Al Nagler eagerly pushed Ethos designer Paul Dellechiaie to extend the new 3.7mm focal length to reach 11°, the same field size as the LEM Simulator optics Al designed 45-years ago to train NASA astronauts for lunar landings.
Tele Vue 4.7mm Ethos SX Eyepiece - 1.25"/2"
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".
TeleVue 4.7mm Ethos SX Eyepiece Features
- The 4.7mm is a 1¼" format and is parfocal with the wide range of 1¼" Tele Vue eyepieces.
- 2" adapter included.
- Weight: 1.15 lbs / 1.3 lbs with 2" adapter/stand
- Eye relief: 15mm (accepts DIOPTRX eyesight astigmatism corrector)
- Effective field stop diameter: 8.94mm
- Focal length: 4.7mm
- Apparent field: 11°
- Additional Information
SKU TE-ETH-04.7 Manufacturer Tele Vue Optical Design Ethos Barrel Size 1.25"/2" Warranty Lifetime Warranty Eyepiece Field of View - Apparent 110º Eyepiece Focal Length 4.7mm Eyepiece Eye Relief 15mm Eyepiece Manufacturer Series Televue Ethos Eyepiece Weight 1 lb. 4.8 oz. Field Stop 8.94mm Special Feature None Comes with Dust Caps? Yes Comes with Eye Guard? Yes
- Included Items
- TeleVue 4.7mm Ethos SX Eyepiece - 1.25"/2"
- Dust Caps
- Questions & Answers
Product Questionsdoes the 2 inch adapter for the 4.7 mm Ethos have threads for 2 inch filters ? is it threaded for 2 inch filters ?Question by: john on Nov 27, 2016 4:47:00 PMTechnically yes, but you need to use an eyepiece barrel extender (https://www.optcorp.com/tele-vue-eyepiece-barrel-extender-2.html) to extend the 2" barrel past the 1.25" barrel. There is no way to thread on a 2" filter withut this additional part (or an equivalent long M48 threaded extension tube).Answer by: Chris Hendren on Nov 29, 2016 4:34:00 PM
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