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Products & Services  >  Spherical Lenses  >  BK7 Positive Meniscus Lens
BK7 Positive Meniscus Lens
Positive meniscus lenses are used to decrease the focal length of another lens while maintaining the angular resolution of the optical assembly. These lenses are commonly used to achieve tighter beam focusing when paired with another positive lens.
Specifications:
Material .................................................................................BK7
Design Wavelength .......................................................546.1nm
Design Index ....................................................................1.5183
Diameter Tolerance ...............................................+0.0/-0.15mm
Paraxial Focal Length ...............±2%(f<400mm);±5%(f>=400mm)
Centration ..............................................................<3 arc minutes
Clear Aperture ......................................................................>90%
Surface Quality .....................................................................60-40
Bevel...............................................................................Protective
P/NfΦtctefb
30501100.025.44.02.597.5
30502125.025.44.02.8121.8
30503150.025.44.03.0146.3
30504175.025.44.03.1171.2
30505200.025.43.52.8197.0
30506250.025.43.52.9246.5
30507300.025.43.53.0296.3
30508350.025.43.53.1346.0
30509400.025.43.53.1395.8
30510500.025.43.53.2495.4
30511600.025.43.53.2595.3
30512800.025.43.53.3794.5
305131000.025.43.53.3993.7
305141500.025.43.53.41492.0
305152000.025.43.53.41990.2
305164000.025.43.53.53984.5
●Unit:mm
●Other sizes and coatings are available upon request.