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Silver cylindrical telescope eyepiece with black rubber eyecup and 1.25 inch barrel

Tele Vue

Tele Vue 17.3mm Delos 72° 20mm Eye Relief 1.25" Eyepiece

SKU CH-D4CF-PTDJN

17.3 mm eyepiece with 72° apparent field, 20 mm eye relief and 1.25" barrel for sharp, comfortable telescope viewing

  • Sharp, high-contrast views from advanced Delos optical design
  • Immersive 72-degree apparent field captures expansive celestial scenes
  • Comfortable 20mm eye relief suits eyeglass wearers for long sessions
  • Fits standard 1.25-inch focusers on virtually any telescope
  • Adjustable locking eyeguard with soft rolldown cup blocks stray light

Ideal eyepiece for astronomy enthusiasts

The Tele Vue 17.3mm Delos eyepiece delivers a 72-degree apparent field and 20mm eye relief for immersive stargazing. Its 1.25" barrel fits a wide range of telescopes. The design controls astigmatism, field curvature and lateral color for sharp, neutral views.

Optical performance and viewing comfort

High-contrast optics provide full-field sharpness for both solar system and deep-space observation. An adjustable eyeguard with a soft rolldown eyecup blocks ambient light to improve contrast. The generous eye relief allows comfortable extended sessions for eyeglass wearers.

Upgrade from narrower or less corrected eyepieces

This model replaces eyepieces with smaller apparent fields or shorter eye relief that cause vignetting or edge distortion. The jump is worth it when you need flat-field sharpness across a wide view and the option to add Dioptrx astigmatism-correcting lenses.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $324.99
Pricier than about 74% of the 1,401 comparable items (median $93.99).

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 1.25" barrel and what step do people miss?

Slide the 1.25" barrel into the telescope focuser or diagonal and tighten the locking screw; the step often missed is adjusting and locking the eyeguard height so the 20 mm eye relief is actually reached.

What maintenance or replacement will the 17.3 mm Delos need later?

Only occasional cleaning of the exposed lens surfaces and the soft rolldown eyecup; the eyepiece has no consumable parts and the Dioptrx adapter remains optional.

What limit appears first during a long observing session with the 72° apparent field?

The practical limit is eye fatigue from holding the exact 20 mm eye relief position; the optics maintain full-field sharpness and contrast throughout the session.

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