The Digital Lens Optimizer is also available for images shot with an extender attached to a compatible lens. You cannot use the Digital Lens Optimizer with multiple-exposure RAW images created on the camera. EF cinema lenses (CN-E lenses) are not compatible.
I would not even consider the 2x tel-con on any lens. I currently own the 1.4 II tel-con and can say it works very well on the ef 70-200mm f2.8L lenses. I am not sue but I don't think I had the version II extender when I had my original ef 70-200mm f2.8L zoom but I don't see why it would not work on it.
Physical differences. Since the introduction of the 800mm f5.6, Canon changed their off-white color of their telephoto lenses. All the new MKII IS super-tele lenses from Canon feature this new coloring so the MKIII extenders have been updated to match both the color and also the very slightly smoother design aesthetic of these lenses.
EF 28-90mm f/4-5.6 II : EF 28-90mm f/4-5.6 III : You can also correct RAW images taken with the compatible lens even when the extender is attached.
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The EF - GFX Expander 1.26x allows Canon EF mount lenses to be mounted on Fujifilm GFX camera bodies without getting dark and / or soft corners. The magnification factor of 1.26x perfectly matches the image circle of the full-frame Canon EF lenses to the medium-format sensor of the GFX series cameras, and therefore the diagonal field-of-view
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canon extender ef 1.4 x ii lens compatibility
