Lessons learned from the tremendously successful Ethos project were applied to develop this long eye-relief 72° apparent field of view eyepiece line.
Concept: It was natural to take lessons learned from the tremendously successful Ethos project and apply it going forward. In the fall of 2008, Paul Dellechiaie was tasked to investigate a long eye-relief eyepiece design in the 70° AFOV range, retaining the key performance goals met with Ethos. My father named Paul's design, "Delos." Delos is a beautiful Greek island which happens to be the mythical birthplace of Apollo, god of light. More importantly the name was chosen to give recognition to Paul, principal designer of both Delos and Ethos. — David Nagler
Tele Vue is pleased to introduce the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical, mechanical, and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.
The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief, while controlling pupil aberrations, all without making the eyepiece too large. With Ethos performance standards as benchmarks, the Delos design achieves full field sharpness, virtually perfect f θ (theta) distortion mapping, and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.
Contrast is further enhanced with a new, continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in perceived contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect position. The eye-guard can also rotate for Dioptrx users.
- Wide, sharp 72º apparent field of view
- Comfortable 20mm eye relief
- Continuously adjustable height eyeguard with index marks
- 3.5mm-12mm Parfocal with all Tele Vue 1¼" eyepieces.
- Proprietary tuned full multi-coatings & high index glass
- Blackened lens edges & Anti-reflective threads
- Fold-down, rubber eyeguards & grip rings
- Threaded for either 1.25" or 2" filters depending on model
- Safety undercut in nosepiece barrel for extra locking security
- 100% full field visual inspection on Tele Vue's own flat-field test instrument guarantees the performance of every Tele Vue eyepiece
- Supplied with eyeguard and nosepiece cover
Eyepiece Field of View Simulator
Paracorr Type-2 Use
The 2" to 1¼" In-Travel Adapter makes 17.3mm and 14mm Delos models parfocal with most Tele Vue 1¼" eyepieces that use the Paracorr Type-2 reducing adapter.