Extender EF 1.4x III compatible with EF mount? in Camera Accessories 12-18-2023; EOS Rebel T7 Adapter needed for older telephoto lenses in Camera Accessories 12-14-2023; New RF 200-800mm f/6.3-9 IS USM telephoto lens availability in EF & RF Lenses 12-14-2023; EOS Rebel T6 Extender and Lens Recommendations in EF & RF Lenses 12-10-2023 A lens extender is an adapter lens that fits between the camera body and the lens and extends the focal length of the lens. While maintaining the lens’s high optical performance, the Extender EF1.4X II increases the focal length by 1.4 times and Extender EF2X II doubles the focal length. Both Canon extenders feature the same exceptional EF 55-200mm f/4.5-5.6 USM : EF 55-200mm f/4.5-5.6 II USM : EF 135mm f/2L USM: EF 50mm f/2.5 Compact Macro : EF 100-400mm f/4.5-5.6L IS USM : EF 28-300mm f/3.5-5.6L IS USM : EF 180mm f/3.5L Macro USM: EF 24mm f/2.8 : EF 35mm f/1.4L USM : EF 70-300mm f/4.5-5.6 DO IS USM : EF 17-35mm f/2.8L USM: EF 85mm f/1.2L USM : EF 75-300mm f/4-5.6 III USM Canon 600mm F4 lens hood problem EF & RF Lenses. Found a lens that got lost EF & RF Lenses. EOS Rebel T7 Long exposure shot EOS DSLR & Mirrorless Cameras. I have a question I hope someone can answer for me. I have the Canon R camera. I found a good deal on a used EF 600 older lens. Can I put on my R to EF lenses converter, About the Canon EF 1.4x III Extender. Get some extra versatility from your telephoto L-Series lens with this precision-designed 1.4X extender. Your 300mm lens, for example, will gain 40% more reach, with a resulting focal length of 420mm (on full-frame cameras) or 672mm (on APS-C sensor cameras) once this extender has been placed in the light path. Like all 2× teleconverters, it doubles the lens' focal length, at the expense of losing two stops of speed (doubling the f/number). The RF 100-500mm f/4.5-7.1 L IS becomes a 600-1,000mm f/11-14 L IS (oddly it only works with the 100-500 set from 300-500mm). The RF 600mm f/11 IS becomes a 1,200mm f/22 IS. The RF 800mm f/11 IS becomes a 1,600mm I shoot 7D with 100-400mm lens and 70-200mm F/4 lens. I have used 100-400 with EF 2.0 III extender. Under the right condition I can auto-focus fine using Live Mode. I do have all focus options programmed in, but I normally use SPOT focus mode with these lenses. I do switch to the other focus mode depending on occasion. You guys are awesome, thank you very much for your input. Waddizzle that's exactly what I needed to know👍🏻 " you're asking the wrong question " fOH6fBp.