This is not a problem unique to Pentax digitals. Some of Nikon's more exotic lenses (14/2.8, 20-35/2.8) supposedly perform much worse on their high-res digital cameras than on film or the original 2.77MP D1. The in-camera interpolation of the sensor, which other than the Foveon only reads one color at any pixel and has to figure out from adjacent pixels what the other two should be, is probably the cause of the trouble. Also, the resolution of digital sensors is approaching the resolution of 35mm lenses, so faults may be more apparent than on your average film.
A modern lens is a tricky thing to build, especially a complex and highly specialized design like a macro or an ultrawide. Since most of the designs are older than digital, they are presumably optimized for performance on film. Digital sensors may require slight differences in lens design for best performance (although the better solution is to get the sensors to handle designed-for-film lenses right). I think that Kodak might be right in having in-camera "optimization" for specific lenses. DJE > I guess you are magnifying the aberration more due to the crop factor > (or focal multiplier or whatever you want to call it). Also, due to it > being a bayer sensor a 1 pixel wide aberration would be interpolated to > affect all the surrounding pixels in terms of colour. > > I am still surprised it makes as much difference as you observed though! > Presumably there is NO sign at all of this on film? > > > -----Original Message----- > > From: Jostein [mailto:[EMAIL PROTECTED] > > Sent: 15 October 2003 12:32 > > To: [EMAIL PROTECTED] > > Subject: Re: I got my *ist D and I LOVE IT !!! > > > > > > Quoting [EMAIL PROTECTED]: > > > > > > > > However, one question, why would the chromatic aberration > > be worse or > > > show up worse on a digital rather than a film camera?
