The 1960's Gossen Lunasix 3 is a hand held exposure meter. Sold for many years the Lunasix was famed for its low light sensitivity, still impressive by today's standards. It was the company'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.
This light meter comes with two original px625 mercury cell batteries installed and in working order. These can be replaced when need should arise with MRB625 zinc-air batteries available readily online.
Meter is in perfect working condition and instruction manual can be found and downloaded free here:
Comes with original leather case
Variants: Lunasix, Lunasix 3, Lunasix 3s
Type: Ambient exposure meter
Display: Pointer needle with mechanical computer
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)
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