Pictures and drawings of Positive meniscus lenses:
Specifications:
Material:
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BK7, Fused Silica, SF10, CaF2, Sapphire .etc.
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Paraxial Focal Length Tolerance:
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±2%
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Dimension Tolerance:
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±0.2(General). ±0.05(High Precision)
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Centration:
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<3 arc min
|
IRR:
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λ/4@633nm（General),λ/10@633nm(High Precision)
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Clear Aperture:
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>80%(Small Size), >95%(Laege Size)
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Surface Figure:
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<1.5λ@633nm（General),<λ/4@633nm(High Precision)
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Surface Quality:
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60/40（General),10/5(High Precision)
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Bevel:
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<0.25mm
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Coating:
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Uncaoted, AR,PR, HR, etc.
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Positive meniscus lenses are designed
to minimize spherical aberration. When used in combination with another
lens, a positive meniscus lens will shorten the focal length and
increase the numerical aperture (NA) of the system without introducing
significant spherical aberration.
Positive meniscus (convex-concave) lenses are designed to minimize spherical aberration. When a positive meniscus lens is used in combination with another lens, a positive meniscus lens will shorten the focal length and increase the numerical aperture (NA) of the system without introducing significant spherical aberration.
