I found some specs on it...
"90mm f/2.5 Macro Series 1 M: Macro reproduction is 1:2, but it was suppled
with a closeup lens which brought it to 1:1. Lens construction uis 8 elements
in 7 groups, with the adapter closeup lens having a construction of 3 elements
in 3 groups. Filter size is 58mm and weight with adapter is 936 grams, about 32
ounces."
Reference:
http://cyberdenis.topcities.com/vivitar.htm
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