Extender canon; II vs III

“ agzzi io aveso la serie II ora ho la serie III e l'autofocus anche se di poco è più veloce „

“ c'è un confronto fra il sigma 2x (direi uguale al canon serie II)vs il canon serie III "https://www.juzaphoto.com/topic2.php?f=24&t=61176&show=1&titolo=Recensione_Sigma_120300_Os_Ex_Dg_Hsm" ti garantisco che non appena ho aperto i raw volevo buttare via il sigma „

“ ...The 300 f/2.8 IS II and 400 f/2.8 IS II were the first two such lenses to hit the streets, so the potential with-extender performance from this lens was of particular interest to me. In the lab, the image quality results from 300 f/2.8 IS II lenses with extenders mounted are very, very impressive. This might be the best-with-extender-performing Canon lens available at review time - you are going to like what you see.

On the Canon EF 300mm f/2.8 L IS II USM Lens, the 1.4x III very slightly reduces wide open image sharpness and contrast, and increases barrel distortion slightly. Stopping this combination down changes the results very little. The sharpness fall-off with the 2x III is more noticeable than with the 1.4x III and some increased CA is visible, but little distortion is added with this extender. An f/8 aperture delivers a noticeably sharper image than f/5.6 when the 2x extender is in place.

Note that the Canon USA press release does not specifically say that the series III extenders would deliver better image quality (though features were added that could) - but that they would deliver better AF performance. Although the AF improvement will not result in better than the optical capability of the lens-plus-extender combination, better AF performance does indeed deliver better image quality overall.

The with-extender III autofocus performance I am experiencing from the 300 IS II is excellent. It is hard to tell that the extender is even there in regards to AF. I am quite pleased with the with-extender action sports image quality I am getting from this lens.

Note that Canon Europe CPN has stated "To get the best out of the new lenses and the Mark III extenders photographers must ensure they attach the extender to the lens first, before attaching the whole unit to the camera. This ensures that the combined lens information is transmitted correctly to provide the optimum image quality and focus performance." ... „

“ Note that Canon Europe CPN has stated "To get the best out of the new lenses and the Mark III extenders photographers must ensure they attach the extender to the lens first, before attaching the whole unit to the camera. This ensures that the combined lens information is transmitted correctly to provide the optimum image quality and focus performance." ..."
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