Bi – Concave lenses have spherical concave surfaces on both sides. Holmarc manufactures many of these lenses as standard products. These lenses find applications in expanding light or in increasing focal length of an optical system.
Diameter : 25mm
Focal Length : -40mm
Material : H-K9L(BK7 equivalent)
Design Wavelength : 587.6 nm
Effective Focal Length Tolerance : ± 1%
Surface Quality : 40 – 20 (scratch-dig)
Diameter Tolerance : +0.0, -0.2mm
Clear Aperture : > 90% of Diameter
Centering Tolerance : ≤3 arc min
Center Thickness, Tc : 2.5 mm
Coating : Uncoated
# Dispatch within 3 days
Model No. HO-BVL25-1.6
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