Martial: 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: ± Plusmn; 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: ± Plusmn; 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