Friedrich Deckel

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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. Zeiss Ikon Compur Tessar lens f=105 mm, f-4,5...32 23.06.18 JM.jpg
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.

Friedrich Deckel GmbH, also known as F.Deckel, was a German company founded by Friedrich Deckel and Christian Bruns in Munich as Bruns & Deckel in 1903. Its most famous product is the Compur line of leaf shutters used on many photographic lenses starting from 1911. Bruns and Deckel previously had worked together at C. A. Steinheil & Söhne; Bruns was an inventor responsible for developing leaf shutters while Deckel was a laboratory mechanic.

Contents

Corporate history

By 1910, Zeiss had acquired a 16.8% stake in F.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. [1]

Taking advantage of their growing knowledge of factory production methods and machinery, by about 1920 Deckel started producing "extra" machines for sale to the trade, most notably the versatile FP line of industrial milling machines. [2] During World War II, photographic equipment production was paused and F.Deckel made fuel pumps for BMW airplane engines. [1] By the end of the war, Deckel was also said to have produced a total of some 4100 examples of their FP1 milling machine for use in the war effort. [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. [1] Leaf shutter production continued after the two companies were merged in 1984 until 2002. [4] A portion of the company, responsible for gas monitors, survives as Compur Monitors GmbH. [5] Their FP3 milling machine remained in production until the late years of the 20th Century. [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. [8]

Leaf shutter development

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. Agfa Isolette compur-rapid shutter edited.jpg
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.

Bruns designed Steinheil's first leaf shutter in 1899, followed by an updated version using a leather brake to control shutter speeds. [1]

While at Bruns & Deckel, Bruns developed the Compound leaf shutter in 1905, which had a pneumatic escapement for slow speeds. [1] After Bruns left the company shortly thereafter, it was renamed to F.Deckel; Bruns continued to develop shutters and replaced the pneumatic cylinder with a clockwork escapement in 1910, [9] naming the new shutter Compur as a portmanteau of Compound (from the earlier shutter design) and Uhrwerk (referring to the clockwork mechanism). [1] A consortium of photographic companies, including Carl Zeiss AG, Bausch & Lomb (25% of which was owned by Zeiss), and AGC was formed in 1910 to acquire Bruns's Compur patent, which was provided to Deckel, who produced Compur shutters under license starting in 1911. [1] Zeiss owned significant stakes in both Deckel and Gauthier. [1] The earliest shutters are marked with D.R.P. (Deutsches Reichs-Patent  [ de ]) 258646 D.R.G.M. (Deutsche Reich Gebraumeister) for the original patent.

Leaf shutters are provided in standardized sizes. Compur shutters were marketed with smaller lenses (sizes #00 to #3), while Compound shutters continued to be provided for larger sizes (#4 and #5). [10]

Compur shutter dimensions [11]
Size
Dimension
#00#0#1#2#3
Body diameter45.2 mm (1.78 in)58 mm (2.3 in)70.5 mm (2.78 in)80.5 mm (3.17 in)
Front lens threadM22.5-0.5M29.5-0.5M40-0.75M45.75-0.75M58-0.75
Rear lens threadM36-0.75
Depth16 mm (0.63 in)20 mm (0.79 in)26.5 mm (1.04 in)
Front to iris9.3 mm (0.37 in)10.2 mm (0.40 in)10.75 mm (0.423 in)14.5 mm (0.57 in)31.5 mm (1.24 in)
Mount flange threadM25.0-0.5M32.5-0.5M39-0.75M50-0.9M62-0.75
Lens board hole diameter26.3 mm (1.04 in)34.6 mm (1.36 in)41.6 mm (1.64 in)52.5 mm (2.07 in)65 mm (2.6 in)
Maximum iris diameter17.4 mm (0.69 in)24 mm (0.94 in)30 mm (1.2 in)35 mm (1.4 in)45 mm (1.8 in)
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. Compur.jpg
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.

As introduced, the Compur leaf shutter used a dial to set shutter speeds; the early dial-set versions were succeeded by the rim-set version in 1927, [1] which moved the shutter speed control to the outer rim of the shutter. [12] A self-timer mechanism was added in 1928, which was labelled Compur S. [13] [14]

The Compur leaf shutter initially provided speeds of up to 1250 sec; the later models (denoted by Compur-Rapid) extended the fastest shutter speed to 1500 (#00) and 1400 (#0) in 1935. [13] AGC released the similar Prontor leaf shutter design in 1935. [1] The fastest speed should be selected prior to cocking the shutter, as a stiff secondary spring is engaged with the fastest speeds; other speeds may be selected after the shutter is cocked. In addition, the self-timer cannot be used with the fastest shutter speed. [15] Early versions use three leaf blades, while Compur-Rapid versions used five. [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"). [15] Some Compur shutters have a trailing -P, indicating these shutters offer "press to focus" functionality. A separate button is provided that allows the photographer to open the shutter leaves to check focus on the ground glass without changing the shutter speed setting or tripping the shutter. [11]

