| Message: | Crysmit provides five kinds of lens forms, or shapes, that determine the imaging Characteristics of the lenses, they are Plano-convex, Plano-concave ,Double-convex,Double-concave and Meniscus.
Plano-convex lens has a positive focal length, which makes it ideal for collecting and focusing light for many imaging applications.
Plano-concave lens has a negative focal length and is used for image reduction or to spread light.
Double-convex lens has a positive focal length and is useful for 1:1 imaging and in multielement systems. also known as biconvex or equiconvex.
Double-concave lens has a negative focal length and is useful for 1:1 imaging and in multielement systems. also known as biconcave or equiconcave.
Meniscus lens has a positive or negative focal length, it forms a real or virtual image of objects.
Plano Convex Lens Plano Concave Lens Double Convex Lens
Double Concave Lens Positive Meniscus Lens Negative Meniscus Lens
Attribute Specification
Material N-BK7, H-K9L, Fused Silica, N-SF10, Silicon, CaF2, Sapphire, etc.
Typical Diameter (Фmm) 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.
Diameter Tolerance (mm) +0.0/-0.2 (General), +0.0/-0.02 (High Precision)
Paraxial Focal Length Tolerance (mm) ±2%
Centration 80% (Small Size), >95% (Large Size)
Surface Figure (per 25mm@632.8nm) |
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