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Black cylindrical zoom lens with wide front element and textured focus ring

SIGMA

SIGMA 12-24mm f/4.5-5.6 DG HSM Ultra Wide Zoom Lens Pentax Samsung camera lens

SKU CH-221R-KTXFW

Ultra-wide zoom lens covers 12-24mm with 122-degree diagonal view for Pentax and Samsung DSLRs

  • Focus systemManual Focus
  • Product typeZoom Lens
  • Compatible withDSLR Camera
  • Product colorBlack
  • Ultra-wide 122° diagonal view captures expansive scenes
  • 12–24 mm focal range covers dramatic perspectives
  • Super Multi Coating cuts flare and ghosting
  • Internal focusing keeps lens length constant at 3.9 in
  • Close 11 in focus distance allows near-subject detail

Ultra Wide Angle Zoom for DSLR

The SIGMA 12-24mm f/4.5-5.6 DG HSM is an ultra wide angle zoom lens built for 35mm SLR cameras using Pentax or Samsung mounts. It covers a 12mm to 24mm focal length with a maximum aperture of f/4.5 at the wide end and f/5.6 at the long end. Super Multi Coating reduces flare and ghosting while an internal focus mechanism keeps the barrel length constant during focusing.

Suited for expansive scenes not close ups

This lens suits photographers who need an extremely wide field of view reaching 122 degrees on the diagonal for architecture interiors or sweeping landscapes. The minimum focus distance of 11 inches allows some foreground emphasis but the optic is not a macro lens so buyers who need 1:1 reproduction should look elsewhere. The variable aperture also makes it less ideal for shooters who require a constant f/2.8 brightness throughout the zoom range.

122 degree diagonal coverage decides fit

The defining specification is the 122 degree diagonal angle of view at the 12mm setting which determines whether the lens fits the intended wide angle purpose. At 24mm the angle narrows to 84.1 degrees still providing a broad perspective for environmental work. The optical formula uses 16 elements in 12 groups and stops down to f/22 for depth of field control.

How it compares

Measured against everything we stock in Interchangeable Camera Lenses, at today’s prices. Recalculated every night.

Price $755.99
Pricier than about 67% of the 2,570 comparable items (median $546.49).

Specifications

Product
Brand nameSIGMA
Model name200109
Product typeZoom Lens
Product colorBlack
Audio & video
Focus systemManual Focus
Compatibility
Compatible withDSLR Camera

Questions about this item

What filter thread size does the 12-24mm f/4.5-5.6 DG HSM lens require?

The lens barrel diameter is 3.4 in, so standard screw-on filters cannot attach directly; a dedicated filter holder system for ultra-wide zooms is needed.

How do I switch between autofocus and manual focus on this Sigma lens, and what step is often missed?

The lens uses a focus-mode switch on the barrel; the step users miss is ensuring the camera body is also set to AF-S or AF-C so the HSM motor actually drives the internal focus group.

When should the Super Multi Coating on the front element be cleaned or professionally serviced?

Clean only when visible smudges affect images; use a blower first, then a microfibre cloth with lens fluid. Professional re-coating is rarely needed unless the coating is physically scratched.

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