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Black cylindrical zoom lens with inner barrel design

SIGMA

SIGMA 28-45mm F1.8 DG DN Art 612965 camera lens

SKU CH-V3WS-89GW7

World's first full-frame zoom lens with a constant F1.8 aperture, delivering prime-level sharpness across a 28-45mm range

  • TypeZoom Lens
  • CompatibilityMirrorless Camera
  • ColorBlack
  • World's first full-frame F1.8 constant-aperture zoom lens
  • Prime-level optical sharpness across 28-45mm range
  • Inner zoom keeps length constant for stable handheld and gimbal use
  • Linear actuator motor minimises focus breathing for smooth video
  • 30cm close-focus and 1:4 magnification enable detailed near shots

Sigma 28-45mm F1.8 Art Lens

The SIGMA 28-45mm F1.8 DG DN Art is a full-frame zoom lens for Sony E-mount mirrorless cameras. It delivers a constant F1.8 maximum aperture across the 28mm to 45mm range. Optical performance is designed to match prime lens standards. An inner zoom mechanism keeps the lens length constant during operation.

Filmmakers and photographers needing fast

This lens suits creators who want a single fast zoom for environmental portraits, low-light events or video work on gimbals. The constant aperture maintains exposure while zooming. Photographers requiring focal lengths wider than 28mm or longer than 45mm will need additional lenses. Specialists needing autofocus speeds faster than the LA motor provides should consider other options.

Constant F1.8 aperture across the zoom range

The defining specification is the F1.8 maximum aperture maintained from 28mm to 45mm. This allows consistent depth of field and exposure control throughout the zoom range. The lens focuses down to 30cm at all focal lengths for close-up work. Model number 612965 identifies this specific Art series optic.

Highlights

  • World's first full-frame F1.8 constant-aperture zoom lens
  • Prime-level optical sharpness across 28-45mm range
  • Inner zoom keeps length constant for stable handheld and gimbal use
  • Linear actuator motor minimises focus breathing for smooth video
  • 30cm close-focus and 1:4 magnification enable detailed near shots

Specifications

TypeZoom Lens
CompatibilityMirrorless Camera
ColorBlack
BrandSIGMA
Model612965

Questions about this item

How do I mount the 612965 lens on my Sony E camera and what step do people forget?

Align the white index on the lens barrel with the white dot on the camera mount, twist clockwise until it clicks, then remove the rear cap; many forget to set the aperture ring to the locked A position before shooting.

What maintenance will the 28-45mm F1.8 zoom need over time?

Clean the front element with a blower and microfibre cloth when dust appears; the inner zoom design limits internal dust entry, and the LA focus motor has no user-serviceable parts.

What limit appears first during long video takes at F1.8?

Focus breathing is minimised by design, but sustained wide-aperture recording can raise barrel temperature until the camera enforces a thermal shutdown.

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