Oops, my memory is failing me. The third generation, variable aperture
Vivitar was made by Komine, not Kino Precision. There are also 4th and
5th generation models made by Cosina. They are universally recognized as
inferior.
The Kiron Zoomlock model was an f/4, made after the f/3.5 1st generation
model contract expired with Vivitar.
These are now 20 year old designs . . .
Gary Reese
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