03 Mar 3,000 UNITS PRODUCED OF THE THAMBAR 90 MM F/2.2 LENS Posted at 19:13h in by adminleica 0 Likes Between 1935 and 1939 approximately 3,000 units of this legendary lens were produced, the Thambar 90mm f/2.2. Max Berek develops the lightmeter, an apparatus for measuring light.