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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code Description Production Year Remarks
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 Visoflex II with 4x 90 magnifier, bayonet mount 1962-19?? -
OCMOR Visoflex lens 1:3.5 / 65 Elmar 1960-1970 11062
ODULO PROON reflex housing + PAMOO right-angle magnifier 1940-19?? see Ploot
OEFGO Leica If body 1952-1957 -
OEGIO Leica If with viewfinder for 50 mm lenses; Leica Ic in 1950 NY catalog 1952-1957 -
OEINO Leica If with viewfinder for 50 mm lenses and ELMAR 1952-1957 -
OERDO Summicron 90 short mount with preset diaphragm Forum discussion 19??-19?? 11126
OESBO Summicron 90 short mount with standard diaphragm ring Forum discussion 19??-19?? 11124
OEUPO Extension ring for Summicron (II) f= 9 cm 1:2 with !:4.5 reproduction ratio 1959-19?? 16474
OHEBO Hektor f= 13.5 cm 1:4.5 in short focusing mount with iris diaphragm but without coupling (ZOOKE) 1955-1958 -
OHEBO-M as above with front mount diameter 42 mm 1955-1958 -
OHIKO Stereo unit Stereoly 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 1954-1957 -
OHTEO OIPVO stereo viewer + OIFCO light unit 1950's -
OHUGO No. 1 light yellow filter; paired for Stemar mount ca.1959 NY item
OHVIO Orange filter; paired for Stemar mount ca.1959 NY item
OHWLO UVa filter; paired for Stemar mount ca.1959 NY item
OIASO Stemar stereo lens for M-camera 1954-1957 -
OIDYO Cylidrical chrome, half frame viewfinder used with Stemar stereo unit similar in shape to SBOOI 1954-1957 -
OIFCO Stereo light unit 1950's -
OIGEO Stereo lens hood for use on Stemar when prism is not attached 1954-1957 ELC
OIMPO Prism for front of Stemar for subject distances beyond 10 feet; hinged front cover added in 1955 1954-1957 -
OIPVO Stereo viewer with independently focusing eye pieces; brittle plastic housing 1950's -
OIRZO-M Stereo unit complete with Stemar lens, OIGEO hood, prism, and viewfinder for M-mount cameras 1954-1957 -
OIRZO-S Stereo unit complete with Stemar lens, OIGEO hood, prism, and viewfinder for screw-mount cameras 1940-1953 -
OISBO Stemar stereo lens 1954-1957 -
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 Forum discussion [1] [2] 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 Forum discussion 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 Copy stand 25 1/2 inch column with guide rail 19??-19?? 16747
OLEYO Single exposure camera with Ibsor shutter used with Elmar 3.5, 5, and 10.5 cm lenses JCB's a little...15 1934-1935 LEICA CAMERAS HISTORICA
OLIGO Single exposure camera with Ibsor shutter used a variety of lenses JCB's a little...15 1934-1939 LEICA CAMERAS HISTORICA
OLLUX Hood for 35mm f/1.4 Summilux I 1961-19?? -
OLORA Single exposure camera without shutter 1936-19?? NY item
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 Forum discussion 1951-19?? LEICA CAMERAS HISTORICA
OMIFO Close focus accessory with parallax for 90mm f/4 Elmar lens 1949-1968 -
ONLIO Canvas carrying bag portion of OMEXO for Focoslide 1951-19?? LEICA CAMERAS HISTORICA
OOBAZ Late version focusing stage known as Focoslide for Screw-thread cameras using N series helical focusing lenses and extension tubes, see JCB Accessories 1958-19?? 16607
OOEUK 16 x 14 1/2 inch light box with 4 lamps 1951-19?? 16763
OOEVM 9 1/2 x 7 inch light box with 4 lamps Fontenelle archive 1951-19?? 16762
