Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

Started 6 months ago | Discussions thread
Just another Canon shooter
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Re: Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2
In reply to knickerhawk, 6 months ago

knickerhawk wrote:

Remember, the reason I responded to Bob was to counter his criticism of Anders for not accepting at face value the "packaged" results from DXO. I think you and I are actually pretty much in agreement on the questionable value of DXO's scores.

So is Bob.

Your reference to the P-Mpix maps is just another example of how misleading the presentation of the DXO data can be. For instance, the information in the sharpness profile tab for the two lenses at f/2.8 for the Oly and f/5.6 for the Nikkor indicates that they perform quite similarly in the center (the Oly wins the horizontal measurement and the Nikkor wins the vertical and average of the two), but the Oly is better across the whole frame.

Those are "acutance maps", whatever that means, as a percentage of who knows what; instead of P-Mpix maps, whatever that means.

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Canon EOS 5D Mark II Canon EF 15mm f/2.8 Fisheye Canon EF 35mm f/1.4L USM Canon EF 50mm f/1.2L USM Canon EF 135mm f/2.0L USM +4 more
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