By this we mean that it will be able to project an image that's just over twice as bright onto a sensor that's slightly less than half the area, meaning the same total amount of light is used to capture the image. I currently own three that follow this “rule”), and the understanding was that the physics of building a zoom lens with a larger aperture than f/2. Overall the Sigma seems extremely promising and I've been pretty pleased with the results I and my colleagues achieved with it.

Sigma 210306 18-35mm F1.8 DC HSM Lens for Nikon - Black Sigma 210306 18-35mm F1.8 DC HSM Lens for Nikon - Black

In terms of aesthetics, the Sigma 18-35mm looks fantastic; its matte black paintwork teamed with silver and white detailing resembles that of a ‘Stealth fighter’ jet and it just oozes high build quality. DC HSM turns in an exceptional performance in our studio tests, in essence matching a selection of high quality primes. is an affordable lens with fantastic “Sigma Art” image quality, sharpness, and performance when shooting video on the Canon EOS R5. The Sigma 18-35mm feels like two or three prime lenses in one variable zoom, which makes it a great all-around video lens.

lens on a crop camera at ISO 1600 is *equivalent* to shooting the exact same scene with a 38mm f2 lens on FF camera at ISO 4000.

Sigma 18-35mm f/1,8 DC HSM Art Review - Lensora Sigma 18-35mm f/1,8 DC HSM Art Review - Lensora

The handling of the lens is also superb, although that can depend on whether you are comfortable with a reverse rotation of the focus ring. Introduction As with the 35mm prime, this new model is one of the firm’s new Art series lenses challenging Canon’s L-series and the similar ED lenses from Nikon for optical quality.Chromatic aberrations are quite well controlled, and while the lens has the Developed with the maximum emphasis on artistic touch, they are designed to meet the expectations of users who value a creative, dramatic outcome above compactness and multifunction. DC HSM | Art (near enough to production to take publishable photos with, far enough away that we can't review it), it's clear that it is possible.