Arnold wrote:
...
Whether the coatings of the different versions differ
much I am not sure, but the coating of my "SMC Pentax
1:1.2 50mm" surely looks different from the coatings
of the "SMC Pentax 1:1.8/85" and of the  "SMC Pentax
1:3.5/135".
Arnold
------------------------------

I think also lenses of the same generations may have
individual coatings. I have an old style "SMC Pentax
1:2.8 30" (serial number starts with 53) that has
blue-ish turquoise looking coatings. It is very
different from the coatings of the (old style K-)"SMC
Pentax 1:1.4/50" (which I sold). 

BTW the A lenses (and FA lenses) have a different (and
in my view superior) color rendition compared to K and
M lenses, particularly the blue tones. This is
probably due to changes in their coatings. I made some
side by side shots with the (new style) K-"SMC Pentax
1:3.5 18mm" (serial number starts with 55) and the
FA24mm/2 lens; the differences (in slides) are quite
obvious, particularly regading blue tones (though the
18mm has a non-removable 1A filter, but both lenses
tend to warmer color tones ... ). 
IMO the blue tones tend to be "grey-ish" on slides
taken with K- (and M-)lenses (an exception is the 30mm
lens). I decided for the A-version of the 1.2/50mm
because of this.
Enjoy,
Alexander 
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