Out of curiosity I also put pretty much all my lenses
face-down on the little "light tablet" (tray) I have
for viewing slides.
These were the lenses I checked:
mm f S/N Coat Ring
---------------------------------------
50 1.8 136xxx SC Silver nose
50 1.8 887xxx SC Black nose
50 1.8 5.7 Mio MIJ Black nose
50 1.4 145xxx SC Silver nose
28 2.8 333xxx MC Black nose
100 2.8 202xxx MC Black nose
Here is what I found:
There was only one lens that actually was REALLY white
: the 50/1.8 with serial 887xxx. Interesting this was
my very first lens I obtained in 1979. It has always
been with me... no idea why it refuses to change
color.
The 50 MIJ had a slight tilt towards reddish and
warmer, as had the 100/2.8 MC.
The early 1.8/50 S/N 136xxx was darker/warmer than the
S/N 887xxx, but not as red/warm as the 100mm.
The 1.4/50 had a tilt towards greenish-greyish. With A
LOT OF goodwill one could see a little bit of yellow
in it as well. Certainly the taint on the 1.4 was
different in color than on the other lenses.
The 2.8/28mm was also warmer than white, about as the
100mm.
What does that all mean? I have no idea.
IMO we could probably ask all 200 members about their
600+ lenses and results will be all over the place...
This would show to me that Bill Hunter's assessment
that there are multiple factors, internal and
external, that contribute to changing the color of
glass must be quite correct, and yellowing is only one
possible variation among many.
I was quite surprised to see the differences so
clearly when putting them side-by-side. However, I
would not consider the color bias in any individual
lens as problematic. At least I never noticed
pronounced color shifts when looking at printed or
projected pictures of mine.
FWIW,
Thomas
--- Mark Marr-Lyon <markml@xxxxxxx> schrieb: > Mark
Dapoz wrote:
> >Lens Serial Colour Cast
> >- --------- ------- -----------
> >55mm f1.2 100584 severe yellowing
> >50mm f1.4 109257 minor yellowing
> >50mm f1.4 118622 minor yellowing
> >50mm f1.8 108622 no yellowing
> >50mm f1.8 114234 no yellowing
> >50mm f1.8 121253 no yellowing
> >35mm f2.8 103931 slight yellowing
> >35mm f2.8 108255 no yellowing
> >100mm f2.8 102159 slight yellowing
>
> Very interesting! My 35/2.8 with SN in the high
> 109k's doesn't show any yellowing either. I would
> be very curious to know if either the early 35/2.8
> or 100/2.8 are radioactive too!
>
> Mark
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