There is this compatibility chart for the 1.4X extender III: Canon Extender EF 1.4x Compatibility Chart. It is most definitely compatible with the F4 70-200 lens (I used to use this lens myself before upgrading to the 2.8). Image quality with the Canon is really quite good, and AF wasn't really affected too much. OP. Of course, the entire family of Canon super telephoto lenses (and all lenses listed in the table above) are compatible with the external extenders – the Canon Extender EF 1.4x III and the Canon Extender EF 2x III. Extenders have no effect on the minimum focus distance of a lens, but they do increase maximum magnification by their 1.4x or 2.0x The Sigma APO 1.4x tele-extender is a perfect companion for this lens, converting it from F3.4 to 280mm F5. The image remains outstanding, and the focal length range is ideal for wide angle astrophotography of extended objects. I have used this tele-extender with equally good results on a Pentax SMC 135mm lens, and TSAPO65Q and TSAPO100Q Other Teleconverters. Canon Extender EF 2x III - Pros & Cons. Closeup performance was similarly appealing. image quality holds up very well. image quality from the Mark IIIs are better than their predecessors. this is quite a nice boost in flexibility. build quality The build quality is excellent. 5.0. (2) Canon FA-DC67A Lens Filter Adapter. Attaches directly to the front of the camera's lens, allowing the use of 67mm optical filters. £ 30.99. Eligible for free delivery. Add to basket. Add to wishlist. Connect your EF lens to your new EOS R system camera with a specially designed lens adapter for the EOS R range. With a mirrorless camera like the Canon EOS R I have no problems using an insane combination of Canon EOS R, EF Control Ring Adapter, Extender EF 1.4x II and Extender EF 2x II, giving the equivalent of a 170-1,700mm f/12-16 lens! This crazy combo isn't the fastest at autofocus, but it still works and is easy enough to hand-hold: Canon EOS R5 Canon EOS R6 Canon EF-S 60mm f/2.8 Macro USM Canon Extender EF 1.4x III Canon Extender EF 2x III +10 more Reply Reply with quote Reply to thread Complain .

canon extender ef 2x iii compatible lenses sigma