Hi Simont, I agree it is strange, I would also be interested in knowing why this is.
However, it appears to occur on all the camera bodies they tested this lens with.
I was thinking it could be caused by any of the following reasons:
- -a very 'different' testing methodology by DxO (perhaps taking into account more vertical resolution than any other lens testing site)?
- -individual lens fault?
- -lens design
- -a measurement error by DxO (unlikely if it occurs on all camera bodies they tested)?
Note that the SLRGear test did not show any such behaviour:http://www.slrgear.com/reviews/showproduct.php/product/1443/cat/14
The Lenstip review linked to by Xzei showed f2.8 to be one of the highest resolution apertures:http://www.lenstip.com/316.4-Lens_review-Olympus_M.Zuiko_Digital_45_mm_f_1.8_Image_resolution.html
So there are some very different test results for this lens.