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EF 400mm f/5.6L USM image quality

Started Jul 1, 2021 | Questions thread
Dave
Dave Veteran Member • Posts: 6,231
Re: EF 400mm f/5.6L USM image quality

Octopuss wrote:

So I tried a different sample somewhere and sure enough, it focuses pretty much instantly, and in the case of completely blurry starting point in about a second.

I am absolutely perplexed what might be wrong with a lens that looks pretty much like it was bought a week ago.
Any ideas? The eletronics inside maybe?

Either way the seller agreed to take it back, fortunately.

Glad to hear that.  Outside appearance sometimes belies inside performance.

 Dave's gear list:Dave's gear list
Canon EOS 80D Canon EF 135mm F2L USM Canon EF-S 17-55mm f/2.8 IS USM Canon EF 100mm F2.8L Macro IS USM Canon EF 70-300mm f/4-5.6L IS USM +10 more
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