I think that's exactly right, Stan. Lens designers are quite smart. Godfrey
> On Nov 4, 2013, at 3:57 PM, Stan Halpin <[email protected]> wrote: > > I've always assumed that the design compensation for a rear filter was a > trade-off. Such lenses tend to require huge (expensive) filters. So, rather > than make you bear the cost of expensive add-ons, they assume a (rear) filter > will be in place and compensate for it. And probably design a set of the > "necessary" high-quality filters that fit the drawer and conform to their > design. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.

