On the 1Ds mkIII, there's just slightly more distortion, with a maximum result of +0.25%.Ĭanon employs its Ultrasonic Motor for autofocus, and the results are near-silent and very quick. The 35mm ƒ/2 IS USM does fairly well to restrict distortion, showing a consistent +0.2% barrel distortion in the corners when mounted on the Canon 7D.
On the full-frame 1Ds mkIII however, it's more significant: at ƒ/2 light falls off to make the extreme corners more than a full stop darker than the center. At any other setting, light falloff is insignificant.
This CA is evident in this lens, showing as magenta fringing on areas outside the plane of focus, but its not as prevalent as older fast lenses we have tested.Ĭorner shading isn't really a problem on the sub-frame Canon 7D, with the only noteworthy results being extreme corners that are 1/3EV darker than the center, when set to ƒ/2. The Canon 35mm ƒ/2 provides a very good level of resistance to chromatic aberration, and it's fairly constant across the range of apertures (if you see it, you'll see it in the corners in areas of high contrast).Īlso noteworthy is a low amount of longitudinal chromatic aberration, which is typical of very fast lenses. Mounted on the subframe Canon 7D, performance for sharpness is very similar, though much more forgiving at the ƒ/2 setting. This performance continues through to ƒ/8, and diffraction limiting begins to set in at ƒ/11, but you don't see the impact of this until ƒ/22, where a generalized softness begins to descend upon the image. Stopping down to just ƒ/2.8 provides a significant increase in corner sharpness, but not quite as dramatic as that found at ƒ/4, where it's not quite tack sharp, but as close as close gets. For isolating a subject this is actually quite good, but if you want corner to corner sharpness you will need to stop down significantly. Mounted on the full-frame Canon 1Ds mkIII, the lens produces images with a sharp center but significantly soft corners when used wide open at ƒ/2. The Canon 35mm ƒ/2 IS USM produces sharp results, even when used at its wider apertures, though it must be stopped down for maximal sharpness. We'd like to thank for sending us this lens to test. The lens takes 67mm filters, and is available now for approximately $600. The lens ships with front and rear caps, but the EW-72 lens hood is optional.