GOSSEN SBC Profisix
The 1977 Gossen Profisix (in US Luna-Pro sbc) is a professional "system" exposure meter that can be fitted with a range of electrically connected accessories offering additional measurement facilities, including flash, enlarger metering, and colour temperature. The "Profi-System" line continued and ended with the Mastersix.
The 1981 Gossen Lunasix F (in US Luna-Pro F) was developed from the Profisix. In spite of its name, it is not related to the Lunasix at all, but does share the same range of clip on accessories. Flash metering was incorporated, however sensitivity was reduced compared to the Profisix as was the range of accessories (Profisix accessories will not fit the Lunasix F). The Lunasix F was Gossen's last professional meter with a mechanical moving needle display and the last without a microprocessor.
A lower cost version, the Gossen Lunalite (in US Luna-Lux), substituted the mechanical meter with an LED array. It has further reduced sensitivity and does not provide flash metering.
In spite of mechanical display and "computer" dial, these meters are electronic as circuitry to store the light reading is necessary for flash measurement. The electronics shut off after 30 seconds.
The Profisix was Gossen's flagship professional exposure meter and likewise its replacement Mastersix. The Lunasix F was positioned alongside the Lunasix and in turn was replaced by the Multisix. Both meters were high cost items.
The meter, soft case and strap
Cosmetic: Good condition, with signs of use