5DIII and 100-400 Question

Started Jun 1, 2013 | Discussions thread
bhollis Veteran Member • Posts: 3,438
Re: 5DIII and 100-400 Question

qianp2k wrote:

5D3 works very well with bare 100-400L and AF fast.

I tried 5D3 and 100-400L with 1.4x TC III. It still AF OK under good light but its sharpness is noticeably worse and AF hung under poor light or impractical to track on fast moving subjects. It's not very practical in general to use TC with 100-400L.

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No real surprise that IQ suffers a little with the TC.  But here's the question:  AF issues aside, in focal length limited situations (which are common with wildlife shooting), do you get better IQ with the TC or shooting without the TC and cropping to the same fov you'd get with the TC.  I suspect it's the former.

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