If you attach a 1.4x Extender to an EF 70-200mm f/2.8L IS III USM lens, for example, it will become in effect a 98-280mm f/4 lens. If you use the same lens with a 2x Extender, it becomes a 140-400mm f/5.6 lens. Has anyone tried sigma 35 art f1.4, canon 135 f2.0 and 70-200 f4 is ii. I've got one in the post and the first two lenses you mention will be amongst the first that I test out. I found the autofocus of the 135L using the regular Canon EF-EF-M adapter was only ok with my M50. If the focus was way off it would struggle to find focus. The Canon Extender EF 2x III is also quite small and light. By putting the Extender between your telephoto lens and the camera, you reduce the field of view and bring everything closer. A Canon EF 70-200 mm f/2.8 L IS III USM thus becomes a 140-400 mm f/5.6. It becomes even more spectacular with a super telephoto like the EF 400 mm f/2.8 L IS Canon EOS-1D X Mark II Canon EF 85mm F1.2L II USM Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F2.8L IS II USM Canon Extender EF 2x III +2 more ZX11 • Veteran Member • Posts: 6,156 A zoom as good as a prime lens. One of the finest telephoto zoom lenses in the EF line, optically comparable to a prime lens. Four UD-glass elements to correct chromatic aberrations and multiple zoom groups allow internal focusing, resulting in high image quality throughout the zoom range. Compatible with Extender EF 1.4x and 2x. . Question: Am I severely handicapping myself, resolution wise, by using a Canon 70-200 f2.8 II with a Canon 2x converter on my Canon 7d mark2? - Stephen S. [youtube Enthusiast. 02-23-2015 05:12 AM. Assuming you get the Canon 1.4x and the Canon 70-200 lens, they will work perfectly together. Consider spending the extra for the f/2.8, since you know you'll be using the extender. Losing a stop means your lens will start at f/5.6, which makes it very difficult to use indoors. EF 100mm f/2.8 MACRO USM. EF 200-400mm f/4L IS USM Extender 1.4x. ver mais. Extensor EF 2x III. ver mais. MP-E 65mm f/2.8 1-5x Macro Photo. It also has an extra stop of VC/IS, which is nice. Not to mention it costs 2/3 of what the Canon does. My only concern is the lenses performance when coupled with a 2x teleconverter. I've used the Canon 70-200 2.8 II IS with the 2x III Extender and it produced wonderful images wide open. I have two APS-C (70D and 600D) bodies with Canon EF and EF-s lenses, and Sigmas, among them the Sigma 70-200 f2.8 HSM OS. I am also considering getting the new Tamron 150-600 lens, pending reviews. I was just curious if a Canon extender, specifically the canon EF 2X III, will work on the Tamron and/or Sigma lenses.

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