Richard CanonNews / Sunday, November 12, 2017 / Categories: Lens Catalog Canon EF 20mm f/2.8 USM Specifications for the Canon EF 20mm f/2.8 USM Lens Category and Release Details Lens Mount TypeEF Lens CategoryWideangle Primes Launch DateJune, 1992 Initial Price$539.00 Lens Characteristics Diameter78mm Length71mm Weight405g Filter Thread77mm Rear Filter InstalledFalse WeathersealingFalse Focal Length20mm Number of Elements / Groups11/9 Maxiumum Aperture2.80 Minumum Aperture22.00 Minumum Focal Distance0.25m Number of Diaphragm Blades6 Purchase Links for the Canon EF 20mm f/2.8 USM Canon USA Canon USA Refurbished Amazon B&H PhotoVideo Adorama Aperture Range: f/2.8-22 Aspherical and Super UD Elements Ultrasonic Autofocus Motor Floating Rear Focusing System Manual Focus Override Metal Filter Ring and Lens Hood Mount Truly Circular Diaphragm Minimum Focus Distance: 9.8" 72mm Filter Thread Diameter Previous Article Canon EF 100mm f/2.0 USM Next Article Canon EF 85mm f/1.8 USM Print 1658 Richard CanonNewsRichard CanonNews Richard has been using Canon cameras since the 1990s, with his first being the now legendary EOS-3. Since then, Richard has continued to use Canon cameras and now focuses mostly on infrared photography. Richard is the founder and editor of CanonNews since 2017, and has worked as a writer on CanonRumors and other websites in the past. Other posts by Richard CanonNews Contact author Facebook page Please login or register to post comments.