The material is Crown, BK-7! It has a negative focal length, which reduces the image size and diverges the light rays.
"Biconcave lenses" have a stronger power to diverge light beams compared to plano-concave lenses, making them suitable for use in lighting systems and finite imaging when combined with convex lenses. The main applications include telescopes, binoculars, cameras, and flashlights. They have a negative focal length, which allows them to reduce images and diverge light rays. Additionally, we accept custom orders for anti-reflective coatings and other specifications. 【Specifications】 ■ Material: Crown, BK-7 ■ Refractive Index: Crown (1.5230/nd, 1.5251/ne), BK-7 (1.51680/nd, 1.51872/ne) ■ Design Wavelength: 587.6nm (d line) ■ Chamfering (45°) with protective chamfering ・φ5: 0.1mm ・φ10 to φ100: 0.2mm *For more details, please download the PDF or feel free to contact us.
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basic information
[Tolerance] ■Diameter: +0mm/-0.1mm ■Center thickness: ±0.2mm ■Focal length: ±2% ■Eccentricity: Within 3 minutes ■Surface quality: MIL60-40 *For more details, please download the PDF or feel free to contact us.
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Applications/Examples of results
【Main Uses】 ■Telescope ■Binoculars ■Camera ■Flashlight ■Peephole for the entrance, etc. *For more details, please download the PDF or feel free to contact us.
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Company information
This is an optical manufacturer with over 110 years of history, originating from Sugita Glass Instrument Store founded by Tōtarō Sugita in 1906 (Meiji 39). The main business is the research and manufacturing of glass, and for many years, it has supplied a wide variety of glass products to various fields. In 1982, the company changed its name to Sugito Co., Ltd. and promoted business expansion, designing, developing, manufacturing, and selling optical elements such as optical lenses and prisms, glass products like special lenses and magnifying glasses, as well as optical products and components including macro zoom lenses, microscopes, various scopes, and inspection equipment. Additionally, in 1993, a factory was newly established in Thailand to enhance the production capacity of glass products and lenses. The company keeps standard optical elements and lens systems in stock at all times and can sell from a single unit. It also handles the design, development, and manufacturing of optical elements and lens systems according to customer requests, so please feel free to inquire.
![Biconcave lenses [Available in various sizes, substrates, and coatings!]](https://image.mono.ipros.com/public/product/image/cb4/2000418518/IPROS3999118970986523384.jpg?w=280&h=280)
