NO

Leica Code	Description	Production Year	Remarks
NAKUL	Film viewer with magnifier and indicator punch; with handle; the 250 version has side cups to handle a long strip of film	1936-19??	-
NAMAS	Opal glass to fit behind the film in a film viewer	1930's	-
NATRA	Film viewer with magnifier and indicator punch; without handle	1932-19??	-
NOKUM	Close focus accessory with parallax for Summar f= 5 cm 1:2 lens (formerly NOOKY-HESUM)	1960-19??	16505
NOOBU	Film viewer without indicator punch	1951-19??	-
NOOKY	Close focus accessory with parallax for Elmar (I) f= 5 cm 1:3.5 lens	1935-19??	16500
NOOKY-HESUM	Close focus accessory with parallax for Hektor f= 5 cm 1:2.5 or Summar f= 5 cm 1:2 lens	ca.1935-1959	-
			-
OAGNO	Medical copy stand using PLOOT	1938-19??	-
OAPDO	Medical copy stand using PLOOT	1939-19??	Italian item
OCEGO	Leica Ig body	1957-1963	-
OCLOM	49	19??-19??	-
ODULO	46	19??-19??	-
OEFGO	Leica If	1952-1957	-
OEGIO	Leica Ic	1949-1952	-
OEUPO	Extension ring for Summicron 9 cm with !:4.5 reproduction ratio	1959-19??	16474
OHIKO	Stereo unit complete with Stemar lens OISBO, prism, and viewfinder for screw-mount cameras	1954-1957	-
OHIKO-M	Stereo unit complete with Stemar lens OISBO, prism, and viewfinder for M-mount cameras	1950's	-
OHTEO	OIPVO stereo viewer + OIFCO light unit	1950's	-
OHUGO	101	19??-19??	-
OHVIO	101	19??-19??	-
OHWLO	101	19??-19??	-
OIASO	37	19??-19??	-
OIDYO	Cylidrical chrome, half frame viewfinder used with Stemar stereo unit	1950's	-
OIFCO	Stereo light unit	1950's	-
OIGEO	Stereo lens hood for use on Stemar when prism is not attached	1950's	-
OIMPO	Prism for front of Stemar for subject distances beyond 10 feet; hinged front cover added in 1955	1950's	-
OIPVO	Stereo viewer with independently focusing eye pieces; brittle plastic housing	1950's	-
OIRZO-M	Stereo unit complete with Stemar lens OIGEO, prism, and viewfinder for M-mount cameras	1950's	-
OIRZO-S	Stereo unit complete with Stemar lens OIGEO, prism, and viewfinder for screw-mount cameras
OISBO	Stemar stereo lens	1950's	-
OIVHO	Rear cover for bayonet-mount Stemar	1950's	-
OIWKO	Lens cap with bayonet for Stemar	1950's	-
OIXMO	Rear cover for screw-mount Stemar	1950's	-
OIZQO	Rear cover for Stemar prism	1950's	-
OKARO	Orange filter to improve contrast between rangefinder images for FOKUS or Leica IIc, IIf, IIIb, IIIc and IIIf in chrome	1939-1962	14058
OKBZO	Diopter correction lens for near-sightedness for Leica IIIg	1960-19??	14064
OKLMO	Connecting piece to convert Focomat Ic enlarger to copy use with column VOOQF and arm OKYNO	1956-19??	16744
OKVCO	Diopter correction lens for astigmatism for Leica IIIg	1960-19??	14066
OKYNO	Arm for Focoslide Valloy II enlarger	1956-19??	16748
OKZPO	67	19??-19??	-
OLEYO	20-1	19??-19??	-
OLIGO	20	19??-19??	-
OLLUX	Hood for 35mm f/1.4 Summilux I	1961-?	-
OLORA	20	19??-19??	-
OMAPO	Close focus accessory with parallax for 50 mm 1:4 lens; per Lager: catalog item only, no known examples are known	1939	-
OMEXO	Complete copy stand including OOZEG, OOZAB, ZOOXY, VALOO, LVFOO, KGOON, OPKOM, ROOYH and ONLIO	1951-19??	-
OMIFO	Close focus accessory with parallax for Elmar (III) 1:4 / 90mm lens	1949-19??	-
ONLIO	Canvas carrying bag portion of OMEXO for Focoslide	1951-19??	-
OOBAZ	Late version focusing stage known as Focoslide for Screw-thread cameras using N series helical focusing lenses and extension tubes	1958-19??	16607
OOEUK	72-3	19??-19??	-
OOEVM	72-3	19??-19??	-
OOFRC	87	19??-19??	-
OOGAN	60	19??-19??	-
OOGIT	?	19??-19??	-
OOGUM	?	19??-19??	-
OOMAP	?	19??-19??	-
OOMEX	?	19??-19??	-
OOMYL	?	19??-19??	-
