Tele Vue 4.7mm Ethos-SX 1.25" with 110 Degree Apparent Field of View, with 2" Eye Adapter
Your card will only be charged once item ships.
Al Nagler eagerly pushed Ethos designer Paul Dellechiaie to extend the 3.7mm focal length to reach 110°, the same field size as the LEM Simulator optics Al designed years ago to train NASA astronauts for lunar landings.
The 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 Pl"ssl (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. A2" adapter is included.
|Barrel Size||1-1/4" / 2" Adapter (included)|
|Apparent Field of View||110 deg|
|Eye Relief||15mm (accepts DIOPTRX eyesight astigmatism corrector)|
|Field Stop||Effective Diameter: 8.94mm|
|Weight||1.30 lbs / 20.8 lbs|