Sigma 17-40mm F1.8 DC Art
Sigma · 17–40 mm · f/1.8 · Art
Score Breakdown
Scores combine our editorial testing with published lab data.
73
SCORE /100
What We Like
+Constant f/1.8 aperture throughout entire zoom range - unique for APS-C zoom category
+Compact and lightweight (30% lighter than 18-35mm predecessor) despite fast glass
+Professional Art-series optics with prime-like optical performance and sharpness at f/1.8
+Video-optimized design with internal zoom, minimal focus breathing, and silent HLA autofocus
+Weather-sealed construction with dust/splash resistance and water/oil-repellent coating
+Versatile 17-40mm focal range (25.5-60mm equivalent) covering wide to standard coverage
Worth Knowing
−Some edge softness and fringing at wide aperture (f/1.8), especially at corners and in full-frame mode
−Limited zoom range compared to competitors - maximum of 40mm doesn't reach standard telephoto lengths
−Ghosting visible at wide aperture in backlit situations despite good flare control
−Not recommended for landscape/cityscapes due to edge performance limitations at wide angle
General | |
|---|---|
About This LensThe Sigma 17-40mm F1.8 DC Art is a well-crafted update to the popular 18-35mm F1.8 for APS-C mirrorless cameras, offering a broader zoom range and modern features with prime-like optical performance and excellent sharpness in the center, though it shows some softness at the edges. The lens boasts professional build quality with weather sealing, a smooth focus mechanism, and versatile video features, making it suitable for both photography and videography. At the time of writing, it is the world's largest-aperture standard zoom for APS-C mirrorless cameras. | |
| Brand | Sigma |
| Release Year | 2025 |
Production Status ⓘCurrent status of lens manufacturing (e.g., in production, discontinued). |  In Production |
Pro Branding ⓘSpecific branding codes used for professional-tier lenses. | Art |
Lens Mount ⓘThe lens mount will tell you what type of lens range you can fit onto the camera body. Often the same camera company will have different lens ranges for different cameras. | Canon RF |
System ⓘIndicates which camera system the lens is designed to attach to. | Canon EOS R |
Maximum Format ⓘLargest sensor size compatible with the lens. |  APS-C |
Physical86/100 | |
| Lens Weight | 535 g |
Lens Diameter ⓘWidth of the lens at its widest point | 72.9 mm |
Lens Length ⓘHow long the lens is from front to back. | 115.9 mm |
Front Filter Compatible ⓘSome lenses are compatible with front filters, some are compatible with back filters and some are compatible with both. Front filters are usually more convenient to add and remove. |  Yes |
Front Filter Size ⓘDiameter of attachable filters. | 67 mm |
Optics88/100 | |
Focal Range ⓘShortest to longest focal length of the lens (zoom range start - end ) | 17–40 mm |
Aperture Range ⓘLargest aperture at the lens's shortest focal length to longest focal length (aperture range start - end) | 1.8 |
| Focal Length Angle of View | 76.5°–37.1° |
Flange Focal Distance ⓘDistance from lens mount to sensor. | 20 mm |
Diaphragm Type ⓘStructure and design of the aperture |  Automatic |
Blades ⓘNumber of diaphragm blades in aperture | 11020 |
Zoom Lens ⓘZoom allows you to vary the focal length, change between long shots and close-ups |  Yes |
Zoom Mechanism ⓘSystem enabling zoom function |  Manual |
Zoom Ring ⓘIf zooming is adjusted using a zoom ring |  Yes |
Zoom Type ⓘThe design or approach to zooming |  Rotary |
Closest Focusing Distance ⓘMinimum distance for a subject to be in focus. | 28 cm01500 |
Maximum Magnification ⓘLargest size a subject can be reproduced | 0.21x |
| Autofocus Mode |  Yes |
| Manual Mode |  Yes |
| Manual Focusing Ring |  Yes |
Features32/100 | |
Weather Sealing ⓘWeather sealing capabilities will give you more confidence when shooting in unfavourable conditions. |  Yes |
Fluorine Coating ⓘCoating to repel water and oil from lens elements. | No |
| Built In Lens Hood | No |
| Lens Hood Type |  Petal |
Zoom Lock ⓘZoom lock allows the zoom ring to be locked at the desired focal length | No |
Teleconverter ⓘA teleconverter (extender) is an extra piece of equipment that fits between the lens and the camera body to enhance magnification | No |
| Image Stabilization | No |
Construction59/100 | |
Elements ⓘLens elements refer to individual pieces of glass within the lens. | 17 |
| Groups | 11 |
Aspherical Elements ⓘThe number of aspherical lens elements which can help correct aberrations such as spherical aberration. | 4 |
Bi Aspherical Elements ⓘElements with two non-spherical surfaces | 0 |
Low Dispersion ⓘElements that reduce chromatic aberration | 4 |
Super Low Dispersion ⓘAdvanced elements further reducing chromatic aberration | 4 |
CA Reduction ⓘBuilt-in features to reduce chromatic aberration | 0 |
Internal Focusing ⓘInternal Focusing means that the lens does not change in size during focusing, and the front element does not rotate. |  Yes |