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Message: <blockquote data-quote="Cristian Sorega" data-source="post: 40446" data-attributes="member: 838">The 15mm lens works very well, I did not see any colour shifts, only slight vignetting but setting the vignetting correction to +1 or +2 gets rid of it. It works much better on the GXR than the Epson RD1 or the GF1 I used it on before.So far I did not notice any IR problems on the pictures, not sure but the picture here could maybe answer your question: <a href="http://blog.kmem.org/2011/09/free-day-and-walk-around-bloomsbury.html">Tom's photography blog: Free day and walk around Bloomsbury</a></blockquote>