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Achromatic Doublet Lenses

Material:
Crown Glass and Flint Glass

Surface Flatness:
N<3, △N<λ/4

Focal Length:
+/-1% (EFL<1m)
+/-2% (EFL>1m)

Diameter Tolerance:
+0.0,-0.15mm

Surface Quality:
80/50~40/20

Clear Aperture:
>90%

Coating:
AR Coating,
Single Layer MgF₂

Center Thickness:
+/-0.2mm

An achromatic lens, also referred to as an achromat, typically consists of two optical components cemented together, usually a positive low-index (crown) element and a negative high-index (flint) element. In comparison to a singlet lens, or singlet for short, which only consists of a single piece of glass, the additional design freedom provided by using a doublet design allows for further optimization of performance. Therefore, an achromatic lens will have noticeable advantages over a comparable diameter and focal length singlet.
wdt_ID Attributes Value

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