You are 3.5 years too late and the good advice given at the time contradicts yours. An EF 300/2.8 L gains IQ through either teleconverter. The EF 2x does reduce effectiveness of AF, but it can still deliver keepers. The big superzooms can't deliver competitive IQ and the f6.3 aperture will affect AF as much as the 2x does on the 300/2.8. 340mm f/5.6 1/200s ISO 1000. Crab Picture. A crab comes out of its hole in the sand. This picture was taken at night. Lighting was a flash fired into a reflector. 400mm f/11 1/250s ISO 400. Slalom Waterski Start Picture. A slalom waterskier begins his ride in a spray of water. 400mm f/6.3 1/2000s ISO 200.
If I recall correctly, TC's will AF on the 7D as long as the combined aperture doesn't exceed f/5.6. Example. 70-200mm f/2.8 + 1.4 equals f/4 and therefore should work. riknash's gear list: Canon EOS 7D Mark II Canon EOS 5D Mark IV Canon EF 24-70mm F4L IS USM Canon EF 200-400mm f/4L IS USM Extender 1.4x HTC One.
Canon Extender EF 2X III is designed for select Canon L-series telephoto lenses to improve shooting performance. This extender is EF mount compatible. It is the perfect device for extending the focal length of the lens by 2x. Even though you can achieve your desired focal length extension, you need not worry about the image quality compromise Canon Extender EF 2x III. Canon. Extender EF 2x III. Ammattitasoinen polttovälin muuttaja, joka lisää L-sarjan objektiivien polttovälin kaksinkertaiseksi.
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Newer Mirrorless cameras with DPAF perform quite fast with the EF 100-400mmL II lens and you can use the extenders now with these new model cameras and still have full AF performance, even with the 2x Extender. The EF 1.4x III extender is quite snappy (fast) on any of the DSLRs with DPAF sensors and can be a useful accessory for birders and o34A5b.
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    • canon extender ef 2x iii sample images