I never stated that color correction cant be handled differently with new lenses, of course it can, the point I was trying to make is that visible color has been completely corrected in the past without the need for "new and improved DA coatings". Visible Color correction has been acheived without them already.
JC O'Connell [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of DagT Sent: Thursday, April 16, 2009 4:25 PM To: Pentax-Discuss Mail List Subject: Re: DA55* 55/1.4 follow-up I can´t see why colour couldn´t be handled differently with newer lenses. Remember that these coatings consist of several layers which have thickness depending on which wavelength they should reduce the reflection. This requires fine tuning which has been developed and has become easier since the 60s. The combination of layer thicknesses may have been changed, and thus the colour of the transmitted light may have been corrected as well. DagT Den 16. april. 2009 kl. 20.53 skrev JC OConnell: > But your implying that DA coatings are better because the color > correction is better, I dont agree with that statement as necessarily > being true. Just because you have a DA lens with whatever coating you > feel has better > color correction than another lens you have, doesnt mean that the DA > coatings are responsible or that DA coatings have improved color > correction > or that color corrected lenses have not been availble before these DA > coatings. Color correction has been something that has been attacked > and > addressed since color film was invented, only "improved coating on DA > lenses" > is not fixing what would be a major problem which is what visibly poor > color > correction would be... > > JC O'Connell > [email protected] > > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of > Graydon > Sent: Thursday, April 16, 2009 2:05 PM > To: Pentax-Discuss Mail List > Subject: Re: DA55* 55/1.4 follow-up > > > On Thu, Apr 16, 2009 at 01:41:35PM -0400, JC OConnell scripsit: >> 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? > > I don't believe I said anything about 'colour corrected lenses'; I > said > that the DA coatings were better than the FA coatings, and that this > ought to be considered as a factor when comparing the 55/1.4 to the > diversity of other 50mm lenses available. > > Now, 'better' is obviously subjective, but the BIV end of the spectrum > comes through more richly in the DA lenses I have generally than in > the > FA lenses I have. > > -- 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. -- 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.
