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BTLOO is the code word for the flash light attachment from 1935, the battery container clamped on the side of the camera secured by a thumb screw fitting into the tripod bush.
The pillar above the batteries container had holders to take one or two flash bulb.
The synchronization was via the rotation of the shutter speed dial when it was released.
The switch arrangement is slid into the accessory shoe and was engaged with the shutter speed dial by means of a cap which fitted over it.
BTLOO fitted Leica II, III and IIIa
Illustrations : a BTLOO fixed on a Leica III with by side an another one with the large capacity batteries container BWOOG (for professional use) and the genuine red cardboard box, Leitz, Germany Leica Blitzlicht - Auslöser embossed in gold.
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some details about the BTLOO : front
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rear : with the view on the special attachment in the accessory shoe :
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the shutter speed dial cap stored on top of the pillar :
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SYNCO ( 1938 ) New York ( Model V
) unit fitted onto the camera base plate via the tripod bush for Leica II, III,
IIIa and IIIb
BUNOO ( 1939 ) New type Wetzlar gun with internal synchronization through the
base plate. The camera base plate was replaced by a modified one to which the
flash gun was attached via a dovetail slide and operated in horizontal position.
Fitted all cameras with large diameter base plate pin up to the IIIb model.
BLITZ ( 1939 ) New York ( Model VI
)& ( 1942 ) model for IIIc ( Model VII
)same as BUNOO
SELSY ( 1947 ) New York ( Model VIII ) similar to BLITZ but with adjustable
milliseconds delay slider allowing synchronisation from 1/20s to 1/1000s.
Available with zero delay for electronic flashes.
For all Leica cameras with serial number above 111440 except IIc and IIIc.
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SELAN Angle bracket to enable unit to be utilized in a vertical position.
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difference, in lenght and shape, between SELSY and SELIS bases :
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SELIS New York ( Model VIIIa )as SELSY but for IIc and IIIc complete set in its genuine box :
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CEYOO (1950 - 1959) flash unit for
cameras with "f" synchronization.
Reflector folded like a fan. Battery capacitor type, capacitor began to charge
when a bulb is inserted.
Accepted AS or SCC Bulbs.
CTOOM / 15545 ( 1953 - 1964 ) adjustable bracket fixed to the base of the
camera, to allow the flash gun to be at the side at any angle through
180°.
At first this accessory was made in white plastic but in the mid 50's it was
made in black painted metal.
Illustrated items : CHICO flash unit on the CTOOM plastic base fixed on a 1954 Leica M3 and 1955 collapsible Summicron M 2/50 lens.
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Illustrated items : CEYOO flash unit on the CTOOM metal base with MOONZ connection cable fitted to a 1954 M3 and their genuine cardboard red boxes.
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CAVOO ( 1951 -
1953 ) Flash unit similar as CEYOO but for non synchronized Leica's camera.
An external synchronizer "Vacuu" is screwed onto the shutter release guard ring
thread and was operated by the rotation of a special cam shaped shutter speed
dial. Synchronisation was limeted at 1/100s.
There were two different synchronizers, one for bulb lamps and one for
electronic flashes, plus six speed dial for the different Leica's.
Illustration with CAVOO - B for IIIa and IIIb from n° above 226001. A SOOREI soft release is screwed on.
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DEOOC (1954 - 1959 )
Small "Chico" flash gun, capacitor type, fan type folding reflector
and plastic casing.
DHMOO Plastic box taking Chico outfit.
DFHOO / 15608 ( 1954 - 1965 ) pivoted holder with built in wiring making use of
flash cable unnecessary with Leica IIf and IIIf.
Items described above illustrated on a Leica IIIf from 1956 :
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ZIOOQ / 15546 (1954 - 1960 ) Supplementary extended accessory shoe for Leica If
and Ig when using flash and SBOOI viewfinder.
DEFOOB / 15609 pivoted holder but without built in wiring for all other synchronized
Leica's.
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