17-40 mm problem

Started Sep 6, 2012 | Discussions thread
x-vision Senior Member • Posts: 1,227
Re: 17-40 mm problem

Peter Vit wrote:

Before I send the lense to the lab, what can this be?

Before sending the lens to the lab, consider visiting a review site or two ;).

For example, http://www.photozone.de/canon_eos_ff/427-canon_1740_4_5d?start=1
Here's what they found about the resolution of this lens at 17mm (on the 5DII):

  • The center and even the border performance is very high here but there isn't really anything left deserving the word "resolution" in the extreme corners at f/4 and f/5.6.

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