Resolution of M43 lenses

Started Mar 31, 2013 | Discussions thread
Anders W
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Re: Demonstration of Differences in DxO Geometric Corrections
In reply to Detail Man, Apr 2, 2013

Detail Man wrote:

The DPR Gallery Originals of the images displayed below are full sized 16 Mpixel loss-less JPGs. Here is a synthetically created DMC-GH2 + LGV 14-140mm lens RW2 "checkerboard" test pattern:

DMC-GH2 + LGV 14-40mm Synthetic RW2 Test Pattern

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Here is what Lightroom 3.6 (with Exposure -2.0 EV, maximum Contrast, no additional gamma correction) does to the RW2 test image when maximum manual barrel Distortion correction is applied. Download the Original image and display in an image-viewer at 20% magnification (which will collapse 5x5 pixel arrays into single display pixels). Note the single central pattern (visible at 20%).

Lightroom 3.6 - Maximum Barrel Distortion Correction - View Original at 20%

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Here is what DxO Optics Pro 7.23 (with Exposure Compensation -2.0 EV, maximum global Contrast, no additional gamma correction) does to the RW2 test image when maximum manual barrel Distortion correction. Download the Original image and display in an image-viewer at 20% magnification (which will collapse 5x5 pixel arrays into single display pixels). Note the 4 peripheral patterns (visible at 20%).

DxO Optics Pro 7.23 - Maximum Barrel Distortion Correction - View Original at 20%

Something rather different in nature is going on when DxO performs barrel distortion corrections ???

Sure. DxO crops the image to a rectangular shape. If you ask LR kindly, I think it will do the same. Or if you ask DxO kindly, it might abstain from the cropping, which from a diagnostic point of view might be even better. If additionally, you make sure that the amount of correction applied by the two converters is exactly the same, it might be an interesting comparison.

 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 +21 more
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