Extender 1.4ll vs 1.4lll

[Fab72]

Bonjour ja tous j
e vais acheter un extender 1.4 canon ma question ya t'il une différence entre la version 2 et la version 3

[tkosak]

Bonjour ja tous j
e vais acheter un extender 1.4 canon ma question ya t'il une différence entre la version 2 et la version 3

Tu écris avec des gros doigts sur un petit téléphone? 
Tu aurais plus de résultats, je pense, en ouvrant ce fil dans la section Canon, non?

[ChatOuille]

Je le pense aussi car moi c'est Nikon et là je dois dire que le 1.4 III est mieux que le II. Je peux imaginer que ce sera la même chose chez Canon.

[tidoud]

Oui il y'a une bonne différence, surtout sur la rapidité de l'AF.
Sans conteste je te conseil les versions III

[dioptre]

un avis que j'avais recopié de the-digital-picture :

Pour le x1,4 :
The image quality differences most easily noticed between the 1.4x II and the 1.4x III are: 
 
The 1.4x III has less barrel distortion than the 1.4x II. This makes the center-of-the-frame details slightly smaller in a comparison. This difference will be most noticeable in the top crop shown in the ISO 12233 chart tool. 
 
Anomalous dispersion glass elements are used in the Series III extenders to reduce chromatic aberration and increase resolution and contrast. The CA difference between the II and III is quite noticeable - pay close attention to this difference in the bottom ISO 12233 crops. 
 
Less noticeable are the resolution and contrast differences, but some comparison examples do show improvements. 
 
Contributing to the improved image quality is Canon's Super Spectra coating which reduces ghosting and flare. Front and rear elements have Canon's fluorine anti-smear coating - making them very easy to clean.
http://www.the-digital-picture.com/Reviews/Canon-Extender-EF-2x-III-Review.aspx
Pour le x2
The image quality differences most easily noticed between the 2x II and the 2x III are: 
 
Results with the Extender 2x III are overall slightly sharper than the Extender 2x II with a difference being most noticeable in the mid-frame and corner areas. The 2x II added pincushion distortion to the lens it was used with whereas the 2x version III adds slight barrel distortion. 
 
Anomalous dispersion glass elements are used in the Series III extenders to reduce chromatic aberration and increase resolution and contrast. The Extender 2x II did not have an issue with CA and neither does the III. 
 
The Extender 2x III has Canon's Super Spectra coating for reduced ghosting and flare. The front and rear elements have Canon's fluorine anti-smear coating - making them very easy to clean.