Sigma 18-50mm f/2.8 DC DN | C review: Sigma's first Canon RF lens is a hit

After 6 years, the Sigma 18-50mm f/2.8 DC DN | C is Sigma's first Canon RF lens – and the wait has been worth it

Sigma 18-50mm f/2.8 DC DN | C in Canon RF mount, on a wooden surface against a dark background, moodily lit
(Image: © James Artaius)

Digital Camera World Verdict

Sigma's first RF lens has finally arrived on Canon's mirrorless platform – and the Sigma 18-50mm f/2.8 DC DN | C has been worth the wait for those using APS-C bodies like the R7, R10, R50 and R100. This pocket-sized powerhouse is an impressive performer – though as with the existing E-mount version, there is a heavy reliance on in-camera correction. With its constant f/2.8 aperture, ninja-like focus and weather sealing, this 29-80mm equivalent zoom virtually gives APS-C shooters a standard trinity lens – one that's about the size of a small tin of soda. This is a must-have for APS-C EOS R users.


  • +

    Constant f/2.8 aperture

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    Extremely compact size

  • +

    Great center sharpness

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    Weather sealed


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    No image stabilization

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    Middling edge sharpness

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    Moderate fringing

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    Relies on camera correction

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The Sigma 18-50mm f/2.8 DC DN | C (for Contemporary) is, first and foremost, Sigma's debut lens for the Canon RF mount. Without going into all the politics, I've waited six years for my first RF Sigma lens and the wait has been worth it – provided you're an APS-C user.

That's because the Sigma 18-50mm f/2.8 DC DN | C is specifically an RF-S lens. Which means that, while you can use it on full-frame EOS R cameras in crop mode, it has been designed for APS-C bodies like the Canon EOS R7, R10, R50 and R100

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Mount optionsCanon RF-S (also available for Sony E, Fujifilm X and L-Mount)
35mm equivalent focal length 28.8-80mm
Image stabilizationNo
Weather sealingYes
FocusAuto, manual
Control ringYes
Lens construction13 elements in 10 groups
Aperture blades7
Angle of view73.4 - 30.0°
Minimum aperturef/22
Minimum focus distance121 - 30m
Maximum magnification1:2.8 - 1:5
Filter size55mm
Dimensions (len x dia)69.2 x 74.5mm
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FeaturesA constant f/2.8 aperture and weather sealing – but no stabilization, switches or buttons.★★★★
DesignSmall, sleek and supremely lightweight – perfect for smaller bodies.★★★★★
PerformanceSome optical foibles aside, this is a fast aperture, fast focusing lens with great IQ.★★★★
ValueA standard trinity lens for under 500 bucks? This is great value!★★★★★

The Canon RF-S 18-45mm f/4.5-6.3 IS STM offers a very similar focal length in a much smaller, cheaper package that also has image stabilization. However, the aperture is slower and variable and there is no weather sealing. 


While it's a full frame lens, the Canon RF 24-50mm f/4.5-6.3 IS STM will mount on an APS-C camera and again provides a similar focal length. It has all the same pluses and minuses as the RF-S 18-45mm, except that it is physically bigger. 

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James Artaius

The editor of Digital Camera World, James has 21 years experience as a journalist and started working in the photographic industry in 2014 (as an assistant to Damian McGillicuddy, who succeeded David Bailey as Principal Photographer for Olympus). In this time he shot for clients like Aston Martin Racing, Elinchrom and L'Oréal, in addition to shooting campaigns and product testing for Olympus, and providing training for professionals. This has led him to being a go-to expert for camera and lens reviews, photo and lighting tutorials, as well as industry news, rumors and analysis for publications like Digital Camera MagazinePhotoPlus: The Canon MagazineN-Photo: The Nikon MagazineDigital Photographer and Professional Imagemaker, as well as hosting workshops and talks at The Photography Show. He also serves as a judge for the Red Bull Illume Photo Contest. An Olympus and Canon shooter, he has a wealth of knowledge on cameras of all makes – and a fondness for vintage lenses and instant cameras.