On Fri, Apr 17, 2009 at 10:07:54AM +0100, mike wilson scripsit: > ---- Graydon <[email protected]> wrote: > > Taking pictures of purple or dark blue flowers with the DA 55-300 vs > > the FA 100 macro, or the DA 35 Ltd vs the FA 31 Ltd makes it really > > really obvious (at least to me) that the DA coatings have a > > different colour curve, one that's missing a dip or a squiggle at > > the high blue end, compared to the FA coatings. > > Chances would seem to me to be high that the makeup of the glass (and > plastic?) of the elements in that pair of lenses would also be > different.
Could well be. On the other hand, while I believe the 35 Ltd. might have some exotic glass in it, I'd be very surprised if the 55-300 does. So better quality control in the glass lens elements, sure; actually different stuff in the glass, chemically? Doesn't seem as likely as having got the coatings to cope better with violet light. -- Graydon -- 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.
