5 YEAR WARRANTY. Push your high-performance Canon EOS Lenses even further, with the help of this Canon EF Extender 1.4x III. For increased telephoto performance this extender magnifies your existing focal range by 1.4x, bringing distant objects closer and helping you to fill your frame with excitement. Designed for use with select L series Please view our accessory compatibility chart for a detailed list of the accessories that are compatible with either your EOS camera or EF Lens. Applicable Models EF-M 15-45mm f/3.5-6.3 IS STM With the 2X extender in place, even a 1DX III will not AF with using the normal AF system with that particular lens. With your 7D, AF won't work with the 1.4X either because the aperture rises beyond the f5.6 capability of the 7D as soon as you add an extender. Once your 100-400 is zoomed out to the f5.6 region, it is at the aperture limit of

Canon EOS 5D Mark III (with firmware version 1.2.1) Centre cross-type AF point. Canon 5D IV Up to 61 AF points. Canon Lens Compatibility. Guide to Canon DSLR Range.

And I second Ernie's recommendation. The 1.4X works well with several lenses, I wouldn't bother with the 2X. I have had a 1.4X II for several years and my 70-200 f2.8 IS III came with a 1.4X III as part of a promotion; I really can't see any difference between the results from the II and III. As to
This is straight from the manual. The TS-E 17mm F/4L IS NOT COMPATIBLE with any of Canon's teleconverters. All of their TS-E lenses are INCOMPATIBLE. -Demetrius. Current Gear: EOS 5D Mark IV, EF F/2.8 Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT. Retired Gear: EOS 40D. 1 Like.

Refer to the camera and lens instruction booklets to see if there are any AF compatibility limitations. The maximum aperture is indicated in half-stop increments. Maximum Aperture with the Extender When Extender EF1.4X III is attached, the lens maximum aperture will be smaller (darker) by 1 stop.

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    • canon extender ef 1.4 x iii lens compatibility