Vivitar Series 1 28-90 F2.8-3.5

[J. C. O'Connell]

I recently acquired the subject lens in
K mount. Havent had a chance to test it
yet ( been buying way too much lenses lately! ).

It's also a varifocal like the 35-80. Anybody
have any experience with it or heard anything
about it?
JCO