View source for OUFRO

[[File:OUFRO.jpg|250px]]
*'''Production era''' - 1959-1983
*'''Code number''' - OUFRO 16469
*'''Type''' - 	Extension ring used with [[OUBIO]] for all the longer (125mm+) Visoflex lenses and without [[OUBIO]] for 35/50mm. OUFRO can be stacked for greater magnification per Forum discussion [1] below.
*'''Optical thickness''' - 1 cm
*'''Source'''
**[http://www.cameramanuals.org/leica_pdf/leica_accessory_guide.pdf Dennis Laney's Leica Accessory Guide (1st edition) pgs 49-50] courtesy of Mike Butkus

== Comment ==
*'''On-the-street''' - £GB 25 in 2009 - £GB 30 $US 150 in 2013
*'''Forum discussion'''
**[http://www.l-camera-forum.com/leica-forum/customer-forum/180535-visoflex-combinations.html]
**[http://www.l-camera-forum.com/leica-forum/leica-collectors-historica/181223-oufro-16469y-16469-differences.html]
**[http://www.l-camera-forum.com/leica-forum/leica-collectors-historica/254586-telyt-400-560-mm-f-6-a.html]
**[http://www.l-camera-forum.com/leica-forum/leica-m9-forum/291001-warning-m-typ-240-bellows-ii.html Bellows II w/ M240]
**[http://www.l-camera-forum.com/leica-forum/leica-m-lenses/292396-oufro.html] [http://www.l-camera-forum.com/leica-forum/leica-m-lenses/292396-oufro-2.html] [http://www.l-camera-forum.com/leica-forum/leica-m-lenses/292396-oufro-3.html]
**[http://www.l-camera-forum.com/leica-forum/leica-m-type-240/317214-photo-showing-close-up-macro-components.html]