Soligor — manual-focus 135mm f/3.5 telephoto prime sold across most 1970s SLR mounts
Soligor was a brand used by Allied Impex Corporation to market Japanese-made optics through camera shops and mail-order catalogues from the 1950s into the early 1980s. The 135mm f/3.5 was a widely stocked short telephoto, a budget alternative to first-party primes of that era.
It is a manual-focus prime catalogued in numerous camera-mount fittings rather than a single fixed mount, following Soligor's practice of selling the same optical cell to suit whichever fitting a buyer's SLR required. Earlier screw-mount and Exakta-fit copies used a preset aperture ring; later bayonet versions added an automatic diaphragm coupled to the body.
Rendering from this older design is softer wide open than contemporary Nikkor or Takumar equivalents, with contrast and edge sharpness improving once stopped down to around f/5.6-f/8. Single-layer coating on early examples gives flatter colour and more flare in backlit scenes.
These lenses turn up cheaply and in numbers on the used market, typically via mount-specific listings rather than specialist dealers. Check that the aperture blades move cleanly without oil staining, that the mount exactly matches the camera, and inspect for haze or fungus.