It’s a relatively rare lens (now) from the late 1970s to early 1980s. Kino Precision likely made the lens under the Kiron brand for Vivitar (started as Ponder & Best in the US). The serial number, SN 22810099, indicates the manufacturer (first two numbers), the year made (8=1978), the week (10=March 6-12), and the consecutive number for that week (099).


It’s a heavy lens—288 grams (10.2 oz.) for its size—with lots of glass and brass. I couldn’t find the lens details, so I don’t know how many elements and groups it has. My guess is it has coated optics, as the later lenses have ‘MC’ on the front filter ring. It accepts 55mm filters.
My copy is infested with fungus and shows some haze deep inside. Here are some samples. It’s a shame, really, as the lens has the potential to be a good one. The fast f/2 aperture was not standard or common in a 28mm lens.




Is it horrible? No, not really. Under the right conditions, it could make for some interesting mood shots. Can it be corrected? Yes, the internal elements and groups would need a deep cleaning.
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