Collection of B&L Macro Tessars
Clockwise from left 48mm,32mm, 16mm and 72mm.
All are four element reverse tessars.
The 16mm lens has no adjustable iris, the permanent field stop is set for
optimum sharpness at it's design magnification (10-20X) (approx f/5)
Macro Tessars are coated. Prewar lenses of this type are similar but are uncoated and are labeled "Micro Tessar"