On 8 Mar 2004 at 23:54, Greg Lovern wrote: > Does > it follow that a 35mm film lens' resolution, when used on the *ist D, will > be 43% of its resolution on a 35mm film camera? (And conversely, that its > resolution on a 35mm film camera would be 234% of its resolution on the > *ist D?)
Lens resolution remains the same, system resolution however is a function of the lens resolution and the sensor resolution. Practically the system resolution of the *ist D using the best optics is about 45lpmm. > If a given DA lens were to be as similar as reasonably possible to a given > 35mm lens, with the sole exception that it's image projected the same > resolution onto the smaller area of the *ist D's sensor, would the sensor > be able to capture 234% as much resolution as it would with the 35mm film > lens? No, see above. > If a very sharp lens, such as Pentax's sharpest 50mm lenses (past or > present), loses 57% of its resolution when used on the *ist D, is it still > a very sharp lens? Still sharp but more detail could easily be resolved on most any film. > I plan to get an *ist D soon no matter what answers I get to these > questions. I'm just wondering what the potential is for DA lenses, all > else being equal, to be sharper on the *ist D than 35mm film lenses. One would hope that they should be optimised to limit chromatic aberrations at wide angles of view, most other parameters are well served by existing K-mount lenses. Cheers, 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
