Prinzflex — 135mm f/3.5 compact manual-focus telephoto prime, M42 and SLR mount fits
The Prinzflex 135mm f/3.5 is a manual-focus telephoto prime sold under Dixons' Prinzflex house brand during the 1970s and 1980s. As the slower, cheaper sibling to the Prinzflex 135mm f/2.8, it was the entry-level telephoto in the range, aimed at buyers wanting reach without paying for extra speed.
Weight, filter thread and minimum focus figures were not consistently documented across the mount fits Dixons sold this lens in, so exact numbers are omitted rather than guessed. The lens has a manual focus collar, a click-stop manual aperture ring, and a compact all-metal barrel typical of budget Japanese-made primes of the era.
The smaller f/3.5 maximum aperture keeps the barrel lighter and shorter than the f/2.8 version, at the cost of less background blur and a dimmer viewfinder image. Sharpness stopped down is broadly comparable to other budget 135mm primes of the period.
These are common secondhand, usually cheaper than the f/2.8 version, and often bundled with Prinzflex SLR bodies. Check the aperture blades for oil, the focus ring for smooth travel, and the glass for haze or fungus before buying.