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Canon 200mm f2 L vs. 200-400mm f4 L

Started Sep 9, 2016 | Discussions thread
OP Ran Plett Senior Member • Posts: 1,051
Re: Canon 200mm f2 L vs. 200-400mm f4 L
1

NottsPhoto wrote:

yes, on your last point, adding the converter to the lens results in a noticable drop in sharpness. (but this is the mk1 and the mk2 converter.... so results may be better on the newer version) I can't see how adding more glass to the back of the lens would have anything but a bad impact...

otoh of course you have the other compromises with a crop chip... but at least there is no degradation of the basic image...

According to the-digital-picture, it seems that the 400 DO pairs well with the 1.4TC and / or 7D mkII. http://bit.ly/2eg5JOk

Looks like about equal, or close enough, at least to my eye. The good news is that the DO + 1.4 TC also works well on the 7DII so we're talking about an effective 900mm f8 of reasonable quality. And that looks just a touch better than the 400 DO + 2x TC, (800mm f8) which illustrates the extra glass issue that you were alluding to.

Mind you, in real world applications things may be different, and forgive me if so, I don't own that lens yet!

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