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| Model | Risley Rotary Prism |
|---|---|
| Prism Range | -20D ~ +20D |
| Lens Diameter | 28mm |
Prism ranges: +/- 20 PD with handle.
With red Maddox filter.
The prism power is controlled with a convenient knurled rotating knob.
Accurately calibrated dial shows prism diopter selected.
