Plano Concave Lens 50.8mm Diameter −70mm Focal Length Uncoated

SLB-50.8-70N

These simple negative lenses have many uses. Alone they form a virtual image of a distant object or collimated light source. Used in combination with other optics they reduce the power of the system. Sharp edges which are common in negative lenses are removed by beveling in order to reduce the likelihood of chipping.
◦There are three types of plano concave lenses available; BK7 for use in visible range to infrared wavelength range.
◦BK7 lenses are also available with three types of anti-reflection coatings, visible wavelength range, in the near-infrared range and in the infrared range.
◦Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.
More Information
Name Plano Concave Lens 50.8mm Diameter −70mm Focal Length Uncoated
Weight 0.0500kgs
Standard Coatings Available Yes
Guide
  • Lenses are available in a large selection and in custom sizes and focal lengths.
  • In addition to our standard coating we offer custom anti-reflective coating at specific wavelengths.
Remark -
Attention
  • Plano concave lenses are negative lenses that diverge collimated incident light and are primarily used in conjunction with plano convex lenses to shape beams.
  • The plano-concave lens has chromatic aberration, the focal length will vary depending on the wavelength. Please check the “wavelength characteristic of the focal length data” on “Technical Data” for the focal lengths of each wavelength.
  • The plano concave lenses are designed for parallel light to be incident to the concave surface.
  • Transmissions losses due to reflection off the front and rear surfaces of the lens can be minimized by coating the surfaces. Consult our Sales Division for anti-reflection coatings suitable for your application.
  • Sharpe edges are common in negative lenses are removed by beveling in order to reduce chipping may result in smaller then edge thickness. Thicknesses listed in tables are to theoretical sharp edge.
Diameter φD 50.8mm
Focal length 70mm
Material BK7
Design Wavelength 546.1nm
Refractive index n<sub>e</sub> 1.519
Coating Uncoated
Clear aperture 90% of the diameter
Surface Quality (Scratch-Dig) 20-10
Wavelength range of Antireflection Coating Uncoated
Diameter φD φ50.8mm
Focal length f −70mm
Edge thickness te 13.4mm
Center thickness tc 3mm
Back focal length fb −72.0mm
Radius of curvature r 36.33mm
Centration <1′
In stock
SKU
SLB-50.8-70N
£47.90

Delivery in : 3-5 days

These simple negative lenses have many uses. Alone they form a virtual image of a distant object or collimated light source. Used in combination with other optics they reduce the power of the system. Sharp edges which are common in negative lenses are removed by beveling in order to reduce the likelihood of chipping.

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