Jeff Nolten Offline Upload & Sell: Off
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I had emailed Chuck Westfall regarding any advantage of using the 1.4x III over the 1.4x II with the 100-400 II. Here is his reply:
Happy New Year!
As of now, I have not had the time to compare the image quality of the new 100-400 version II with 1.4X III vs. 1.4X II. However, our information from Canon Inc. in Japan does not indicate any special optical advantage for either version of the EF Extenders when used with EF zoom lenses. In fact, the only instance in which the Type III Extenders are stated to be a better optical match than earlier models occurs when the Type III Extenders are used with the IS II prime lenses from 300mm to 600mm. Based on that, plus my personal experience with the EF 1.4X II and III on other EF zoom lenses such as the 70-200/2.8L IS II, I wouldn't expect any significant difference in image quality for either of those extenders when used with the new EF 100-400mm IS II lens.
If you hear anything different, please let me know.
Best Regards,
Chuck Westfall
Advisor, Technical Information
ITCG Prof Bus Strategy Plan Division
This is good news for us owners of the 1.4x II converter.
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