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

Started Jun 16, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

Just another Canon shooter wrote:

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.

If that's so, why does he cite them when asked for evidence to substantiate his "theory"?

And why doesn't he have anything but an ad-hominem attack to offer in response when appropriately criticized for his choice of data?

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.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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