Description
Pentax smc XW 5 Eyepiece Summary
This short powerful focal length eyepiece is particularly popular as it delivers more-or-less the maximum useful magnification from an 8-inch or 10-inch f/10 Schmidt-Cassegrain telescope.
Features
- High-refraction, low-dispersion Lanthanum glass.
- Pentax Super Multi-Coatings (SMC) on all air/glass surfaces.
- Edge-blackened optics and optimised baffles minimise internal reflections.
- Optically corrected for use with focal ratios as fast as f/4.
- 20mm eye-relief and twist-up rubber-rimmed eyecups – perfect for spectacle wearers.
- Chromed barrels threaded to accept filters.
- Weatherproof to JIS Class 4 standards.
Specifications
| Lens Structure: | 8 elements, 5 groups |
| Focal Length: | 5mm |
| Apparent Field of View: | 70 degrees |
| Eye Relief: | 20mm |
| Attachment Diameter: | 1.25″ (31.7mm) |
| Filter Diameter: | 28.6mm |
| Field Stop Diameter: | 6.2mm |
| Eyepiece Ring: | Helicoid type |
| Height & Width: | 5.0″ x 2.4″ |
| Weight: | 14.0 oz. (395g) |
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