Albinar's M42 telephoto — the 200mm f/3.5 with auto aperture in screw mount.
The Albinar 200mm f/3.5 Auto in M42 screw mount is a budget telephoto from the Albinar brand. Albinar was a rebranded Japanese lens line — quality varies. The f/3.5 is faster than typical f/4.5 alternatives. The 'Auto' designation indicates automatic diaphragm — more convenient than preset. The M42 mount adapts to any camera.
Albinar quality varies — some were rebranded decent Japanese optics, others were basic. The f/3.5 at 200mm is faster than typical budget alternatives. Sharpness depends on the specific OEM manufacturer. The auto aperture adds convenience over preset alternatives. Build quality is basic but functional.
M42 screw mount. Filter thread varies. Weight varies. Build quality is basic. Auto aperture — stays open for focusing, closes to set aperture when shooting. The M42 universality enables use on any mirrorless camera. The f/3.5 is the faster-than-typical specification.
Very cheap. Check for smooth focus and clean optics. The f/3.5 is faster than typical budget alternatives. Albinar quality varies — some copies are decent. The auto aperture is more convenient than preset. Better known-brand M42 200mm options exist. Adequate for casual telephoto experimentation.