Dustproof and waterproof specifications (JIS 2 equivalent) Lens placement and coatings are optimized to minimize the ghosting. Built-in microcomputer in the extenders enables communication between lens, extender and camera. Anti-smear coating (Silky Barrier Coating) used to enhance smear-free state of the lens surface. Specification. These samples were all shot from the same position with a Canon L 100-400mm and an old Vivitar 500mm mirror lens. The first 4 are from the Canon, the first two are without the extender and the second two with. The final four follow the same sequence with the Vivitar. I'm convinced the extender isn't what I need. Agree, it is not a good marriage. A tel-con is almost always a bad idea and or just a Band-Aid solution. Almost any native FL tele will be better in all regards. There are a few exceptions but very few and they are all the 1.4x tel-con not the 2x. Yes, the EF 2X III extender is compatible with the EF 70-200mm f/2.8L IS USM. As previously noted, the optics can degrade image quality. AF speed and accuracy can take a hit, too. But, your actual performance will also greatly depend on the camera body that you are using. 72.0x 52.7. Weight (g) 325. Designed to extend a lenses focal length by a factor of 2x, the redesigned Canon Extender EF 2X III delivers optical performance on par with the finest Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and extender, features careful lens placement Lens: Focal Length & Maximum Aperture: EF1.4X III: EF2X III: EF 135mm f/2L USM: 189mm f/2.8: I think mine is a Mk II and for what its worth it is one of the few applications where I think a 1.4x tel-con is a good idea. I don't like the 2x which I wasted money on buying one years ago and never use and never recommend anyone else buy one. Oh, I have the Mk II lens. I think either one will wor Re: Canon Extender 1.4x III with Sigma 150-600. In reply to John Sheehy • Aug 10, 2021. My answer still stands, the 5d4, tc 1.4 v3 and the 100-400 give poorer results than the straight 5d4 and the 100-400 then cropped. Yes, the combination does tracking flying objects and they arena focus but lack detail. EMZ5DDO.

canon ef 2x iii extender lens compatibility