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Bi-concave glass lenses are manufactured with both surfaces concave. These
lenses have negative focal lengths.
- These lenses diverge collimated incident light and form virtual images,
which are seen through the lens.
- They are often used to expand light or increase focal lengths in existing
systems.
- They are used in laser beam expanders, optical character readers, viewers,
and projection systems.
- Antireflection coatings can be ordered as an
option.
- We will provide precision grade bi-concave lenses
with tighter manufacturing tolerances.
- Minimum Order Quantity (MOQ) ranging from 100 to 1,000 units.
General Specifications:
| Parameter |
Value |
| Default unit |
mm |
| Material |
BK7 |
| Diameter tolerance |
+0, -0.1mm |
| Focal length tolerance |
+/-2% |
| Center thickness tolerance |
+/-0.2mm |
| Centration |
3 arc min |
| Surface quality |
60-40 |
| Flange width |
0.2-0.4mm |
| PN: |
DVS006-027
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| Description: |
Bi-concave lens BK7, standard grade, Dia=6, EFL=-27
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| Material: |
BK7
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| EFL: |
-27.5
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| Diameter: |
6
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| Index: |
1.5168
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| BFL: |
-28.15
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| Tc: |
2
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| Te: |
2.31
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| Radius1: |
-28.761
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| Radius2: |
28.7607282098198
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| Volume Price: |
$11.20 (MOQ Range Applies) Request Volume Quote |
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