On 5 Feb 2006 at 22:58, John Forbes wrote: > A *ist D sensor can theoretically resolve 1004 horizontal lines (that's > 2008 pixels high divided by 2), and since the sensor is 15.7mm high, > that's almost 64 lines per millimeter. > > So, yes, most of the time, for most people, and for most lenses, the > sensor will out-resolve the lens, and going up to more pixels won't help, > unless the sensor dimensions are increased.
Practically though the best you will be able to achieve is about 44.6lpmm >From a post of mine early 2004: ".. the Kell factor in this case appears to be about 0.7 therefore the resolution in lpmm can effectively be calculated as 3008pixels/23.5mm/2pixels*0.7kell factor=44.8lpmm. I used a conventional test chart in conjunction with a very high resolution lens in order to reduce it's effect on the measurement and I calculated an optical resolution of 44.6lpmm and this was before I made any theoretical calculations." http://en.wikipedia.org/wiki/Kell_factor Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
