One of the lenses that I bought back in the 1970s was a Vivitar Series 1 35-85 variable focus lens. It isn't a true zoom, as you must refocus as you change the focal length.
It's a very heavy lens, but fast at f/2.8 through the zoom range.
There is noticeable barrel distortion at the wide end. A nice lens. It can flare, because of that huge front element.
I shot this around 1980. The original is on K25, and I've converted it to black and white.