OORES	54-56-68-74	19??-19??	-
OOTGU	Late version focusing stage known as Focoslide for M-cameras using N series helical focusing lenses and extension tubes	1957-19??	16680
OOZAB	Focusing stage known as Focoslide; early version had single bar on spring-loaded arm; later version with adjustable positioning bar; last version was H-shaped to clear flash bracket lug	1938-1957	-
OOZAB-G	Focusing stage known as Focoslide for accepting Leica IIIg camera	1951-1957	-
OOZEG	Folding horse-shoe type copy stand portion of OMEXO for Focoslide	1951-19??	-
OOZIS	75	19??-19??	-
OOZKU	75	19??-19??	-
OOZMY	59	19??-19??	-
OPDUR	Medical copy stand using OPRAL and OPFAS	19??-19??	-
OPFAS	Medical copy stand using frame with handle and chest support	1932-19??	-
OPKOM	Cable release portion of OMEXO for Focoslide; 20 inches with lock	1951-19??	-
OPRTO	Diopter correction lens for near-sightedness for Leica IIc, IIf, IIIb, IIIc and IIIf	1951-19??	14060
OPRYL	Medical copy stand using lower body strut with webbing sling	19??-19??	-
OPSVO	Diopter correction lens for astigmatism for Leica IIc, IIf, IIIb, IIIc and IIIf	1951-19??	14065
OQZIO	Diopter correction lens for near-sightedness for Viso magnifiers LVFOO and PEGOO	1960-19??	14063
ORAKO	Orange filter to improve contrast between rangefinder images for FOKUS or Leica II, III and IIIa in black or chrome	1936-1962	14057
ORBMO	19	19??-19??	-
ORLEO	Diopter correction lens for astigmatism for Leica M-cameras to 1977	1956-1977	14062
ORESO	65	19??-19??	-
ORMGO	Diopter correction lens for astigmatism for Leica I-IIIa and Universal viewfinder	1941-19??	NY item
OROLF	110	19??-19??	-
ORQPO	108-9	19??-19??	-
ORTOX	Diopter correction lens for near-sightedness for Leica M-cameras to 1977	1951-1977	-
ORTUX	Diopter correction lens for near-sightedness for Leica I-IIIa and Universal viewfinder	1951-19??	14061
ORTVO	110	19??-19??	-
ORUXO	Diopter correction lens for astigmatism for Leica I-IIIa and Universal viewfinder	1938-19??	14069
ORWYB	Diopter correction lens for near-sightedness for Leica IIIb	1939-19??	NY item
ORYCE	Diopter correction lens for astigmatism for Leica IIIb	1939-19??	NY item
ORYFO	110	19??-19??	-
OSBLO	110	19??-19??	-
OSERO	Diopter correction lens for astigmatism for Viso magnifiers LVFOO and PEGOO	1960-19??	14069
OTDYM	49	19??-19??	-
OTEMO	Stemar attachment for subject distance of 3 - 10 meters; only 20 of these were delivered	1950's	-
OTPRO	1:1.25 magnification accessory for OTZFO focusing mount used with Visoflez II/ III	?	16471
OTQNO	49-0	19??-19??	-
OTRPO	49-0	19??-19??	-
OTSRO	Adapter for use of 13.5 cm Hector lens with OTZFO focusing mount used with Visoflez II/ III	?	-
OTVXO	49	19??-19??	-
OTXBO	49	19??-19??	-
OTYDO	49	19??-19??	-
OTZFO	Focusing mount for Visoflex II/ III for use with 65mm Elmar, 90mm Elmarit and 135mm Elmar lenses	?	16464
OUAGO	49-0	19??-19??	-
OUBIO	Visoflex II/ III adapter for TELYT lenses	?	16466
OUCLOO	49	19??-19??	-
OUEPO	Close-focus adaptor to be used with either the 2/90 in ZOOEP/16463 or 16462 adaptor or the 2.8/135 in 16462 adaptor. This usage will yield a 1:4.5 reproduction scale.	?	16474
OUFRO	Extension ring for 35/50mm M-bayonet lenses with 1:1 ratio	?	16469
OUFRO	49-0	19??-19??	-
OUTSO	63-78	19??-19??	-
OVAFO	Base and 48 x 1 5/8" diameter column for Reprovit I	1951-19??	-
OVURO	Valoy II copy stand with 32 inch column and UWOOS bracket for Focoslide	1960-19??	16701
OZTNO	88	19??-19??	-
OZTOM	47	19??-19??	-
OZUPO	47	19??-19??	-
OZWTO	47-88	19??-19??	-
OZWTO-M	88	19??-19??	-
OZXOM	47	19??-19??	-
OZXVO	88	19??-19??	-
OZYXO	47	19??-19??	-