OTQNO

• Production era - 1959-19??
• Code number - 16468
• Type - Visoflex ring addapter used with OUAGO and Elmar (II) f= 9 cm 1:4 to extend the close focus range:
  • One x OTQNO = 2 feet
  • Two x OTQNO = a little under 20 inches (image shown)
• Source
  • Dennis Laney's Leica Accessory Guide (1st edition) pgs 49-50 courtesy of Mike Butkus