> > From: Godfrey DiGiorgi <[EMAIL PROTECTED]> > Date: 2006/12/15 Fri AM 04:13:45 GMT > To: Pentax-Discuss Mail List <pdml@pdml.net> > Subject: Re: K10D diffraction limiting > > Well, the diffraction limit for a 14mm lens, without considering > sensor pixel pitch at all, is around f/6.3 or so. I always consider > lens diffraction limits to be when the iris gets down to around 2mm > in size, whatever f/number that works out to be for a given focal > length. Some lenses are more sensitive than others due to placement > of the iris in the light path. > > I haven't seen the formulae that factor in pixel pitch and aliasing. > > Godfrey
So the light rays are bigger in America, too? 8-) > > On Dec 14, 2006, at 6:14 PM, Digital Image Studio wrote: > > > Does anyone want to have a stab at estimating the practical > > diffraction limit for the K10D? My *ist D resolution seemed drop off > > from about f16, so I assume for a Bayer filtered sensor the practical > > limit would be something like twice the airy disc diameter plus a bit > > to account for the AA filter? > > > > The *ist D sensor has 7.8µm square photosites so the aperture to > > produce an airy disc of twice that is f11 plus one stop fudge. Given > > that the K10D sensor has 6.05µm square photosites applying the similar > > factors would yield a drop in resolution after about f13. > > > > I haven't done any serious comparisons as yet but I'll be keen to see > > if the theory fits the practical. > > > > If you think it's all a crock then you are quite entitled to your > > opinion :-) > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > ----------------------------------------- Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
