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Negative crescent lens
Used with the longer radius facing the longer conjugate, these lenses（负弯月形透镜） act as a diverging element with less aberrations than plano-concave lens
Product details
Used with the longer radius facing the longer conjugate, these lenses（负弯月形透镜） act as a diverging element with less aberrations than plano-concave lenses.
产品指标如下：
Diameter tolerance +0,-0.005" (+0,-0.13 mm)
Center Thickness tolerance +/-0.008" (+/-0.2 mm)
Design Wavelength 10.6 microns
Focal Length Tolerance +/-2%
Surface Quality 60/40
Clear Aperture 90% Central Diameter
Wedge Angle <3 arc min
Surface Irregularity 1/20 l at 10.6 microns
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