Colour Unknown
Zoom Method Rotary (internal)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 2.8X
APERTURE
Max Aperture F2.8 - F4.5
Min Aperture F22.0 - F36.0
Aperture Ring No
Diaphragm Blades 7
Optics
Optical Elements 16
Optical Groups 12
Special Elements 2 SLD glass elements 3 aspherical elements

FOCUSING
Min Focus Distance 0.3m
Max Magnification 0.24X
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 395g
Diameter 74mm
Length 89mm
Materials Metal mount
Weather Sealing No
Filter Thread 67mm
Filter Notes Does not rotate on focusing
Hood Supplied Yes
Tripod Collar No
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Frequently Asked Questions about Sigma 18-50mm F2.8-4.5 DC OS HSM
is the Sigma 18-50mm F2.8-4.5 DC OS HSM a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 18-50mm F2.8-4.5 DC OS HSM
is the Sigma 18-50mm F2.8-4.5 DC OS HSM an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 18-50mm F2.8-4.5 DC OS HSM
Does Sigma 18-50mm F2.8-4.5 DC OS HSM have Image Stabilization?
Does Sigma 18-50mm F2.8-4.5 DC OS HSM have Aperture Ring?
What is the Maximum Magnification Ratio of Sigma 18-50mm F2.8-4.5 DC OS HSM
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