In the end of 1933 German government ordered Siefrieg Guggenheimer to change the name of his company for something non-jewish. The company became Metrawatt AG, and at the same time Metrophot was changed to Metraphot.


Metraphot meters were manufactured in silver and black.

  1. -8 second scheiner

  2. -16 second scheiner

  3. -8 second DIN

  4. -16 second DIN

  5. -Kino version (KM8)

  6. -version with attachment shoe foot for Leica cameras


The first Metrawatt ad in ”Photofreund” 1/1934

German Bewi (originally founded in 1919), led by Ernst Bertram and Paul Will, made optical light meters succesfully from 1930 onwards. Their first photoelectronic meter was Electro-Bewi, released apparently in June 1934. It also had a simple optical extinction meter in case there was not enough light for selenium cell to work.

BEWI Electro-Bewi

In 1934 Rhamstine had fitted their light meter into a smaller case. Two models were made: MSA with black scale, and later MSB with white one. MSB also seems to have more sensitive cell, judging by the scale markings.


  1. -MSB was also made with Kodachrome scale


In autumn 1934 Metrawatt released their second model, Tempophot. The meter was now more conveniently design, and had a calculator and scales that rotate automatically according to desired aperture.


  1. -black or brown

  2. -Cine cersion

  3. -Leica version

Later versions with more sensitive cell:

  1. -Tempophot T4

  2. -Tempophot T8


The cover of the instruction leaflet.

NEXT PAGE >http://lightmetermuseum.com/1930s/Selenium_Meters_in_1930s/1935.html

Zeiss Ikon introduced its first photoelectric light meter at Leipzig Spring Fair 1934. Helios is a small meter usually made of maroon red bakelite.


  1. -First versions had max 1/500s. exposure time and convex cell window glass

  2. -After that max 1/1000s. exposure time

  3. -Later versions had flat glass

  4. -Sch, DIN and Sch+DIN versions were made

  5. -Black version with accessory shoe foot

  6. -Red version with accessory shoe foot


French Zeiss Ikon brochure 1934

Sch+DIN version with flat glass


  1. -The first version had a slightly different body than later ones

  2. -Scheiner scale

  3. -DIN scale

  4. -Early versions did not have wrist strap attachment

Later body version with DIN scale