The serial number of this Vivitar Macro Focusing 28-135mm f/3.5-4.5 is 09516041, so it is made by Cosina.* It takes 67 mm filters, weighs 669 g, has 14-elements in 11-groups and can focus as close as 0.20 m ( 0.7 feet). This one has an Olympus lens mount.
The lens does get to change length, but it has more to do with the focus than the zoom position.
It does its greatest change in length when fully extended into Macro mode.
It is a gorgeous chunk of glass and steel. Of course it has Multi-Coating!
It came with a skylight filter.
*The actual manufacturer of a Vivitar lens can be identified by the first digits of the serial number:
09 - Cosina
13 - Schneider-Kreuznach
19 - Sigma
22 - Kino Precision Industries
25 - Ozone Optical
28 - Komine
32 - Makina Optical
33 - Asanuma
37 - Tokina
42 - Eugen Bauer,
44 - Perkin Elmer
47 - Chinon
51 - Tokyo Trading
56 - Kyoe Shoji
61 - Samyang
6x - Olympus
75 - Hoya
77 - Kobori
81 - Polar,
9x - Cosina.
This numbering system, however, was used by Vivitar only between 1969 and 1991 (approx.)
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