Introduced at the 2007 Northeast Astronomy Forum, Tele Vue once again broadened the amateur astronomer's perspective on the universe with: 100° of pure Tele Vue quality. The field area of this new eyepiece is more than 50% larger than an 82° field. The Tele Vue Ethos 17mm is essentially multiple eyepieces, delivering the true field size of a longer focal length, narrower apparent field eyepiece with the benefits of higher power and darker sky background.
We invited NEAF attendees to take a look and see the universe the way we think it was meant to be experienced, with a field of view incredibly wide and sharp! We were very pleased indeed by the response and validation of our design goals.
The Tele Vue ETHOS 17mm is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 10mm above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area.
Tele Vue Ethos 17mm Specifications
| Focal Length |
17mm |
| Apparent Field | 100° |
| Eye Relief |
15mm |
| Effective Field Stop Diameter |
29.6mm |
| Barrel Size |
2" |
| Weight | 703g |
Related Links
•Eyepiece Distortion
Technical reference on rectilinear and angular magnification distortion.
•Majesty Factor
Compare eyepieces by quantifying contrast, power, and apparent field.