Practos - Antique and Vintage Cameras

Practos

Image of Practos

Meter Type:
Extinction.

Calibration:
Plate Speed: Autochrome, 5 - 29 Scheiner, 17 - 5600 H&D. Shutter speed: 1/400 - 60m. 1 - 128 f.p.s. Aperture: f1.3 - f48, f2 - f41.

Attributes:
The eye-piece shows shutter speed values. The film speed is set on one ring. The end of the barrel is twisted until the extinction point is reached, the shutter speed and aperture pairs can then be read on the barrel. Eyesight correction to viewfinder. Filter factor. Depth-of-field scale for 7.5cm, 10.5cm and 13.5cm lenses.

Practos Junior

Meter Type:
Extinction.

Calibration:
Plate Speed: 11 - 32 Scheiner, 75 - 11000 H&D, 3 - 24 DIN. Shutter speed: 1/400 - 4m, index for cine at 1/32. Aperture: f1.2 - f50.

Attributes:
The eye-piece shows the complete range of shutter speeds, the least distinct is set on a scale against the film speed, the shutter speed and aperture pairs can then be read on the barrel. Eyesight correction to viewfinder.

Practos Junior

Meter Type:
Extinction.

Calibration:
Plate Speed: 11 - 32 Scheiner, 75 - 11000 H&D. Shutter speed: 1/400 - 4m, index for cine at 1/32. Aperture: f1.2 - f50, f1.4 - f45.

Attributes:
The eye-piece shows the complete range of shutter speeds, the least distinct is correct for a set aperture of f6.3 and film speed of 2700 H&D for other values the shutter speed shown is set on a scale against the film speed, the shutter speed and aperture pairs can then be read on the barrel. Eyesight correction to viewfinder.

Practos

c. 1950

Practos Photo Products

Hamburg

West Germany

Meter Type:
Extinction.

Calibration:
Plate Speed: 16 - 40 European Scheiner, 6 - 30 DIN, 3 - 800 ASA. Shutter speed: 1/400 - 4m, index for cine at 1/32. Aperture: f1 - f32.

Attributes:
The eye-piece shows the complete range of shutter speeds, the least distinct is set on a scale against the film speed, the shutter speed and aperture pairs can then be read on the barrel. Eyesight correction to viewfinder.

Practoskop

1931

Meter Type:
Extinction.

Calibration:
Plate Speed: Autochrome, 4 - 30 Scheiner, 17 - 5600 H&D. Shutter speed: 1/400 - 60m. Aperture: f1.8 - f48.

Attributes:
The eye-piece shows shutter speed values. The film speed is set on one ring. The end of the barrel is twisted until the extinction point is reached, the shutter speed and aperture pairs can then be read on the barrel. Eyesight correction to viewfinder.

With:
Pouch.

A new model of the Practos was advertised in the mid 1930s, with this model the finder showed an image of the scene, it also included a depth-of-field scale.

References & Notes:
BJA 1952, p. 37. BJA 1954, p. 47. Westminster Cat. 1939, p. 55. Minit&Cine 1939, pp. 39, 179. Ensign Cat. 1936, p. 203.

Extinction

Photometre
Le Photometre Normal

Heyde

Diaphot

Wellington, McMurtry, Low's

Justophot

Lios Actinometer, Lios Scop

Practos

Dremoscop, Leicascop
Instoscope

Bewi

Leudi, Imperial, Pierce
Hauff, Expophot

Corfield
Nebro Visual
Ludac

Addiphot, Addex
Perfectus

Pelmet, Plex, Rollei


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