Al Nagler eagerly pushed Ethos designer Paul Dellechiaie to extend the new 3.7mm focal length to reach 110°, the same field size as the LEM Simulator optics Al designed 45-years ago to train NASA astronauts for lunar landings.
The new 4.7mm Ethos-SX, like its 3.7mm progenitor, is designed and crafted to combine its exceedingly wide field of view with all the contrast, color-rendition, distortion correction and center-to-edge sharpness needed to achieve that natural view.
Compared to a lower power eyepiece with the equivalent TFOV (similar field stop) such as an 11mm Plössl (9.1mm field stop), the greater power – for higher resolution, and smaller exit pupil (for a darker background to enhance contrast) reveals a deep sky experience \\”even better than you imagined\\”.
The 4.7mm is a 1¼\\” format and is parfocal with the wide range of 1¼\\” Tele Vue eyepieces. 2\\” adapter included.
- Focal Length: 4.7 mm
- Barrel Size: 2\\” & 1¼\\”
- Apparent Field of View: 110 deg.
- Eye Relief: 15 mm
- Weight: 1.30 lbs. / 20.8 oz.
- Field Stop: 8.94 mm
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