OOFRC Remote shutter release and winder operated by two chords 1936-19?? -
OOGAN OOBAZ Focoslide + VXZOO + VTOOX for Elmar f= 5 cm 1:2.8 1958-19?? 16632, 16603-3/8" bush
OOGIT OOBAZ Focoslide + VXOOT + VALOO for Elmar (III) f= 5 cm 1:3.5 1958-19?? 16633, 16604-3/8" bush
OOGUM OOBAZ Focoslide + ZOGOO for Focotar 1958-19?? 16634, 16612-3/8" bush
OOMAP OOTGU Focoslide + ZOGOO for Focotar 1956-19?? 16682, 16674-3/8" bush
OOMEX OOTGU Focoslide + VXZOO + VTOOX for Elmar f= 5 cm 1:2.8 1958-19?? 16633, 16604-3/8" bush
OOMYL OOTGU Focoslide + VSPOO + VTROO for Summicron 1956-19?? 16681, 16678-3/8" bush
OORES Rotating focusing mount with screen; early versions with single lens; 1937 double; slide-in and bayonet versions JCB's a little...17 1934-1950's LEICA CAMERAS HISTORICA
OORHY Leica 250 (models DD, FF & GG) nº 353696 1943 Fontenelle archive
OOTGU Late version focusing stage known as Focoslide for M-cameras using N series helical focusing lenses and extension tubes Forum discussion 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 Fontenelle archive 1938-1957 LEICA CAMERAS HISTORICA
OOZAB-G Focusing stage known as Focoslide for accepting Leica IIIg camera 1951-1957 see JCB Accessories
OOZEG Folding horse-shoe type copy stand portion of OMEXO for Focoslide 1951-19?? -
OOZIS Collapsible, horseshoe shaped copy stand 1939-19?? -
OOZKU Set of 5 extension rings for OOZIS copy stand 1939-19?? -
OOZMY Complete copy outfit including OOZAB, ZOOXY, ROOYH, VALOO, LVFOO and OPKOM release 1952-19?? -
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?? Fontenelle archive
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
OQWCO Lens cap Forum discussion 19??-19?? 14028
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 Forum discussion [3] [4] 1936-1962 14057
ORBMO Diopter correction lens for near-sightedness for Leica I-IIIa and Universal viewfinder 1941-19?? NY item
ORESO SPOOV copy stand + OORES rotating stage 1936-19?? -
ORLEO Diopter correction lens for astigmatism for Leica M-cameras to 1977 1956-1977 14062
ORMGO Diopter correction lens for astigmatism for Leica I-IIIa and Universal viewfinder 1941-19?? NY item
ORNIO Cap used without XOOIM hood on a Summilux (I) f= 5 cm 1:1.4 (originally) and also 50mm f/1.4 Summilux-M II - [5] 1959-1991 14036
OROBA Cap used with XOOIM hood (in reverse position) on a Summilux (I) f= 5 cm 1:1.4 (originally) and also 50mm f/1.4 Summilux-M II - Forum discussion [6] 1959-1991 14037
OROLF Lens turret for 3 lenses with handle; no more than 250 were made 1960
ORPDO A42 slip-over, chromed plated brass with felt lining front cap for 21mm f/3.4 Super-Angulon-R 1958-1963 14031
ORPNO Front cap for f = 12.5 cm 1:2.5 Hektor - with rear cap HGOOI it became a container for the lens JCB's a little...If 19??-19?? -
ORQPO Hood for Summarex f= 8.5 cm 1:1.5; early version was black with clamping screw, later chrome for bayonet fitting 1951-1960 12525
JCB's a little...IIIf
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 Forum discussion 1933-19?? 14061
ORTVO Cap that screws into body lens opening 19??-19?? 14055
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 Rear dust cap for screw lenses 1951-19?? 14050
OSBLO Magnifying eye-piece for 5 or 9 cm screw lens; converts lens to small telescope - see Photography Accessories for Monoscopes 1954-19?? Cosmonet OSBLO
