Richard CanonNews / Sunday, November 12, 2017 / Categories: Lens Catalog Canon EF 400mm f/4 DO IS II USM Specifications for the Canon EF 400mm f/4 DO IS II USM Lens Category and Release Details Lens Mount TypeEF Lens CategorySuper-Telephoto Primes Launch DateSeptember, 2014 Initial Price$6,899.00 Lens Characteristics Diameter128mm Length233mm Weight1200g Filter Threadmm Rear Filter InstalledTrue WeathersealingTrue Focal Length400mm Number of Elements / Groups18/12 Maxiumum Aperture4.00 Minumum Aperture32.00 Minumum Focal Distance3.30m Number of Diaphragm Blades9 Purchase Links for the Canon EF 400mm f/4 DO IS II USM Canon USA Canon USA Refurbished Amazon B&H PhotoVideo Adorama Features Gapless Dual-Layer Diffractive Optics Large Diameter Aspherical Element Ultra Low Dispersion Element Protective Fluorine Coatings Ultrasonic AF Motor and Internal Focus Optical Image Stabilizer with 3 Modes Power Focus Mode; Full-Time MF Override Dust- and Water-Resistant Construction Rounded 9-Blade Diaphragm Previous Article Canon EF-S 24mm f/2.8 STM Next Article Canon EF 24-105mm f/3.5-5.6 IS STM Print 1161 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.