that may very well be true, but it doesnt meant that color corrected lenses must have DA coatings which was your original argument was it not?
Regarding coatings and lenses and color correction, I believe it has been going on all the way back since the 1960's or earlier that the coatings are chosen to complement the optics. Some super taks for example had amber coatings and some had magenta coatings. I see no reason why they stopped this with SMC and probably the ratio of the multiple coating colors used changes from lens to lens to best correct color. JC O'Connell [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Graydon Sent: Thursday, April 16, 2009 1:13 PM To: Pentax-Discuss Mail List Subject: Re: DA55* 55/1.4 follow-up On Thu, Apr 16, 2009 at 11:34:16AM -0400, JC OConnell scripsit: [snip] > you are claiming VISIBLE color differences/improvements > with these DA coatings. That would be a large measurable change with > respect to all other coatings. THAT is what I dont believe/doubt > seriously. Same flower, immediately sequential time, same angle, same K20D body, different purples from FA31 and DA35. That's in both the JPEG 'preview' in the DNG file and with processing. Maybe it's my eyes, or my monitor. But it sure looks like the DA35 renders the BIV end of the spectrum differently than the FA31 does. -- 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. -- 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.
