Negative Meniscus

Negative Meniscus Lenses

Optola offers wide range of high quality negative meniscus lenses.

Custom design negative meniscus lenses are available upon request.

      NML            –             254          –         950           –          459          –         BK7   

         ↓                                 ↓                          ↓                            ↓                          ↓

Product Code    Diameter  25.4mm    R1 = 95mm       R2 = -45.9mm         Material

Part Number

Dia(mm)

Tc(mm)

Te(mm)

R1(mm)

R2(mm)

EFL(mm)

Material

NML-254-R950-R459-BK7

25.4

2.86

3.8

95.0

-45.9

-175.0

BK7

NML-254-R1000-R431-BK7

25.4

3.73

4.77

100

-43.11

-150.0

BK7

NML-254-R900-R373-BK7

25.4

2.02

3.3

100

-38.973

-125.0

BK7

NML-254-R900-R326-BK7

25.4

2.32

3.92

100

-33.8

-100

BK7

Note

     Other sizes and focal length are available upon request. Also the lens ring mounts are available upon request.NML

Material

BK7 or UV fused silica

Focal  Length Tolerance

±1% @589nm

Design Wavelength

589nm

Centration

≤3′

Diameter  Tolerance

+0/-0.1mm

Clear Aperture

≥ central 90%  of  diameter

Center Thickness  Tolerance

±0.1mm

Surface Quality

20/10(UVFS)/ 40/20(BK7)

Surface Accuracy

≤ 1.5λ power,λ/2 irregularity(UVFS)

≤ 1.5λ power,λ/4 irregularity(BK7)

Chamfers

0-0.8mm face width×45°±15°

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