Richard CanonNews / Monday, November 13, 2017 / Categories: Lens Catalog Canon Extender EF 1.4x III Specifications for the Canon Extender EF 1.4x III Lens Category and Release Details Lens Mount TypeEF Lens CategoryExtender Launch DateAugust, 2010 Initial Price$449.00 Lens Characteristics Diameter72mm Length27mm Weight225g Filter Threadmm Rear Filter InstalledFalse WeathersealingTrue Focal Lengthmm Number of Elements / Groups7/3 Maxiumum Aperture Minumum Aperture Minumum Focal Distancem Number of Diaphragm Blades Purchase Links for the Canon Extender EF 1.4x III Canon USA Canon USA Refurbished Amazon B&H PhotoVideo Adorama 1.4x Magnification Factor Microcomputer Controlled Communication Between Lens & Camera Spectra Coating Reduces Ghosting/ Flare Protective Fluorine Coating Dust and Water Resistant Compatible with Select EF Mount Lenses Previous Article Canon Extender EF 2x III Next Article Canon EF 8-15mm USM Fisheye Print 1671 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.