In the early 1970s, Deckel introduced electronically controlled shutters, branded as Compur-electronic. The 4.5 V PX21 battery required to operate these shutters is now out of production. [11]

Exposure value

F.Deckel developed the exposure value (EV) scale, also known as the Light Value Scale, which is a single number that measures scene illumination on a base-2 logarithmic scale. Each EV corresponds to several combinations of shutter speed and aperture settings that provide the proper exposure for the illumination of the scene. [16] The EV scale was first used on Synchro-Compur shutters displayed at Photokina 1954. [17]

Deckel-mount lenses

In the late 1950s, Deckel introduced a bayonet lens mount which was used mainly with 35mm leaf-shutter cameras built in Germany, including the Kodak Retina IIIS, Kodak Retina Reflex S, Braun Paxette Reflex, and Voigtländer Bessamatic. DKL-mount lenses for the Kodak cameras were made by both Schneider-Kreuznach and Rodenstock, while Voigtländer made their own lenses for the Bessamatic line. DKL-mount lenses became less popular as focal-plane shutter cameras became more prevalent in the 1960s, and production ceased by the early 1970s.

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. Although the DKL-mount system is ostensibly compatible across manufacturers, camera manufacturers introduced variations in the mounting lug profiles and inclusion of an aperture control ring to physically prevent the attachment of lenses from other DKL-mount systems. [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. This was intended to prevent Voigtländer photographers from using less expensive Retina lenses. [19]

DKL lens mount cameras include seven distinct variants (the earliest models released, Voigtländer Vitessa T and Braun Colorette Super II, share the same physical mount):

