| Brand and Model: | Williams optics SWAN 40mm |
| Price ($USD): | 120$ |
| Type: | Misc Wide Angle |
| Focal Length: | 40 mm |
| Barrel Size: | 2 |
| Apparent FOV: | 72.0 degrees |
| Field Stop Dia.: | 0.0 mm |
| Eye Relief: | 28 mm |
| Elements: | 5 |
| Weight (lbs): | 1.25 |
| Description: | The Swan eyepieces are super wide angle designs with 72° apparent field of view. They use simple but sophisticated five-lens optical systems for generally higher contrast than the more complicated optical designs used in some other super wide angle eyepieces that use up to eight lenses. |
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