Bi-Concave Lenses, China Bi-Concave Lenses, LENS004

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Bi-Concave Lenses

Product Name:Bi-Concave Lenses
Item No.: LENS004
Description:

(Minimum Order Quantity : 20 pcs forφ≥100mm, 50 pcs forφ<100mm )

This kind of lens has a negative focal length, diverges from collimated incident light and forms only virtual images that are seen through the lens. It is often used to expand light beams or to increase focal length in existing systems. Normally it is used in combination with other lenses. Usually it is symmetrical, but we can customize it upon the request. Our optical designers are always available to assist with your special needs and our production in China is ready to meet your quantity requirements.

Specifications
Diameter	φ4－φ300mm
E.F.L.	At the request of customers
Wavelength(λ)	At the request of customers
Material	BK7(K9) or as requested
Clear Aperture	>90%
Bevel	(0.25-1.0)mm× 45°(depends on the diameter)
Diameter Tolerance	+0.0/-(0.1-0.2)mm (depends on the diameter)
Focal Length Tolerance	±2 %
Centering Tolerance	4’ or as requested
Surface Figure	λ/4 or as requested
Surface Quality	60-40 s&d or as requested
C.T. Tolerance	±(0.1-0.25)mm (depends on the diameter)
E.T. Tolerance	Reference
Coating	At the request of customers

We specialize in production of medium to large-size series of custom lenses with exacting tolerances, high grade surface finish and difficult coatings. Please send us your specification or drawing and we will be happy to return a quotation ASAP. Our average response time is within 24 hours.

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