Petrus
06-16-2008, 01:29 AM
An iteresting semi-scientific article about the theoretical "best case" limits of lens resolutions at http://www.luminous-landscape.com/tutorials/resolution.shtml
With FF35 sensors the maximum resolution with green light is only 16 Mpix at f11, 7 MPix at f16 and only 4 MPix at f22. So with cameras like EOS-1Ds you should not close the aperture more than to f8 as not to loose true resolution.
With common APS-C format cameras (most amateur dSLRs) the limits come one f-stop earlier, with 12 MPix bodies do not use f-stops smaller than f8.
Even worse with small sensor cameras: with hi-rez four-thirds sensor f5.6 is the smallest usable aperture before resolution loss from diffraction occurs.
It seems that many point-and-shoots have a combination of tiny hi-rez sensor and a slow lens which can not even in theory give 10+ MPix resolutions at any aperture those manufacturers claim.
The table # 3 is at the end of the lengthy article.
With FF35 sensors the maximum resolution with green light is only 16 Mpix at f11, 7 MPix at f16 and only 4 MPix at f22. So with cameras like EOS-1Ds you should not close the aperture more than to f8 as not to loose true resolution.
With common APS-C format cameras (most amateur dSLRs) the limits come one f-stop earlier, with 12 MPix bodies do not use f-stops smaller than f8.
Even worse with small sensor cameras: with hi-rez four-thirds sensor f5.6 is the smallest usable aperture before resolution loss from diffraction occurs.
It seems that many point-and-shoots have a combination of tiny hi-rez sensor and a slow lens which can not even in theory give 10+ MPix resolutions at any aperture those manufacturers claim.
The table # 3 is at the end of the lengthy article.