The Gossen Lunasix is a hand held exposure meter and famed for its low light sensitivity, still impressive by today's standards. It was Gossen's first light meter not based on a selenium light receptor. The styling, layout, and distinctive "computer" dial set the standard for successive Gossen meters until the advent of electronic displays.

The meter movement and operating mechanism are mechanical, however the CdS light cell requires battery power. Measurement is made by depressing the rocker switch in one direction for low light, and the other for daylight. When the rocker is released the needle remains clamped in place making transfer of the reading to the "computer" ring much easier.

Maker: 

Dates: 1961-1980

Variants: Lunasix, Lunasix 3, Lunasix 3s

Type: Ambient exposure meter

Display: Pointer needle with mechanical computer

Sensor: 

Measurement angle: 30° reflected, 180° incident

Multiple measurements: no

Ambient sensitivity: -8 to 24LV (Lunasix 3 -4 to 24LV)

Flash sensitivity: N/A

ASA/ISO range: ISO 8 to 2,500

Incident light: Yes

Reflected light: Yes

Flash measurement: No

Aperture range: f 1 to 90

Time range: 1/4,000s to 8 hours

Battery: 2×mercury (later 2×silver oxide)

Weight: 170g

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