Meniscus Lenses: The Positive Meniscus can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens. The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.
We supply kinds of Plano-Convex Spherical Lens,Plano-Concave Spherical Lens,bi-convex Spherical Lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our optical meniscus spherical lens as follow:
Meniscus Spherical Lens,Meniscus Spherical Lenses,Optical Glass Meniscus Lens,Glass Meniscus Lens China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com
Magnet Bar Strong Bar Magnet Prices
 Product Description:
1. Materials: Neodymium magnet (Ne-Fe-B)
2. Shape: custom shape
3. Certificate: ISO/TSI6949: 2009, RoHS
4. Powerful: Neodymium magnets (sintered NdFeB magnets) are more powerful than any other permanent magnet material in the market today.
5. Wide product range: N35-N54, 35M-52M, 33H-50H, 33SH-45SH, 30UH-42UH, 30EH-38EH, and 28AH-33AHB.Â
6. High performance: High intrinsic coercive force (up to 35KOe) and energy product (up to 55MGOe), the maximum working temperature of 230 degrees Celsius.
7. Competitive price: Very competitive price (lower than market average) due to mass production.
8. Coating: All the neodymium magnets oxidize rapidly when exposed, so an anti-corrosive coating (usually electroplating) is used to extend their working life. such as Ni, Zn, gold, copper, epoxy, chemical, parylene and so on;
9. Applications: Magnet Separators, Sensors, Motors, Rotors, Wind turbines, Wind generators, Loudspeakers, Magnetic hooks, Magnetic holder, Filters Automobiles Magnetic jewelries, toys, magnetic buttons, Magnetic therapy and so on;
10. Quality: As to give good service, quality of each piece is guaranteed. Every piece of magnets is tested by ISO/TS 16949:2009.
11. Caution: You should be extremely careful when install neodymium magnet, as they can easily pinch fingers.
12. No for Kids: NdFeB magnets are not suitable for children.
Production process:Â
Raw Materials-->Mixture--->Vacuum Melting--- > Powder Production--- >Molding ---> Vacuum Sintering--- > Testing--- >Mechanical Processing--- > Surface Coating--- >Magnetized--- > Inspecting--- > Packing and ShippingDirections of Magnetization:
Directions of magnetization
a. Thickness Magnetized
b. Axially MagnetizedÂ
c. Diametrally Magnetized
d. Multi-poles magnetized
e. Radial MagnetizedÂ
f. Customized specific requirements magnetized
 Inquiry  Â
To receive a quote for Neodymium magnets, please provide the following details:Â
(01) Outer Diameter, Inner Diameter or, Degree of Angle;
(02) Thickness, Length;
(03)Â Grades;
(04)Â Coating;
(05) Tolerances and Magnetization Direction (North on the Outside Face / South on the Outside Face / Magnetized through Circumference / Magnetized through Thickness ).Â
(06) Testing Conditions
  
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional