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Diameter (mm):
12.50 +0.0/-0.025
Effective Focal Length EFL (mm):
-20.00
Focal Length Tolerance (%):
±1
Back Focal Length BFL (mm):
-22.88
Focal Length Specification Wavelength (nm):
587.6
Clear Aperture CA (mm):
11.50
Centering (arcmin):
<1
Center Thickness CT (mm):
5.50 ±0.10
Center Thickness CT 1 (mm):
2.00 ±0.05
Center Thickness CT 2 (mm):
3.50 ±0.05
Radius R1 (mm):
-13.80
Radius R2 (mm):
9.99
Radius R3 (mm):
109.48
Edge Thickness ET (mm):
7.01
Substrate:
Many glass manufacturers offer the same material characteristics under different trade names. Learn More
TECHSPEC® MgF2 Coated Negative Achromatic Lenses consist of two optical elements cemented together. Negative doublet lenses are corrected for color and on-axis aberrations. TECHSPEC MgF2 Coated Negative Achromatic Lenses are used predominantly as Barlow lenses to extend focal lengths. These lenses are often combined with positive achromatic mirror systems and imaging lenses.
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