MC Rubinar 500 mm f/ 5.6 is a mirror multicoated lens. It can be used as an interchangeable lens on modern cameras by means of  M42 adapter rings.

• M42x1 / 45.5 – common landing thread ‘M42’.
  
• Lens fit for full-size cameras with a frame size of 36 x 24
• Mirror-lens or cathodioptric type of lens
• MC – multilighting optics
• MACRO – the possibility of pseudo-macro photography
• Only manual focus
• Non-adjustable diaphragmfixed at f / 5.6
• Tripod socket with rotation lock
• Filter kit and metal hood included
• ‘bagels’ in bokeh