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Black cylindrical zoom lens with silver focus ring and 55mm filter thread

SIGMA

SIGMA 18-50mm F2.8 DC DN Contemporary L-Mount camera lens

SKU CH-KBRB-PPQM0

Compact APS-C zoom covering 18-50mm with constant f/2.8 aperture, weighing 290g and accepting 55mm filters

  • Part585969
  • TypeZoom Lens
  • ColorBlack
  • Diameter6.54 centimeters
  • CompatibilityLeica L
  • Focus TypeAuto Focus
  • Constant f/2.8 aperture across the 18-50mm zoom range
  • 290 g weight keeps the kit light for all-day shooting
  • 55 mm filter thread accepts common screw-on filters
  • Three glass-molded aspherical elements deliver sharp results
  • In-camera aberration correction handles distortion and vignetting automatically

APS-C zoom with constant f/2.8

The Sigma 18-50mm F2.8 DC DN Contemporary is built for APS-C sensor mirrorless cameras using the Leica L mount. It covers a 27-75mm full-frame equivalent range, making it suited to landscapes, street scenes, portraits and architecture. The constant f/2.8 aperture holds exposure across the zoom and supports shallow depth of field. At 290 g it stays light for all-day carry.

Passive thermal design and low power draw

The lens has no active cooling and draws power only for its stepping-motor autofocus from the camera body. In normal shooting it runs silently and adds negligible heat to the system. Its compact 6.54 cm diameter barrel balances well on small mirrorless bodies without shifting the centre of gravity.

Replaces variable-aperture kit zooms

Photographers moving up from slower kit lenses gain a constant f/2.8 across 18-50mm, which improves low-light capability and subject separation. The jump is worth it when you need consistent exposure while zooming or want shallower depth of field for portraits and close-ups. It does not suit shooters who need telephoto reach beyond 50mm or full-frame image circles.

Highlights

  • Constant f/2.8 aperture across the 18-50mm zoom range
  • 290 g weight keeps the kit light for all-day shooting
  • 55 mm filter thread accepts common screw-on filters
  • Three glass-molded aspherical elements deliver sharp results
  • In-camera aberration correction handles distortion and vignetting automatically

Specifications

BrandSIGMA
Model585969
Part Number585969
Part585969
TypeZoom Lens
ColorBlack
Diameter6.54 centimeters
CompatibilityLeica L
Focus TypeAuto Focus
Focal LengthStandard 18-50mm
Aperture2.8 millimeters
Camera Mountleica_l
Filter thread (Diameter)55 millimeters
AutofocusAuto Focus
Dimensions9.1 in x 9.1 in x 9.1 in
Weight290 grams

Questions about this item

How do I mount this lens on my L-mount camera and which way should I align the index?

Align the lens mount index with the camera body index, then rotate the lens clockwise until it clicks; the Leica L mount uses a bayonet with a single alignment mark.

What part of this lens will need cleaning or replacement after extended use?

The front 55 mm filter thread accepts protective filters that should be cleaned regularly; the internal focus motor and zoom mechanism are sealed and not user-serviceable.

At what focal length does vignetting become noticeable on APS-C sensors?

Vignetting is most visible at the 18 mm wide end when shooting wide open at f/2.8; stopping down reduces it significantly.

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