Richard CanonNews / Friday, March 7, 2025 / Categories: Lens Catalog Canon RF-S 7.8mm F4 STM Dual Specifications for the Canon RF-S 7.8mm F4 STM Dual Lens Category and Release Details Lens Mount TypeRF-S Lens CategoryDual Fisheye Launch DateOctober, 2024 Initial Price$449.00 Lens Characteristics Diameter69mm Length42mm Weight131g Filter Thread58mm Rear Filter InstalledFalse WeathersealingFalse Focal Length8mm - 8mm Number of Elements / Groups9/7 Maxiumum Aperture4.00 Minumum Aperture Minumum Focal Distance0.15m Number of Diaphragm Blades7 Purchase Links for the Canon RF-S 7.8mm F4 STM Dual Amazon B&H PhotoVideo Adorama MTF Plot of the Canon RF-S 7.8mm F4 STM Dual Lens Construction Diagram of Canon RF-S 7.8mm F4 STM Dual Previous Article Canon RF 50mm F1.4 L VCM Next Article Canon RF 16-28 F2.8 IS STM Print 136 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.