The Soligor 70-160mm f/3.5 was a constant-aperture portrait-range zoom in Allied Impex's Soligor line, sold during the late 1970s as a faster alternative to the slower push-pull zooms dominating the brand's catalogue.
It uses a manual push-pull zoom-and-focus collar in common Soligor fashion, and was distributed in a variety of interchangeable camera-mount fittings so a single optical design could serve owners of different manual-focus SLR systems. The constant f/3.5 aperture holds through the zoom range, an advantage over the variable-aperture zooms typical of budget third-party lenses of the time.
The 70-160mm range covers head-and-shoulders portraits through to tighter headshots without a lens change, and the faster aperture gives more depth-of-field control and a brighter viewfinder than Soligor's slower superzooms. Sharpness is respectable at mid-range, softening somewhat toward 160mm wide open.
These are scarcer secondhand than Soligor's 90-230mm zoom, so pricing varies with condition. Test the zoom action for smoothness, confirm the aperture stays consistent through the focal range, and check the mount fitting matches the camera.