Murer et Duroni DU |
Version française |
Manufactured or assembled in Italy from (Circa) 1916 to (After) 1930.
Index of rarity in France: Rare (among non-specialized garage sales)
Inventory number: 13468
See the complete technical specifications
Chronology of cameras Murer et Duroni
This specimen belongs to the D series of the Murer and Duroni strut folding cameras, which corresponds to focal plane strut folding cameras without cross and rise movements. The shutter speed range (1/31 minimum speed) shows that it was made before the new shutters delivered from around 1925. The format 6 x 4,5 (model DU) was the last to be added to the series around 1916.
The body is made of wood and aluminum covered in leather. The viewfinder slides vertically over the lens on the front standard. The focal plane shutter is a Murer, delivering speeds in the range 1/31 to 1/1000. The non-self-capped shutter has constant tension, and the speeds are set by slit width, which is controlled from outside but checked on a scale on the internal back side (real speeds values inscribed and not slit width).
The lens is a Rex Luxior (Paris) with a focal length of 70 mm and maximum aperture of 5.5. This lens may indicate that the camera was commercialised in France - the equivalent Murer lens would be the Anastigmat 5,5, corresponding to model DU-E.
The Murer and Duroni DU strut folding focal plane camera with a Rex lens
At Murer and Duroni, Klapp cameras are divided into two major families: those with a focal plane shutter and those with a central shutter. They are then classified using a nomenclature consisting of 2 to 4 letters or numbers.
Focal plane shutter:
First letter | Second letter | Third and fourth letter | |||||||
D | Fixed front face | U | 4,5 x 6 | 2 | Anastigmat | Murer | f/7 | ||
F | Platine avant à décentrement | N | 6,5 x 9 ( O from 1914) | M | Anastigmat | Murer | f/6,5 | ||
L | 9 x 12 ( E from 1920) | T | Anastigmat | Murer | f/3,6 | ||||
C | 9 x 14 | E | Anastigmat | Murer | f/5,5 | ||||
K | 10 x 15 | R | Anastigmat | Murer | f/4,5 | ||||
H | 13 x 18 | 0 | Aplanat | Murer | f/8 | ||||
W | 45 x 107 mm (Stereo) | Si | Anastigmat | Koristka Sideran | f/4,5 | ||||
S | 6 x 13 (Stereo) | Ke | Anastigmat | Koristka Equator | f/5,5 | ||||
Ka | Anastigmat | Koristka Meridian | f/6,8 | ||||||
K | Anastigmat | Koristka Doppio Gauss | f/5,5 | ||||||
3 | Anastigmat | Goerz Dagor | f/6,8 | ||||||
4 | Anastigmat | Sintor | f/6,8 | ||||||
B | Anastigmat | Berthiot Olor | f/5,7 | ||||||
S | Anastigmat | Suter | f/5 | ||||||
L | Anastigmat | Roussel | f/4,5 | ||||||
Z | Anastigmat | Zeiss Iena | f/4,5 | ||||||
1 | Anastigmat | Zeiss Koristka Tessar | f/6,3 | ||||||
5 | Anastigmat | Primus | f/7 |
Central shutter:
First letter | Second letter | Third letter or number | |||||
U | 4,5 x 6 | L | Plate (simple) | 0 | Aplanat | Murer | f/8 |
N | 6,5 x 9 | F | Film-pack | 2 | Anastigmat | Murer | f/6,8 |
G | 9 x 12 | G | Film | 3 | Double anastigmat | Goerz Dagor | f/6,8 |
W | 4,5 x 10,7 (Stereo) | P | Plate and film-pack (premium) | M | Anastigmat | Murer | f/6,5 |
S | 6 x 13 (Stereo) | T | Plate (economical) | S | Anastigmat | Suter | f/6,8 |
I | 6 x 13 panoramique | M | Plate (metal) | ||||
A | 4 x 5 | ||||||
O | 4 x 6,5 |
Klapp cameras with a central shutter can come in three different finishes: economical, standard, or premium.
In the "economical" version, the body is made of alder wood and covered with imitation leather. The viewfinder is integrated into the front plate. The shutter offers only P (Time) and I (Instant) settings. The shutter is of the sector type. The metallic parts are oxidized. Its lens is achromatic. There is only one model of this type, which is a UT.
In the "standard" version, the body is made of aluminum and brass covered with morocco leather.
In the "premium" version, the body is made of aluminum and covered with morocco leather. A mechanism allows for moving the front plate forward to focus from 1.5 meters to infinity. The viewfinder is mounted on the sliding lens cover. The shutter speed can be adjusted to 1/25, 1/50, and 1/100.
(source Malavolti)
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