Plano-convex lens Ø 50.0 mm made of optical glass, ground and polished in 2 different magnifications in 8.0 diopters and 13 diopters

Size: Ø 50.0 mm
Optical power: 8 diopters
Focal length: 125 mm
Rim thickness:
Centre thickness: 6.4 mm
cylindrical rim 1 - 2.5 mm (pressed edge)

Size: Ø 50.0 mm
Optical power: 13 dioptres
Focal length: 77 mm
Rim thickness: 2.0 ±0.2 mm
centre thickness: 10.9 ±0.2 mm
Cylindrical rim 1 - 2.5 mm (pressed edge)

Tolerances:

From 40 mm Ø the size tolerances are subject to the deviations from the nominal dimension that the raw glass compacts exhibit.

These are:

for 40 - 75 mm Ø -0.3 mm
for 75 - 120 mm Ø -0.5 mm
over 120 mm Ø -0.8 - 0.9 mm