Originally Posted by
Oren Grad
Rodenstock's literature says:
The resolving power and the contrast must be at their optimum even at high apertures (f-stop 8 to 11, when used with the relatively small area sensors even from f/5.6) to ensure that diffraction and color noise do not impair sharpness. Furthermore, the correction of curvature of field has to meet the highest demands because of the virtually perfectly planar sensor surface, and the lenses may not generate any color fringes or any visible distortion.
For the regular digital series specifically (Apo-Sironar-Digital, now called Digaron if I remember correctly):
Resolving power is designed for pixel grid widths down to 9 um.
For the HR series specifically:
The Apo-Sironar-Digital HR lenses provide extremely high resolution already from open aperture... perfectly corrected image curvature and a correction for the thickness of the sensor's protective glass. They are the best lenses for smaller sensors with pixel grid widths below 12 um down to 5 um.
Schneider has comparable language in its literature.
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