According to the Vivitar folklore as posted by CameraQuest, with certain
exceptions, the first two digits of the serial number on a Vivitar lens
identify the manufacturer. I have a Vivitar Series 1 90/2.5 macro and
its serial number begins with 37. 37 means it's of Tokina origin.
CameraQuest's list of Vivitar suppliers does not mention Tamron but his
supplier ID list is supposedly only valid from 1970-1990 and perhaps a
bit beyond. <http://www.cameraquest.com/VivLensManuf.htm> In any case
it's a really, really nice piece of glass whoever made it. I got mine
from a list member years ago (can't recall who now) who sold it at a
very good price since it had a notable spot of fungus on it. I
partially disassembled it and discovered the fungus was only on the
second element and it came right off very easily with a dab of cold
cream. It couldn't have been on there very long because I couldn't see
any evidence of coating damage. Still using it but I don't think I've
ever mounted the 1:1 adapter other than to see that it works.
Chuck Norcutt
Moose wrote:
... I believe the Viv Mike
> mentions below is a rebadged Tammy.
>> ...Wayne
>>
>>> usher99@xxxxxxx wrote:
>>>
>>> ......
>>> It has beautiful bokeh, very sharp and is APO except when getting close
>>> to 1:1 when the pixel peepers would call the Viv s1 90mm better with
>>> little to no CA.? The light loss at full extension is about 2 stops (I
>>> have not made out my chart yet) which the Viv S1 loses just with the
>>> matched TC.? The Kiron is no slouch and I am not selling my Zuiko 135
>>> which is lighter though only goes to 1:2.? Perhaps Moose can personally
>>> compare them with his next N Eng trip.?
> Could be!
>
> Moose
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