DKL-mount variants [18]
Lens
Camera
ENNA Rodenstock Schneider Kreuznach Staeble  [ de ] Steinheil  [ de ] Voigtländer
BaldaBaldamatic IIIDark Red x.svg NoDark Red x.svg NoGreen check.svg Yes: Curtagon 2.8/35, Xenon 1.9/50, Xenar 2.8/50, Tele-Xenar 4/135Dark Red x.svg NoDark Red x.svg NoDark Red x.svg No
Braun Colorette Super II [lower-alpha 1] Dark Red x.svg NoGreen check.svg Yes: Eurygon 4/35, Ysarex 2.8/50, Rotelar 4/85 & 4/135Green check.svg Yes Radiogon 4/35, Xenar 2.8/50, Tele-Arton 4/85Dark Red x.svg NoGreen check.svg Yes: Culmigon 4.5/35, Culminar 2.8/50Dark Red x.svg No
Paxette ReflexGreen check.svg Yes: Lithagon 3.5/35Green check.svg Yes: Rotelar 4/135Green check.svg Yes: Xenar 2.8/50Green check.svg Yes: Ultralit 2.8/50Green check.svg Yes: Culmigon 4.5/35, Quinon 1.9/50Dark Red x.svg No
Iloca ElectricDark Red x.svg NoGreen check.svg Yes: Eurygon 4/35, Heligon 1.9/50, Ysarex 2.8/50, Rotelar 4/135Dark Red x.svg NoDark Red x.svg NoGreen check.svg Yes: Culmigon 4.5/35, Quinon 1.9/50, Culminar 2.8/50Dark Red x.svg No
Kodak Retina IIIS, Retina Reflex S / III / IV, Instamatic Reflex Dark Red x.svg NoGreen check.svg Yes: Eurygon 2.8/30, Eurygon 4/35, Heligon 1.9/50, Ysarex 2.8/50, Rotelar 4/85 & 4/135Green check.svg Yes: Curtagon 4/28 & 2.8/35, Xenon 1.9/50, Xenar 2.8/45 & 2.8/50, Tele-Arton 4/85, Tele-Xenar 4/135 & 4.8/200Dark Red x.svg NoGreen check.svg Yes: Culminar 2.8/50Dark Red x.svg No
Voigtländer Bessamatic, Ultramatic Dark Red x.svg NoDark Red x.svg NoDark Red x.svg NoDark Red x.svg NoDark Red x.svg NoGreen check.svg Yes: Skoparex 3.4/35, Skopagon 2/40, Color-Skopar X 2.8/50, Color-Lanthar 2.8/50, Septon 2/50, Dynarex 3.4/90 & 4.8/100, Super-Dynarex 4/135, 4/200, & 5.6/350, Zoomar 2.8/36~82
Vitessa T [lower-alpha 2] Dark Red x.svg NoDark Red x.svg NoDark Red x.svg NoDark Red x.svg NoDark Red x.svg NoGreen check.svg Yes: Skoparet 3.4/35, Color-Skopar 2.8/50, Dynaret 4.8/100, Super-Dynaret 4/135
Wirgin Edixa electronicaDark Red x.svg NoDark Red x.svg NoGreen check.svg Yes: Curtagon 4/28 & 2.8/35, Xenon 1.9/50, Xenar 2.8/50, Tele-Xenar 4/135Dark Red x.svg NoGreen check.svg Yes: Culminar 2.8/50, Quinon 1.9/50Dark Red x.svg No
DKL-mount lenses
Focal lengthApertureManufacturerNameConstructionMin. FocusAccessory sizeNotes / Refs.
Wide-angle lenses
28 mmf/4 Schneider-Kreuznach Retina Curtagon7e/6g3.0 ft (0.91 m)60 mm [20] [21] [22] :29 [19]
30 mmf/2.8 Rodenstock Retina Eurygon7e/6g ?60 mm [20] [19] [23] :Fig.19
35 mmf/2.8 Schneider-Kreuznach Retina Curtagon6e/6g [lower-alpha 3] 3.0 ft (0.91 m)32 mm [20] [21] [22] :29 [19]
35 mmf/3.4 Voigtländer Skoparex6e/5g3.3/1.3 ft (1.0/0.4 m) [lower-alpha 4] 40.5 mm [24] [25]
35 mmf/4 Rodenstock Retina Eurygon5e/5g ? [20] [26] [23] :Fig.19
35 mmf/4 Schneider-Kreuznach Radiogon5e/4g ? ? [27] :108
40 mmf/2.0 Voigtländer Skopagon9e/6g3.0/1.6 ft (0.9/0.5 m) [lower-alpha 4] 54 mm [24] [25]
Standard / Normal lenses
Focal lengthApertureManufacturerNameConstructionMin. FocusAccessory sizeNotes
45 mmf/2.8 Schneider-Kreuznach Xenar4e/3g
(Tessar)
3.3 ft (1.0 m) [21]
50 mmf/1.9 Rodenstock Retina Heligon ? ?60 mm [20] [22] :29
50 mmf/1.9 Schneider-Kreuznach Xenon6e/4g
(Double-Gauss)
2.0 ft (0.61 m)60 mm [20] [21] [22] :29 [27] :112
50 mmf/1.9 Steinheil  [ de ]Quinon6e/4g
(Double-Gauss)
 ? ? [27] :108
50 mmf/2.0 Voigtländer Septon7e/5g3.0/2.0 ft (0.9/0.6 m) [lower-alpha 4] 54 mm [24] [28]
50 mmf/2.8 Rodenstock Retina Ysarex4e/3g
(Tessar)
 ?32 mm [20] [26] [22] :29 [23] :Fig.19
50 mmf/2.8 Schneider-Kreuznach Retina Xenar4e/3g
(Tessar)
 ?32 mm [20] [26] [22] :29
50 mmf/2.8 Steinheil  [ de ]Culminar4e/3g
(Tessar)
 ? ? [27] :103
50 mmf/2.8 Voigtländer Color-Lanthar3e/3g3.3 ft (1.0 m)40.5 mm [24] [28]
50 mmf/2.8 Voigtländer Color-Skopar X4e/3g
(Tessar)
3.3/2.0 ft (1.0/0.6 m) [lower-alpha 4] 40.5 mm [24] [28]
Telephoto lenses
Focal lengthApertureManufacturerNameConstructionMin. FocusAccessory sizeNotes
85 mmf/4 Schneider-Kreuznach Retina Tele-Arton5e/4g6.0 ft (1.8 m)32 mm [20] [21] [22] :29 [27] :110
85 mmf/4 Rodenstock Retina Rotelar5e/4g ?32 mm [20] [26] [22] :29 [23] :Fig.19
90 mmf/3.4 Voigtländer Dynarex5e/4g6.6 ft (2.0 m)40.5 mm [24] [29]
100 mmf/4.8 Voigtländer Dynarex6e/4g3.3 ft (01.0 m)54 mm [24] [29]
135 mmf/4 Schneider-Kreuznach Retina Tele-Xenar5e14 ft (4.3 m)60 mm [20] [21] [lower-alpha 5]
135 mmf/4 Rodenstock Retina Rotelar5e/4g ?60 mm [20] [26] [23] :Fig.19 [lower-alpha 5]
135 mmf/4.0 Voigtländer Super-Dynarex4e/3g13.1 ft (4.0 m)40.5 mm [24] [30]
200 mmf/4.0 Voigtländer Super-Dynarex5e/4g27.9 ft (8.5 m)77 mm [24] [30]
200 mmf/4.8 Schneider-Kreuznach Retina Tele-Xenar7e28 ft (8.5 m) [21]
350 mmf/5.6 Voigtländer Super-Dynarex7e/6g91.9 ft (28.0 m)95 mm [24] [30]
Zoom lenses
Focal lengthApertureManufacturerNameConstructionMin. FocusAccessory sizeNotes
36–82 mmf/2.8 Voigtländer Zoomar 14e/11g4.3 ft (1.3 m)77 mm [24] [31] [32]
Notes
  1. Lenses are compatible with the Voigtländer Vitessa T
  2. Lenses are compatible with the Braun Colorette
  3. Kodak literature states 5e. [21]
  4. 1 2 3 4 Original (Series 1) lenses had longer minimum focus distance, which was improved in later versions.
  5. 1 2 Accepts "T I/60" close-up lens to shorten minimum focusing distance. [26]

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