More recent lenses, at a guess I would say those manufactured in the
80's, already hava date code on them in the form of a group of white
letters near the rear element. These letters denote the particular
factory which made the lens and the year and month.
Giles
frieder.faig@xxxxxxxxxxxx-stu wrote:
> I've been thinking about to collect the serial Numbers from all photos, where
> the
> age is known. A table with this information might help to guess the age of a
> lens.
> What is your opinion about?
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