The biggest difference in coatings is that the rear surface of the rear lens element is coated to minimize internal reflections between the rear element and the sensor.
Film lenses didn't have (or need) this coating, since the film emulsion is not smoothly reflective like the glass filter covering the sensor is. On Wed, Sep 8, 2010 at 9:11 PM, Christine Nielsen <ch...@inielsen.net> wrote: >> On Wed, Sep 8, 2010 at 4:40 PM, P. J. Alling <webstertwenty...@gmail.com> >> wrote: >>> >>> The D means it's "optimized" for digital. >>> >>> 1. It has special coatings and a revised /special/ optical design to >>> minimize the faults that digital is err to. (I think this is mostly >>> marketing hype, a good lens is a good lens and makes good photos, a bad lens >>> can still be fun). >> > > > Interesting. I've often wondered if the special coatings were "all > that"... Thanks for your input. > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- David Parsons Photography http://www.davidparsonsphoto.com Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
