When used with a 82mm diameter wide-angle zoom lens, the lens corrects image aberration and distortion*. The lens helps reproduce clear images when mounted on a compatible lens for interchangeable lens cameras (full-frame SLR cameras).
* Field curvature and distortion are reduced by approximately 2 f-stops value.
Compatible with Canon EF 16-35mm F2.8L ll USM
Lens: 1 element in 1 group (AR-multi-coated on the both sides)
Dimensions (WxHxD): 85 x 8.4mm / 3.3 x 0.3 inches
Weight: 48g / 1.7oz
Construction: Optical glass (AR-multi-coated on the both sides) and corrosion-resistant aluminum alloy.