Friedrich Deckel

[1] Zeiss also owned a significant portion of competitor Alfred Gauthier Calmbach [de] (AGC), which was later renamed Prontor after its competing leaf shutter.

[2] During World War II, photographic equipment production was paused and F.Deckel made fuel pumps for BMW airplane engines.

[3] In 1958, Carl Zeiss AG purchased F.Deckel outright and in 1976 closed down the Compur factor in Munich, consolidating production with Prontor at Calmbach.

[6] Deckel's popular, if expensive, line of industrial tool and cutter grinders remain available for sale under the brand ISOG,[7] a division of Precision Surfacing Solutions.

[11] Flash synchronization was added via a coaxial PC terminal on the rim of the shutter in 1951, which bore the Synchro-Compur branding.

Synchro-Compur shutters have an additional lever painted green, which allows the user to select electronic flash synchronization ("X") or flashbulb sync ("M").

Each EV corresponds to several combinations of shutter speed and aperture settings that provide the proper exposure for the illumination of the scene.

The original bayonet was introduced in 1956 with the Voigtländer Vitessa T, followed by the Braun Colorette Super II in 1957, which shared the 44.7 mm (1.76 in) flange focal distance with the earlier Exakta system.

[18] For instance, the Schneider-Kreuznach and Rodenstock lenses made for the Kodak Retina S-mount do not fit Voigtländer cameras directly; a small physical modification to the mounting lugs will make them compatible.

Zeiss Ikon folding camera equipped with a Tessar lens and a Deckel Compur rim-set shutter. Note the stylized "FD" branding on the right side of the shutter.
Clockwork mechanism within a Compur-Rapid leaf shutter; cocking lever at upper left and tripping lever at upper right; lever below cocking lever selects aperture.
Early Compur shutters used a dial at the 12 o'clock position to set the shutter speed; later versions used a ring coaxial with the lens.