Tele Vue Delos 72 Eyepieces
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Tele Vue Delos 72 Eyepieces

  (1 Review)
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About this product

Model:  tv_ep_delos_10mm
Part Number:  EDL-10.0

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 them 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, the god of light. More importantly, the name was chosen to recognise Paul, the principal designer of both Delos and Ethos. — David Nagler

Introducing Delos

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 the freedom to increase eye-relief while controlling pupil aberrations 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 colour neutrality. Image fidelity is maximised by utilising glass-matched multi-coatings 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 relatively large 35mm diameter, preventing stray light from reflecting off the first surface and extraneous light from entering your eye increases 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 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.


Model 3.5mm 4.5mm 6mm 8mm 10mm 12mm 14mm 17.3mm
Focal Length (mm) 3.5 4.5 6 8 10 12 14 17.3
Barrel Size (in.) 1¼" 1¼" 1¼" 1¼" 1¼" 1¼" 1¼" 1¼"
Apparent Field of View (deg.) 72 72 72 72 72 72 72 72
Eye Relief (mm) 20 20 20 20 20 20 20 20
Weight (lb / oz) 1.10 / 17.6 1.10 / 17.6 1.00 / 16.0 1.00 / 16.0 0.90 / 14.4 0.90 / 14.4 0.90 / 14.4 0.90 / 14.4
Field Stop (mm) 4.4 5.6 7.6 9.9 12.7 15 17.3 21.2

Customer reviews

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Excellent improvement to eyepiece range
27 December 2022  | 

I had purchased the 6mm Delos some time ago and found it incredibly comfortable to use. I currently wear contact lenses so eye relief is not an issue, but may have to resort to wearing glasses in the future. The 10mm is equally impressive, so far used with a Meade 10" f10 on NEQ6. Mars was a joy to behold, crisp and detailed.


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