Specifications:
Material: BK7 grade A optical glass
Material: or other optical material
Dimension Tolerance: + 0.0/-0.1mm
Center Thickness: ± 2mm
Focal Length Tolerance: ± 1%
Surface Quality: 60-40
Surface Figure: λ /2 @ 633nm on plano side
Clear Aperture: > 90%
Parallelism: < 1'
Bevel: 0.25mm x 45 degree
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