Focusrod®

FOCUSROD®
Gradient Index (GRIN) Rod Lens

The FOCUSROD’s refraction index radially decreases step by step, beginning in the optical axis’ middle.

Despite the fact of being a single lens, the imaging quality of FOCUSROD is extremely high.

Due to FOCUSROD’s plane end face, it is ideal for thin endoscopes.
FOCUSROD’s graded index evolves from the exchange of silver ions and alkali ions.

Benefits

  • wide viewing angle
  • small chromatic aberration
  • small diameter
  • RoHS compliant
  • Outside surface is flat. Makes it suitable for an objective lens for endoscopes with thinner diameter
Available sizes (custom made)  
Diameter Ø 0.15 ~ 0.80 mm
W.D. 0.04 ~ 50 mm
Angle 50 ~ 90°

 

 Typ 

FR-80 

FR-70 

FR-65 

Diameter 

0.350+0/-0.005 

0.350+0/-0.010 

0.350+0/-0.010 

Lenght 

0.732±0.050 

0.762±0.050 

0.780±0.050 

Resolution 

>400LP/mm (Mitte), >150LP/mm (Rand)

Magnification 

1:23 

1:20 

1:18 

Angle 

80±2° 

70±2° 

65±2° 

W.D. 

5.0 mm 

Field of curvature 

< 40μm 

< 30μm 

< 25μm 

Chromatic aberration 

< 15μm 

Core refractive index 

ca. 1.674 

ca. 1.665 

ca. 1.660 

Convergence parameter 

ca. 2.21 

ca. 2.11 

ca. 2.08

 

Creating the big picture.together.

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