Prinzflex's M42 wide-angle — the budget 35mm f/2.8 for screw-mount cameras.
The Prinzflex 35mm f/2.8 Auto Reflex M42 is a budget wide-angle for M42 screw mount from the Prinzflex brand — a rebranded budget lens. Prinzflex was a brand name used by various retailers for affordable Japanese lenses. The M42 mount provides universal camera compatibility. Basic quality at minimum cost. Manual focus with auto diaphragm.
Basic rebranded quality. Sharpness acceptable stopped down. The 35mm f/2.8 is a standard wide-angle specification. The M42 mount is the practical advantage — universal compatibility. Build quality basic. Prinzflex lenses are not premium — functional at the budget level. Better M42 wide-angle options exist from Pentax Takumar and other known brands.
M42 screw mount — universal. Filter thread varies. Weight varies. Build quality basic. The M42 universality enables use on any mirrorless camera. Not a premium brand — Prinzflex is rebranded budget Japanese. Better known-brand M42 alternatives available at similar near-zero pricing.
Very cheap. M42 universal. Basic Prinzflex quality. Better M42 wide-angles from Takumar and others at similar cost. Not recommended when better options cost the same. The M42 mount is the sole practical advantage. Only if received free or no alternatives available.