Rob, please pardon the interruption. When a film manufacture professes a given number of lines a particular film is capable of resolving, how is this determined? Optically or theoretically? i.e.- 80 or 160 l/mm depending upon contrast.
Jack --- Rob Studdert <[EMAIL PROTECTED]> wrote: > 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 > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
