An f/4 lens with a 2x mounted behind it becomes a rather-dark f/8 lens. For most of us, the disadvantage second only to the image quality degradation is the loss of 2 stops of maximum aperture. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 or 2 stops respectively. //End comment tag.-->, Bringing you this site is my full-time job (typically 60-80 hours per week). Powered by PerimeterX , Inc. Javascript is disabled or blocked by an extension (ad blockers for example). £185.00. Last one. TC2 = new Image(700,276) Hi, I have a Canon Lens EF 70-200mm L F4 USM. - Bryan, My Recommended Canon RF 2x Extender Retailers, As an Amazon Associate, I earn from qualifying purchases. The Canon RF 2x Extender features a brand new 9 elements in 5 groups optical design. Both available models of the hardware, the Canon 2x extender II and the Canon 2x extender III, are compatible with the same set of lenses, so there wont be any fussing over specifics regardless of the model youre interested in. When combined with pro level EOS cameras & EF supertelephoto lenses with image stabilization, near imperviousness to weather extremes is achieved thanks to rubber gasket seals. This black-crowned night heron proved the only living subject patient enough for me to make all of the lens changes necessary for a focal length comparison using the RF 600mm and RF 800mm lenses, the first two RF extender compatible lenses to hit the streets. or Best Offer. TC1a2 = new Image(656, 439) Used Canon Extender EF 2x II Get your Canon RF 2x Extender now! 3. Shares (Image credit: Canon) After debuting them in February, Canon has launched its Extender RF 1.4x and Extender RF 2x teleconverters for the EOS R family of cameras. That requires professional build quality. However, Canon recommends that the New FD 300mm f/2.8L to be used with the Extender FD 2X-B instead. Canon 2X III Extender Lens Adapter. Can anybody help me by informing that AF can work with EF 70-200mm L F4 USM + 2X extender mounted on 650D camera and how much picture quality I have to compromise for the same. Wait, you just noticed that my math is not correct for the zoom lens example. Buying an extender over a longer lens for financial reasons can make sense, especially as the very long focal length lenses are considerably more expensive than extenders. Renting is fast and easy. bigger. Our Used Stock. Planned is for this site's Image Comparison Tool to have with-extender results for all extender-compatible Canon RF lenses. I am grateful for your support! Or, would you feel more comfortable buying after having a hands-on trial period? A 2x turns an f/11 lens into an f/22 lens.