Comparing corrected and uncorrected images of CV12mm/5.6 on Sony NEX-7

In a post from yesterday I analyzed a series of images from the Voigtländer Ultra Wide Heliar 12mm/5.6 on my Sony NEX-7 in order to identify the best aperture for maximum resolution. I wondered about the impact of my corrections at the stage of post-processing the images. To answer this question I picked the image taken with an aperture of f=8 and compare a uncorrected and a corrected version of the image.

While post-processing the uncorrected image I did the following:

  • conversion from ARW- to DNG-format
    (Adobe DNG Converter 6.6.0.261)
  • input sharpening in Adobe Camera Raw
    (Sharpn. = 25, Shrp.Radius = +1.0, Shrp.Detail = 25, Shrp.EdgeMasking = 0)
  • noise reduction in Adobe Camera Raw
    (LuminanceSmoothing = 0, Col.NoiseReduction = 25, Col.NoiseRed.Detail = 50)
Magenta cast and vignetting in corners uncorrected, distortion and chromatic aberrations also uncorrected.
Full image (uncorrected) with marked crop locations

While post-processing the corrected image I did the following:

  • conversion from ARW- to DNG-format
    (Adobe DNG Converter 6.6.0.261)
  • correction of magenta cast in the corners and vignetting with cornerfix
    (cornerfix 1.4.2.0)
  • correction of chromatic aberration in Adobe Camera Raw
    (ChromaticAberrationR = -15, ChromaticAberrationB = +8)
  • correction of distortion in Adobe Camera Raw
    (LensManualDistortionAmount = +3, PerspectiveScale = 101)
  • input sharpening in Adobe Camera Raw
    (Sharpn. = 25, Shrp.Radius = +1.0, Shrp.Detail = 25, Shrp.EdgeMasking = 0)
  • noise reduction in Adobe Camera Raw
    (LuminanceSmoothing = 0, Col.NoiseReduction = 25, Col.NoiseRed.Detail = 50)
Corners corrected with cornerfix, distortion and chromatic aberrations corrected with Adobe Camera RAW
Full image (corrected) with marked crop locations

For each of the marked locations in the full image I extracted a square (250 pixel * 250 pixel) which I will present at it’s original resolution. These images are not sharpened except for the same input sharpening with the raw converter. They are saved for web with a quality-setting of 60%.

Voigtländer Ultra Heliar 12mm/5.6@8 (uncorrected)
Voigtländer Ultra Heliar 12mm/5.6@8 (uncorrected)

Voigtländer Ultra Heliar 12mm/5.6@8 (corrected)
Voigtländer Ultra Heliar 12mm/5.6@8 (corrected)

In my opinion it’s clearly visible that the applied correction didn’t reduce the resolution of the image and therefore the identification of the best aperture for maximum resolution is not affected by these corrections.

 

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Author: PanoTwin Jürgen

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