Biconvex lens Ø 90.0 mm 4.0 dioptres made of optical glass, ground and polished

Size: Ø 90.0 mm
Optical power: 4 dioptres
Focal length: 250 mm
Rim thickness:
Centre thickness: 10.75 mm
Machine bevel with narrow cylindrical rim

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