Meniscus lens

The parameters of meniscus lenses can vary depending on specific products and application scenarios. The following are some common parameter types. Note that not all meniscus lenses will have these parameters marked. For specific details, you still need to refer to the product specification sheets or consult the suppliers: 

Material: Such as various flint glasses, UV fused silica, IR fused silica, calcium fluoride and other optical glasses [3].

Focal length: The focal length range can vary from a few millimeters to several thousand millimeters. For example, the focal length of some models is from ±5mm to ±1000mm, with a tolerance of ±1% [3].

Diameter: The tolerance range of the outer - diameter may be +0.0/-0.1mm [3].

Thickness: The tolerance of the center thickness may be ±0.1mm or less [3].

Radius of curvature: For double - convex or double - concave meniscus lenses, the radius of curvature is an important parameter that directly affects the focal length and imaging characteristics of the lens.

Surface quality: The surface quality may be represented by the number of scratches and pits, such as 40 - 20 (which means no more than 40 scratches and no more than 20 pits per square inch) [3].

Coating: Depending on the application requirements, meniscus lenses may be coated with various coatings, such as anti - reflection coatings and anti - glare coatings [5].

Effective aperture: Usually greater than a certain percentage (e.g., 90%), it represents the ratio of the diameter of the actual light - transmitting part of the lens to its total diameter [3].

Chamfer: The size of the chamfer may be 0.2mm×45° (which means the width of the chamfer is 0.2mm and the angle is 45 degrees) [3].