Material H-K9L(Borosilicate Crown Glass)
Diameter Tolerance +0.0/-0.10mm(≤ 60mm)
+0.0/-0.15mm(>60mm)
Centering Accuracy <0.1mm(F. L≤ 40mm)
<2.5mrad(F. L>40mm)
Focal Length Tolerance ± 0.2%(<10mm)
± 2.0%(<10-1000mm)
± 5.0%(>1000mm)
Edge/Centre Thickness Tolerance ± 0.35mm
Clear Aperture Diameter >90% of central diameter
Surface Accuracy λ/10@632.8nm(≤ 300mm)
λ/4@632.8nm(>300mm)
Surface Quality 40-20 scratch/dig
Diameter Tolerance +0.0/-0.10mm(≤ 60mm)
+0.0/-0.15mm(>60mm)
Centering Accuracy <0.1mm(F. L≤ 40mm)
<2.5mrad(F. L>40mm)
Focal Length Tolerance ± 0.2%(<10mm)
± 2.0%(<10-1000mm)
± 5.0%(>1000mm)
Edge/Centre Thickness Tolerance ± 0.35mm
Clear Aperture Diameter >90% of central diameter
Surface Accuracy λ/10@632.8nm(≤ 300mm)
λ/4@632.8nm(>300mm)
Surface Quality 40-20 scratch/dig
Main Products
optcal lenses, optical mirrors, telescope lenses