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plano concave lens
Plano-concave lens has a negative focal length, diverges collimated incident light, and forms only virtual images which are seen through the lens. Because the spherical aberration of the Concave is negative, it can be used to balance the aberration of other lenses. It is often used to expand light beams or increase focal lengths in existing systems.
Material: grade A optical glass or Fused Silica                 
Diameter: smallest up to 2mm      
Diameter Tolerance: +0.0, -0.1 mm                                                Paraxial Focal Length Tolerance: ±2%    
Tc Tolerance: ±0.1 mm
Clear Aperture:  >85%
Surface Quality: 40-20 Sratch and dig
Surface Figure:N=3, △N=0.5
Centration: ±3 arc mins
Coating: Single layer MgF2 broadband AR coating
Protective Bevel    
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