OSERO Diopter correction lens for astigmatism for Visoflex magnifiers LVFOO and PEGOO 1960-19?? 14069
OTDYM Visoflex II without magnifier, bayonet mount Forum discussion 1962-19?? 16455
OTEMO Stemar attachment for subject distance of 3 - 10 meters; only 20 of these were delivered Forum discussion 1950's -
OTHEO 5 x stereo viewer 1950's -
OTPLO F = 20 cm 1:4.5 Telyt for Visoflex with hood SUNGO and later TNGOO 1935-1960 JCB's a little...11
OTPRO Visoflex extension tube for near focusing with universal focusing mount Forum discussion 1959-19?? 16471
OTQNO Visoflex ring addapter for Elmar 9 cm 1959-19?? 16468
OTRPO 1:1.25 magnification accessory for OTZFO focusing mount used with Visoflex II/ III ? 16471
OTSRO Adapter for use of 13.5 cm Hector lens with OTZFO focusing mount used with Visoflex II/ III Forum discussion 1959-19?? 16472
OTVXO 5x chimney eyepiece for Visoflex II Forum discussion 1962-19?? 16461
OTXBO 4x 90 degree eyepiece for Visoflex II Forum discussion 1962-19?? 16499
OTYDO Visoflex II without magnifier, screw mount Forum discussion 1962-19?? 16457
OTZFO Universal focusing mount for Visoflex II /Visoflex III for use with 1:3.5 / 65 Elmar, 90mm Elmarit and 135mm Elmar lenses Forum discussion ? 16464
Forum discussion
OUAGO Visoflex addapter for using Elmar 9 cm Forum discussion 1959-19?? 16467
OUBIO Visoflex II /Visoflex III adapter for Hektor 125 mm; Elmar and Hektor 135 mm in short mounts; TELYT Visoflex lenses Forum discussion [7] 1959-19?? 16466
Forum discussion
OUCLO Visoflex II with 4x 90 magnifier, screw mount 1962-19?? 16458
OUEPO Close-focus adaptor to be used with either the Summicron (II) f= 9 cm 1:2 in ZOOEP/16463 or 16462 adaptor or the 2.8/135 in 16462 adaptor. This usage will yield a 1:4.5 reproduction scale. Forum discussion 1959-19?? 16474
OUFRO Extension ring for 35/50mm M-bayonet lenses with 1:1 ratio ? 16469
OUFRO Visoflex extension ring for 5 and 3.5 cm lenses 1959-19?? 16469
OUTGU Similar to OOBAZ for M-cameras 1957-19?? see JCB Accessories
OUTSO Projection head to fit ground glass screen of Focoslide or Reprovit, see JCB Accessories 1951-19?? 16750
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
OZOFA V-Elmar f = 100 mm 1:4.5 enlarger lens for Focomat IIc 1959-1964 17878
OZPOM Visoflex I mirror reflex housing with M-mount 1954-1955 -
OZTFO Connector ring for the 65mm Elmar and 90 mm Elmarit to R-body Forum discussion 19??-19?? -
OZTNO Cable release addaptor for using screw release on M-camera Forum discussion [8] 1955-19?? 14088
OZTOM Double cable release for M-camera Forum discussion 19??-19?? 16491
OZUPO Visoflex I housing - JCB's Visoflex I Collection Fontenelle archive 1951-19?? 16484
OZWTO Double cable release for Visoflex I with time lock screw; early chrome and later black versions JCB's a little...11 Fontenelle archive 1951-19?? 16492 Fontenelle archive
OZWTO-M Double cable release for Visoflex I M-camera with time lock screw; early chrome and later black versions Forum discussion 1951-19?? 16491 Fontenelle archive
OZXOM Visoflex I with 5x chimney eyepiece, bayonet mount 19??-19?? 16482
OZXVO Cable release for Visoflex I for screw cameras only; pneumatic so called "sports release" 1954-19?? 16493 see JCB Bellows
OZYXO Visoflex I with 5 x chimney eyepiece LVFOO, screw mount 1951-1954 16485
OZYXO-M Visoflex I with 5 x chimney eyepiece LVFOO, bayonet mount 1955-1959 16482