A standard lens with a classical and compact style, bearing the name of "APO-LANTHAR," a proof of ultimate performance. While adopting a maximum aperture of F3.5, the lens is composed of eight elements in six groups, four of which are made of anomalous partial-dispersion glass, to achieve uncompromising optical performance. There is practically no distortion or flare.  The optical design is adapter friendly allowing use on many camera platforms. Ten aperture blades for great bokeh and ten point sunstars from f4 to f16. Although styled much like the super rare collapsible 50mm F3.5 Micro-Nikkor in LTM mount,  it is not collapsible.