Hoya's vintage telephoto zoom for Nikon — the 80-200mm f/4 with constant aperture.
The Hoya 80-200mm f/4 is a vintage telephoto zoom from Hoya, a company primarily known today for optical filters but which also produced camera lenses during the 1970s–1980s. This version is coupled with Nikon's Ai (Automatic Maximum Aperture Indexing) system for metered operation on Nikon bodies.
The lens covers 80–200mm with a constant f/4 maximum aperture, Nikon Ai coupling for compatible metering on Ai-capable bodies through to modern digital Nikons that support non-CPU lenses, manual focus operation, and a manual aperture ring. The constant f/4 aperture is faster than many consumer telephoto zooms of the period.
The constant f/4 across 80–200mm was a meaningful specification advantage — it provides consistent exposure across the zoom range and a stop of light over f/5.6 alternatives. On modern Nikon digital bodies with non-CPU lens support, the Ai coupling allows correct aperture-priority and manual metering. It is usable as an affordable vintage telephoto on Nikon DSLRs.
Check the Ai coupling ridge on the aperture ring for damage — its integrity is required for correct metering. Inspect aperture blades for oil, which is common in lenses of this age. Test focus ring operation for smooth travel to infinity. Examine internal elements for haze or fungal spotting.