Richard CanonNews / Thursday, March 6, 2025 / Categories: Lens Catalog Canon RF 400mm F2.8L IS USM Specifications for the Canon RF 400mm F2.8L IS USM Lens Category and Release Details Lens Mount TypeRF Lens CategorySuper-Telephoto Primes Launch DateApril, 2021 Initial Price$11,999.00 Lens Characteristics Diameter168mm Length367mm Weight2890g Filter Thread52mm Rear Filter InstalledTrue WeathersealingTrue Focal Length400mm - 400mm Number of Elements / Groups17/13 Maxiumum Aperture2.80 Minumum Aperture32.00 Minumum Focal Distance2.50m Number of Diaphragm Blades9 Purchase Links for the Canon RF 400mm F2.8L IS USM B&H PhotoVideo Adorama MTF Plot of the Canon RF 400mm F2.8L IS USM Lens Construction Diagram of Canon RF 400mm F2.8L IS USM Previous Article Canon RF 600mm F4L IS USM Next Article Canon RF 100mm F2.8L Macro IS USM Print 62 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.