Sigma 17-40mm F1.8 DC Art (Canon RF-S) lens

Sigma 17-40mm F1.8 DC Art (Canon RF-S) lens

This is what you've been waiting for! The Sigma 17-40mm F1.8 is a fast zoom lens that produces image quality comparable to prime lenses for Canon APS-C sensor bodies like the Canon EOS R50. The speed is F1.8 throughout the entire focal length range! Canon does not manufacture any similar lenses themselves.

Sigma previously had a very popular 18-35mm F1.8 lens for mirrorless bodies, and this is designed to be its mirrorless successor. The weight has dropped by 30% compared to the mirrorless lens, and the focal length is now slightly wider and more reachable.

• Sigma's best Art series in terms of image quality
• Bright zoom for all your photo and video photography
• Fast and quiet HLA autofocus
• Fixed F1.8 aperture across the entire focal length range
• Internal focus and zoom, meaning the lens size does not change
• Programmable control ring for exposure compensation or aperture adjustment, for example
• Dust and splash resistant construction
• Made in Japan

The Sigma 18-35mm F1.8 was a unique lens and there is still nothing like it from other manufacturers, but now Sigma itself is making an updated and better version: the weight, mechanical quality, image sharpness and autofocus are clearly improved compared to the original.

The lens vignetches more than the previous model at full aperture, but fortunately this is easy to fix and many cameras take this into account directly, meaning that image processing is not required. And this is probably always a better option for most people as it also gives a sharper image and fewer image errors such as chromatic aberration. The sharpness of the image is also better at the very edges of the image, despite the fact that the focal length is slightly wider.

In addition, the focal length of 17-40mm is a great performance, every millimeter on the wide-angle end makes a visible difference, and now the longer reach on the telephoto end brings versatility. The cine equivalent focal length is about 27-64mm, which means that this basically replaces several fixed focal length lenses in one device in terms of brightness and image quality. The lens is a great choice for landscape photography, starry skies and twilight photography due to its brightness, and the telephoto end is also suitable for portrait photography.

If the lens is better than before, so are the cameras. Earlier lenses sometimes had trouble focusing completely correctly due to the short depth of field, but with the new mirrorless Canon bodies this problem does not exist because focusing is done at the sensor level and the focus points are located throughout the image area.

The Sigma 17-40mm will probably also be popular with videographers. The lens features Sigma's latest HLA focusing motor, which means it keeps up with the autofocus of Canon's new bodies. In addition, the so-called focus breathing phenomenon, which is annoying in video shooting, has been minimized.

The length of the lens remains the same when zooming from one extreme position to the other, meaning the package is very sturdy mechanically and there are no sliding tubes exposed where dust can get inside the optics. Because of this, the lens also feels a little smaller in the hand than the technical specifications would suggest! In addition, the center of gravity remains very similar, meaning this works well with gimbals despite its weight.

The Sigma 17-40mm F1.8 is versatile in terms of usability, meaning there are two programmable AF-L buttons on the front of the lens for activating the focus feature, for example, and this Canon RF-S version has a programmable control ring like Canon's own lenses.

The Sigma 17-40mm F1.8 is weather and dust protected to the same standard as the Art series.

Specifications:

• Compatibility: Canon RF-S mount
• Focal length: 17-40mm (equivalent to 27.2-64mm lens on APS-C bodies)
• Aperture: F1.8 (min. f/16)
• Construction: 17 elements in 11 groups, 11 rounded diaphragm blades
• Closest focusing distance: 28cm
• Filter thread: 67mm
• Size: 72.9mm x 115.9mm
• Weight: 560g