Richard CanonNews / Friday, March 7, 2025 / Categories: Lens Catalog Canon RF-S 3.9mm F3.5 STM Dual Fisheye Specifications for the Canon RF-S 3.9mm F3.5 STM Dual Fisheye Lens Category and Release Details Lens Mount TypeRF-S Lens CategoryDual Fisheye Launch DateJune, 2024 Initial Price$1,099.00 Lens Characteristics Diameter112mm Length55mm Weight290g Filter Threadmm Rear Filter InstalledTrue WeathersealingFalse Focal Length4mm - 4mm Number of Elements / Groups11/8 Maxiumum Aperture3.50 Minumum Aperture16.00 Minumum Focal Distance0.20m Number of Diaphragm Blades7 Purchase Links for the Canon RF-S 3.9mm F3.5 STM Dual Fisheye Amazon B&H PhotoVideo Adorama MTF Plot of the Canon RF-S 3.9mm F3.5 STM Dual Fisheye Lens Construction Diagram of Canon RF-S 3.9mm F3.5 STM Dual Fisheye Previous Article Canon RF 35mm f/1.4 L VCM Next Article Canon RF 28-70mm f/2.8 IS STM Print 135 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.