ORION-1a 20cm F6.3. VERY RARE SUPER WIDE ANGLE LENS. C OVERS 30×30 cm! ANGLE OF VIEW = 92 °. BASED ON OPTICAL SCHEME OF HIGH-END ZEISS TOPOGON. PRETTY FAST FOR SUCH COVERAGE AND ANGLE. Lens elements are nice without damages, fungus or separation. Lens mounted into high-end ALPA shutter. THIS LENS IS ONLY ONE AVAILABLE SUPER WIDE ANGLE ALTERNATIVE. FOR 12×12 INCHES COVERAGE. Buyers with a feedback of less than 10 points should contact me first!