John Austin wrote:
>...
>I'm curious about one thing. Does your example of the 180mm indicate on
>the front ring that it is MC? I'm just wondering if what you are seeing is
>not uncorrected abberations but flare. Just a thought.
>...
The lens which I have has the following written on the front ring:
OLYMPUS OM-SYSTEM ZUIKO AUTO-T 180mm 1:2,8 203xxx Lens made in Japan
where I have replaced the last three numbers of the serial number with
'xxx'. At the rear of the lens, at the black ring which is closest towards
the mirror of the camera it is written 'TNHA', which I assume is some kind
of manufacturing date code.
It´s hard to see exactly what colours are reflected from the front element
but it seems that red/purple is the dominating colour. From the zuiko lens
site (http://www.datasync.com/~farrar/zuiko.html) I have the information
that all Zuiko 180/f2.8 lenses are multi-coated (MC).
>From the OM System Lens Handbook (printed in 1984) I have also the
information that this lens should be MC. The lens which is photographed in
connection with the data for this particular lens in the book has the serial
number 100159. I guess that if showing that particular lens side by side
with the data which states that these models of lenses are MC, I assume that
this particular lens which is illustrated is also MC. All this together
makes me think that my example of this lens is indeed MC.
I have seen flare in some of my other Zuiko lenses under some circumstansies
but then the colours of the flare have had some connection with the colour
of the light that has caused the flare. For example an evening sun into the
lens has given yellowish-reddish flare. Rarely I have also seen that one or
another of my photos seems to have an appearance as if someone had scattered
potato-meal over them, the whole photo had like a white dust on it.
This I assume is flare of some kind. Non of these photos have had any other
colours of the parts which I assume is flare other than hues of the light
which had caused the flare, mostly white with some yellow-orange tones
occasionally. Never blue. In fact when looking at the photos in questions
taken with the 180/f2.8 I would say that the blue is not pure blue but also
somewhat purple, however, the blue hue is dominating.
But perhaps this small purple addition is due to the setting of the
colour-correction of the machine which the lab used. I have only used
negative films with this lens, no slides. So all in all I still think that
these blue shadows which I sometimes get with this lens is not from flare
but from something else.
Boris von Stahl
Stockholm, Sweden
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