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Miljenko Devcic | profile | all galleries >> tech >> Lens reviews and tests >> How I'm doing resolution measurements >> NEW !!! Lens tests using IMATEST tree view | thumbnails | slideshow

NEW !!! Lens tests using IMATEST

Starting October 2004. I am extensively using Norman Koren's Imatest software that can be downloaded and bought here: . This package provides series of different tests applicable to digital cameras, lens, scanners and printers. For testing Nikon mount lens I used Nikon D200, D300, D7000 and currently D7100. Camera is set as follows: RAW, auto WB, contrast normal, no sharpening, standard saturation, Color space I (sRGB). Q13 stepchart test showed uncorrected gamma of 1.0 and dinamic range of 6 f-stops. To avoid different curves implemented into different RAW converters, built-in Imatest's DCraw converter was used at first, with cutoff point set at MTF 30. In the meantime, Norman Koren's suggestion of using MTF 50 as the proper cutoff point was widely accepted so I changed the procedure accordingly. However, sharpening ammount involved was inadequate IMHO, so I've chosen completely different way of reading raws. For some time now I'm using Adobe PS with the latest ACR plugin. The only deviation from default ACR settings is sharpening set to 50% instead of default 25% figure. The advatage of the concept is to get just the right sharpening ammount to reach max resolution with the sharpest lenses available. When used with real life shots, this ACR setting gives sharp pics with no trace of oversharpening and no excessive noise increase.
Imatest FotoMag test target
Imatest FotoMag test target
Best Imatest results
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