Soligor — 350mm f/5.6 manual telephoto prime, multi-mount fit for 1970s SLR systems
The Soligor 350mm f/5.6 was a longer manual-focus telephoto in Allied Impex's Soligor catalogue, sold during the 1970s as a step up in reach from the more common 300mm class lenses the brand also offered, and made for Soligor by contracted Japanese manufacturers.
It is built as a manual-focus prime with a narrow barrel typical of modest-aperture long telephotos of the period, offered across several interchangeable camera-mount fittings so the same optical unit could serve a variety of SLR systems. Diaphragm operation on lenses of this class was commonly preset rather than fully automatic, needing the ring set and closed down before the shot.
Reach at 350mm exceeds a 300mm, though the modest f/5.6 aperture combined with older coatings limits it in dim light and lowers contrast in hazy or backlit conditions. Handheld use benefits from a fast shutter speed or a monopod given the narrow field and length of the lens.
These are seen less often secondhand than Soligor's 300mm, so listings should be checked carefully for the correct mount and for haze inside the long optical path. Sellers rarely test focus accuracy, so confirm infinity focus and smooth helicoid travel before buying.