It's worth noting that we are likely to see even the remaining mechanical diaphragm actuation lever eliminated in the future and all interaction between the camera body taking place through electronic communication. Nikon is already moving in that direction and making lenses with built-in electronically-controlled diaphragms (Canon has had only electronic diaphragm control since the introduction of the EF mount in 1987). Though it's early days, such lenses are not compatible with any Nikon DSLR prior to the D3. Tamron's two new lenses are electronic-only for diaphragm control and incompatible with early Nikon DSLRs. This is likely why Tamron and others offer so few lenses in Pentax mount it's much easier to deal with multiple lens mounts when there's as little mechanical interaction between camera body and lens as possible.
When Pentax does introduce electronic aperture control in the future I expect them to go the Nikon route and make most lenses and bodies backward and forward compatible. -- 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.
