meniscus lens can increase the na of the system while onlyadding slightly to the total spherical aberrations. the negativemeniscus lens is used to increase the focal length of anotherlenswhilemaintaining the angular resolution of the optical assembly.this lens shape is best used when one conjugate is relatively farfrom the lens.
specifiction of our meniscus lens as follow:
*material bk7 or other optical materials
*dimension tolerance +0.0~-0.1mm
*center thickness +/-0.1mm
*focal length tolerance+/-1%
*surface quality:40/20
*surface figure:lambda/2 at 633nm on plano side
*clear aperture >90%
*chamfer 0.25mm at 45 degree typical
*coating optional

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VYOpticsPhotoelectricTechnologyCo.,Ltd.
Molloy
18243052623
Changchun