Starting October 2004. I am extensively using Norman Koren's Imatest software that can be downloaded and bought here: www.imatest.com . This package provides series of different tests applicable to digital cameras, lens, scanners and printers. For testing Nikon mount lens I am currently using Nikon D200 and for Canon mount, EOS 1D is used. 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 is used, with test shot converted into 48-bit linear pic. That way I'm sure no sharpening and no contrast curve shaping is implemented. Besides, using 48-bit linear conversion gives enough dinamic headroom so no white clipping occures under standard exposure. When testing lens and publishing resolution data, I'm using MTF30 (no sharpening) figures, as this proved to be closest to perceived lens sharpness. Imatest's suggested conservative MTF50 data produced to narrow lens-to-lens differences.