EF 100-400 II vs. EF 70-200 f2.8 III + 2x ext

Started 2 months ago | Discussions thread
KevinRA Regular Member • Posts: 364
Re: To: MirceaG - followup reply...

Marco Nero wrote:

MirceaG wrote:

My question is how would a 70-200 f2.8 at 400mm (with 2x III) compare with 100-400 (with no extenders) in terms of quality of the picture.

The two lenses have a slightly different numbers of glass element in their lens array.
The 70-200mmL III has 23 elements. The 100-400L II has 21 elements.
.
I think that adding an extender (which immediately changes the f/stop on both lenses) will also have to affect image quality due to less light and additional glass being applied between the lens and the sensor of each camera. How much image degradation is likely to be different on each lens but I'm not sure anyone could quantify this. I have read here on Dpreview by other photographers that the 70-200mmL III lens at 400mm (after the 2x III Extender is applied) is not as clean as an image taken with the 100-400mmL II lens with NO extender at the same 400mm focal length. What the images looked like is anyone's guess because I have seen no samples.

Example here - OK could be some user error or miscalibration - but what I got with 70-200mm II + 2X TC III on a 7D2 and some post processing... Pine Grosbeak in Finland.

70-200 2.8 II was razor sharp for me with the 1.4X and bare.  The 300 2.8 II is the only lens I own which gives stunning results on high density sensors and the 2X TC - like 7D2 and 5DSR.

YYMV

 KevinRA's gear list:KevinRA's gear list
Canon EOS 5DS Canon EOS 5DS R Canon EOS 5D Mark IV Canon EF 200mm f/2.8L II USM Canon EF 100mm F2.8L Macro IS USM +8 more
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