On 28 Jun 2004 at 9:22, Rob Studdert wrote:
Sorry I'll try that paragraph again: Most all wide angle lenses exhibit some CA, the problems exhibited when using them with digicams is a little more complex as sensors have two primary characteristics that are very different from film. Firstly for all intents you can consider film to have no depth, light that strikes its surface at an acute angle will be recorded pretty accurately. Digital sensors on the other hand have micro-lenses which are positioned above the actual light sensitive substrate hence each pixel has significant depth between the sensor surface and the actual light sensitive receptors. This means that acute light angles are going to cause all sorts of related problems such as vignetting and spill to adjacent sensor sites. I hope this makes sense. 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
