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
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