AFAIK all Pentax glasses get the same coating except maybe DA* lenses. No reason theDA55-300 do not gets it.
On Fri, Apr 17, 2009 at 4:03 PM, Graydon <o...@uniserve.com> wrote: > On Fri, Apr 17, 2009 at 10:07:54AM +0100, mike wilson scripsit: >> ---- Graydon <o...@uniserve.com> 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 > 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. > -- Thibault Massart aka Thibouille ---------------------- Photo: K10D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ... Thinkpad: X23+UB,X60+UB Programing: D7 user (trying out D2007) -- 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.
