Experiences with the Vivitar Series 1 Q-dos Lens
Experiences with the Vivitar Series 1 Q-dos Lens
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The Vivitar Series 1 Q-dos zoom lens 2.8-4/70-210 is a very special lens. There are no similar lenses except a few custom build samples as far as I know.
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– http://www.pauck.de/marco/photo/photo.html