Related on site: On a Sony a6700 (see our Sony a6700 piece), this is the first lens we'd add: it replaces the camera's slow kit zooms with a constant f/2.8.
Sigma 18-50mm F2.8 DC DN | Contemporary with its LH582-02 hood, zoom retracted. The mount version is not identifiable in this shot. Image: SIGMA Corporation
HIGHLIGHTS
Most APS-C cameras ship with a slow kit zoom, and the usual upgrade, an f/2.8 standard zoom, tends to cost and weigh far more than the body owners bought. Sigma's 18-50mm F2.8 DC DN, launched in 2021 at $549, takes a different approach. It's 290 grams and under eight centimeters long, roughly the size of the zoom it replaces, but it holds f/2.8 from 18mm to 50mm. On a crop-sensor body that's a 27–75mm-equivalent range, the same span full-frame shooters get from their bigger standard zooms.
That constant f/2.8 matters more than it might seem. You keep the same bright aperture at 50mm for portraits and indoor shots instead of dropping to f/5.6, so shutter speeds stay up and backgrounds soften. It focuses down to 12 centimeters at the wide end, close enough for food, flowers and small objects. The stepping motor is quick and near-silent, which helps on gimbals and for video. On a stabilized body like the Sony a6700, the lack of optical stabilization barely matters.
The compromises come from the size. The wide end stops at 18mm rather than the 16mm of some kit zooms, the barrel extends as you zoom, and only the mount is sealed against dust and splashes. There's no aperture ring or stabilization. If you shoot APS-C mirrorless and want one lens that stays on the camera, it's still the easiest upgrade to recommend, and Sigma now makes it for Sony E, Fujifilm X, L-mount and Canon RF.
Zoomed to 50mm: the barrel extends as you zoom. Mount version not identifiable. Image: SIGMA CorporationThe L-mount version on a SIGMA fp (a full-frame L-mount body). Not the Sony E version. Image: SIGMA AmericaThe Fujifilm X-mount version (announced November 2022). Image: SIGMA AmericaThe Canon RF-mount version (announced June 2024), Sigma's first RF lens. Image: SIGMA America
The story
Sigma announced the 18-50mm F2.8 DC DN | Contemporary on October 19, 2021, as its first zoom designed for APS-C mirrorless cameras, initially for Sony E and L-mount, at $549. DPReview's launch report called it "a fast upgrade from the standard kit zooms." Sigma billed it as the smallest and lightest F2.8 standard zoom for crop-sensor mirrorless, as of that date.
A Fujifilm X-mount version followed on November 14, 2022, also at $549, with AF-C support and a rubber-sealed mount. On June 25, 2024, Sigma announced a Canon RF version at $599 for mid-July delivery. It was Sigma's first RF lens, and on Canon's 1.6x crop it gives a 28.8–80mm equivalent range.
Five years on, it's still the standard compact f/2.8 option for APS-C mirrorless across four mounts. The prices above are launch prices; retail prices have moved since.
Specifications
Key verified specs for the Sigma 18-50mm F2.8 DC DN | Contemporary (C021), from Sigma's product page, SIGMA America press releases and DPReview. Source for each row in brackets.
Mounts / format
Sony E, L-Mount, Fujifilm X, Canon RF; APS-C (DC) [Sigma]
Equivalent range
27–75mm on APS-C (Canon RF: 28.8–80mm, 1.6x) [SIGMA America]
Optics
13 elements in 10 groups; 1 SLD, 3 aspherical [Sigma]
Angle of view
76.5°–31.7° (RF mount: 73.4°–30.0°) [Sigma]
Aperture
f/2.8 constant to f/22; 7 rounded blades [Sigma]
Min focus / max magnification
12.1 cm (wide) to 30 cm (tele); 1:2.8 (wide) to 1:5 (tele) [Sigma; DPReview]
Sony E: φ61.6 × 76.5 mm, 290 g · L: φ65.4 × 74.5 mm, 290 g · RF: φ69.2 × 74.5 mm, 300 g · X: φ61.6 × 76.8 mm, 285 g [Sigma]
Build / sealing
TSC polycarbonate barrel with some metal internals; dust- and splash-resistant mount (not called fully weather-sealed) [SIGMA America; DPReview]
Supplied
Hood LH582-02; caps LCF-55mm III and LCR II [Sigma]
Announced / launch price
Sony E and L: Oct 19, 2021, $549 · Fujifilm X: Nov 14, 2022, $549 · Canon RF: Jun 25, 2024, $599 [SIGMA America]
Sample galleries
Full-resolution sample images live on DPReview. Both galleries were shot on a Sony a6600 (APS-C, Sony E) with this lens, not on the a6700; EXIF reads ILCE-6600 with the Sigma 18-50mm F2.8 DC DN | Contemporary. Images credited to DPReview.
Official SIGMA sample images shot with this lens on Sony E APS-C bodies, credited to each photographer. More on SIGMA's product page.
Sample photo · SONY α6600 · 50mm, F4, 1/800s, ISO 100. Photograph: Damien Dohmen / SIGMASample photo · SONY α6600 · 50mm, F4, 1/500s, ISO 100. Photograph: Damien Dohmen / SIGMA
Sample photo · SONY α6500 · 28.4mm, F2.8, 1/200s, ISO 250. Photograph: Hsu Wu Te / SIGMASample photo · SONY α6600 · 40.5mm, F7.1, 1/1250s, ISO 400. Photograph: Jim Koepnick / SIGMA
Sample photo · SONY α6600 · 50mm, F5.6, 1/250s, ISO 500. Photograph: Jim Koepnick / SIGMASample photo · SONY α6500 · 18mm, F5.6, 1/400s, ISO 200. Photograph: Andrew Stripp / SIGMA
Launch prices (SIGMA America). Sony E and L-mount $549 (Oct 2021) · Fujifilm X $549 (Nov 2022) · Canon RF $599 (Jun 2024).
Verdict
This is the first lens to buy for an APS-C mirrorless body. A constant f/2.8 in a body the size of a kit zoom is hard to beat for travel, everyday shooting, low light and video, and the 12 cm close focus at the wide end adds real flexibility. You give up stabilization (minor on IBIS bodies like the a6700), the 16mm wide end of some kit zooms, an internal zoom and full weather sealing.
Sony a6700 owners in particular should look at it first: it uses the camera's subject-detect AF and IBIS well, and it keeps the setup small (see our Sony a6700 piece).
Pros
Constant f/2.8 across a 27–75mm-equivalent range
290 g and about kit-zoom size
12.1 cm close focus at the wide end
Quiet stepping motor; Sony E, Fujifilm X, L-mount and Canon RF versions
