Made of polished glass with ground edges.
Bi-convex lens: Magnifying or condensing lenses, with two outward curving symmetrical faces.
| Diameter | Focal length (+) | Cat. No. |
| 38mm | 50mm | 3305-01 |
|
| 100mm | 3305-02 |
|
| 150mm | 3305-04 |
|
| 200mm | 3305-05 |
|
| 300mm | 3305-07 |
|
| 500mm | 3305-08 |
|
| 1000mm | 3305-09 |
| 50mm | 50mm | 3305-21 |
|
| 100mm | 3305-22 |
|
| 150mm | 3305-24 |
|
| 200mm | 3305-25 |
|
| 250mm | 3305-26 |
|
| 300mm | 3305-27 |
|
| 500mm | 3305-28 |
|
| 1000mm | 3305-29 |
| 75mm | 175mm | 3305-41 |
|
| 200mm | 3305-45 |
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