Focal Length & Maximum Aperture. Built-in extender at 1x: 200-400mm, 1:4.0. Built-in extender at 1.4x: 280-560mm, 1:5.6. Lens Construction. Built-in extender at 1x: 25 elements in 20 groups (incl. 1 rear filter) Built-in extender at 1.4x: 33 elements in 24 groups (incl. 1 rear filter) Diagonal Angle of View. The Canon EF 2x II Extender is an easy and very affordable way to dramatically extend the reach (focal length) of compatible Canon L Series lenses (and a few additional lenses). This review will sound very similar to the Canon 1.4x Extender Review, but the 2x function is basically the same. Lens Description: This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, 70-200 f/4.0L IS USM, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it\'s mounted to and Camera / Extender Compatibility Chart for the EF 200-400mm f/4L IS USM Extender 1.4x Extender Model: 1.4x II: 2x II: 1.4x III Please check the Canon website
4. Equipment: Canon EOS 1D -X Mark II. Canon EF 300mm f/2.8L IS II USM Lens. Canon EF 2x III Extender. Canon Extension Tube EF25 II. We finally managed to try the extender with another lens and had exactly the same problem. However we then borrowed another Canon 1D body and it worked perfectly! So the issue is clearly with the Canon 1DX ii body
The Canon 2x lens extender doubles the focal length of a lens, making (for example) a 200mm lens function as a 400mm lens. Canon 2X Extender EF II ~$320 Canon 2x Extender EF III User Reviews. 3EzRg.
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    • canon extender ef 25 ii