This is an improved version of the 617 model which appeared in 1932.

The first Weston appeared in 1932 it was large with two selenium cells. The 650 model which was smaller and had a rectangular body was introduced in c.1934. A similar model calibrated specifically for cine work was introduced in 1937 called the 819. A model calibrated for the Leica was also produced. Production probably ended around 1940 with the introduction of the Weston Master range. The price was £5.18.6.

When using the cine model the film speed is set on the calculator dial which is then turned to match the f.p.s. to be used, the reading is then taken, the Relative Brightness value shown by the meter needle can then be found on the calculator which will point to the aperture to be used.

This is a simpler alternative to the Weston 650 and at £4 considerably cheaper. In use the light value is shown by a needle moving over a scale. That value is set against the emulsion speed by aligning a band showing light values with the emulsion speed shown on a fixed scale. The shutter speed / aperture pairs can then be read.