The Vivitar 80-200mm f/4-4.5 sat above the brand's cheapest variable-aperture telephoto zooms, offered as a brighter mid-range option for manual-focus SLR owners wanting more speed than the budget f/4.5-5.6 version without stepping up to a Series 1 lens.
It is a manual-focus telephoto zoom with a maximum aperture running from f/4 at 80mm to f/4.5 at 200mm, produced in the principal manual-focus SLR fittings sold through independent camera dealers of its era. Weight, filter thread, element count and minimum focus distance are not confirmed from available sources.
The narrower aperture range than Vivitar's budget 80-200mm f/4.5-5.6 gives a brighter finder image and slightly more working depth-of-field control, though it remains a conventional rather than a Series 1-grade optical formula.
It sells cheaply on the used market, generally as a practical rather than collectible lens. Checks worth making: smooth zoom and focus rings, clean aperture blade action, and inspection for the haze and fungus common in decades-old multi-group zooms.