The Mighty Omega:
Leudi 3 Extinction Meter
The Mighty Omega:
Bewi Quick Light Meter
The Mighty Omega:
Expophot Extinction Meter
The Mighty Omega:
Addiphot Extinction Light Meter
The Mighty Omega:
Bertram Bewi Junior Model II
The Mighty Omega:
Zeiss-Ikon Diaphot
The Mighty Omega:
Bertram Amateur