Current Price: $110.00
Buy It Now Price: $110.00
Bids: 0

Being offered is a NEW Meade Doublet Lens this is fairly big at 110mm. This is a diffraction limited cemented doublet optimized for 1550nm. It was designed to be achromatic from 1520nm to 1620nm. The clear aperture is 105mm. 500mm Focal length. Anti-Reflection coating to 0.5% of maximum reflectance. It is mounted in threaded aluminum lens cell. This near-infrared (NIR) doublet was originally designed as a collecting optic in a laser communications system, it can also be used as a fiber beam expander. This lens has very good imaging quality at visible wavelengths and would make a real good objective lens for homemade telescope or it can be used as a large very nice magnifying glass. 

Comes in original box with documentation

Made By: Meade
Part No: DOUBLET ASSEMBLY (720-2200-0000) 

Prescription biconvex element:

SPHERICAL

RADIUS

 

SURF

QUAL

 

Surface irregularity

MAX

WEDGE

Center Thickness

R1 308.60mm

 

60-40

2 visible fringes

(0°01'38")

15.00 ±0.20mm

R2 233.00mm

60-40

2 visible fringes

MATERIAL: SCHOTT N-K5 OR GLASS CODE EQUIVALENT (522595)

REFRACTIVE INDEX: nd = 1.522 ± 0.001

STRIAE: NORMAL QUALITY

INHOMOGENEITY: NORMAL QUALITY

INCLUSIONS / BUBBLES: B0 ( 0.03 mm2 per 100 cm3 )

 

 

Prescription meniscus element:

SPHERICAL

RADIUS

 

SURF

QUAL

 

Surface irregularity

MAX

WEDGE

Center Thickness

R1 -233.00mm

 

60-40

2 visible fringes

(0°01'38")

5.50 ±0.20mm

R2 534.70mm

 

60-40

2 visible fringes

MATERIAL: SCHOTT SF11 OR GLASS CODE EQUIVALENT (785258)

REFRACTIVE INDEX: nd = 1.785 ± 0.002

STRIAE: NORMAL QUALITY

INHOMOGENEITY: NORMAL QUALITY

INCLUSIONS / BUBBLES: B0 ( 0.03 mm2 per 100 cm3 ).

Filed under: Eyepieces & Accessories