On Thu, Apr 16, 2009 at 10:55:13AM -0400, JC OConnell scripsit: > Are you trying to imply that Pentax and other major brand > multicoated lenses have not been "wideband" color > neutral across the entire VISIBLE spectrum until > these DA coatings came along? That seems unlikely to me.
[what is with the hundreds of blank lines at the end of your posts?] I'm not implying that; I'm stating that. NO coating, even the very best current coatings, is completely flat in its colour transmission characteristics; there tends to be a shallow dip toward the red and blue ends of the spectrum. Prior to current-generation (or possibly current generation minus one by now) coatings, there tended to be a fairly sharp dip in the violet, too. Any coating is going to involve a pile of tradeoffs in how it does colour transmission; more red means less something else, and so on. -- 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.
