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下載產品資料
Diameter (mm):
20.00 +0.0/-0.025
Effective Focal Length EFL (mm):
25.00
Focal Length Tolerance (%):
±1
Back Focal Length BFL (mm):
18.71
Focal Length Specification Wavelength (nm):
587.6
Clear Aperture CA (mm):
19.00
Centering (arcmin):
<1
Center Thickness CT (mm):
12.00 ±0.20
Center Thickness CT 1 (mm):
9.50 ±0.10
Center Thickness CT 2 (mm):
2.50 ±0.10
Radius R1 (mm):
18.03
Radius R2 (mm):
-13.27
Radius R3 (mm):
-55.46
Edge Thickness ET (mm):
8.06
Substrate:
Many glass manufacturers offer the same material characteristics under different trade names. Learn More
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