12.5mm Dia x -75mm Negative Doublet Lens FL MgF2 Coated

12.5mm Dia x -75mm Negative Doublet Lens FL MgF₂ Coated

Diameter (mm):

12.50 +0.0/-0.025

Effective Focal Length EFL (mm):

-75.00

Focal Length Tolerance (%):

±2

Back Focal Length BFL (mm):

-77.47

Focal Length Specification Wavelength (nm):

587.6

Clear Aperture CA (mm):

11.50

Centering (arcmin):

Center Thickness CT 1 (mm):

2.50

Center Thickness CT 2 (mm):

3.00

Center Thickness Tolerance (mm):

±0.2

Radius R₁ (mm):

-46.07

Radius R₂ (mm):

36.65

Radius R₃ (mm):

108.00

Edge Thickness ET (mm):

6.05

N-BK7 / N-SF5

Surface Quality:

40-20

f/#:

6.00

Numerical Aperture NA:

0.08

Coating:

MgF₂ (400-700nm)

Coating Specification:

R_avg ≤1.75% @ 400 - 700nm

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Bevel:

Protective bevel as needed

Type:

Negative Achromatic Lens

Wavelength Range (nm):

400 - 700

Regulatory Compliance

RoHS 2015:

Compliant

Reach 209:

Compliant

產品系列說明

氟化鎂(MgF₂)鍍膜
用於延伸焦距
也提供寬頻抗反射鍍膜負消色差透鏡

TECHSPEC® MgF₂ 鍍膜負消色差透鏡由兩個黏合在一起的光學元件組成。負膠合雙透鏡針對色彩及軸上像差進行校正。TECHSPEC MgF₂ 鍍膜負消色差透鏡主要作為巴洛鏡頭，用於延伸焦距。這類透鏡通常搭配使用正消色差反射鏡系統及成像鏡頭。