Tele Vue 24mm Delos Eyepiece

The Tele Vue 24mm Delos eyepiece was officially introduced at NEAF 2025, expanding the company’s Delos series which originally debuted in 2011. The Delos line was developed as an eyeglass-friendly alternative to the Ethos series, offering a 72-degree apparent field of view with increased eye relief and compact size. Prior to this release, the Delos line covered focal lengths from 3.5mm to 17.3mm. The 24mm model represents the longest focal length in the series and the first to use a 2-inch barrel exclusively.

The 24mm Delos continues the original design objectives of the series. It prioritizes full-field sharpness, minimal distortion, and color neutrality across the entire view. The design uses Ethos-level performance as a benchmark, delivering optimized imaging with enhanced contrast. This is achieved through carefully selected glass types with matching multi-coatings, internal anti-reflection treatments, and a precision layout of lens elements. These measures reduce pupil aberrations while preserving edge clarity and limiting geometric distortion.

New Tele Vue 24mm Delos Eyepiece expands popular line

One of the major upgrades in the 24mm Delos is the extended eye relief. At 22mm, it offers two additional millimeters compared to earlier Delos eyepieces. This extra distance makes the eyepiece particularly well-suited for users who wear eyeglasses, allowing them to view the full field comfortably. It includes a locking, height-adjustable eye guard designed to aid in proper eye alignment with the telescope's exit pupil. The eye guard also serves to reduce contrast loss from stray light and helps prevent dew buildup on the eyelens during extended observing sessions.

The eyepiece is not designed for binoviewer use, likely due to its larger physical dimensions and 2-inch format. It is, however, parfocal with most 1.25-inch Tele Vue eyepieces when used with the company's HiHat 2-inch to 1.25-inch adapter. This allows for convenient switching between eyepieces with minimal focus adjustments.

The 24mm Delos weighs 522 grams and has a field stop diameter of 29.6mm, contributing to a wide true field of view that is particularly useful for observing large deep-sky objects. The eyepiece is compatible with Paracorr systems in position A, making it suitable for coma correction in fast Newtonian telescopes. It also supports DIOPTRX astigmatism correctors and works with Tele Vue’s smartphone adapter, the FoneMate, for digital imaging or assisted viewing.

Availability is expected by the end of 2025 through Tele Vue’s dealer network. Pricing information has not yet been released. The eyepiece was shown publicly for the first time at the Northeast Astronomy Forum in April 2025, continuing Tele Vue’s tradition of using NEAF as the launch platform for major optical products. The 24mm Delos reinforces the brand’s position in the premium eyepiece market, targeting visual observers who require long eye relief and high optical performance in a wide field format.

Tele Vue 24mm Delos Eyepiece specifications

• Product Code: EDL-24.0
• Focal Length: 24 mm
• Barrel Size: 2"
• Apparent Field of View: 72°
• Field Stop Diameter: 29.6 mm
• Eye Relief: 22 mm
• Weight: 522 grams
• Use with Binoviewer: No
• Paracorr Position: A
• DIOPTRX Compatible: Yes
• FoneMate Compatible: Yes

Introducing a 24mm, 2” model to the Delos eyepieces line

The 24mm Delos marks an important expansion in Tele Vue’s lineup, offering a unique combination of long focal length and high optical performance within a 2-inch format. Its introduction answers a gap in the Delos series, extending the same visual precision and comfort to wider field applications. With a 29.6mm field stop diameter and a 72-degree apparent field of view, it provides a generous true field ideal for scanning large deep-sky objects or wide star fields with excellent edge-to-edge sharpness.

Weighing in at 522 grams, the eyepiece maintains a solid, balanced build while avoiding the bulk often associated with other long focal length 2-inch designs. Despite its size, it remains parfocal with most Tele Vue 1.25-inch eyepieces when paired with the company’s HiHat adapter, offering a smooth transition between focal lengths during observing sessions. Its construction prioritizes user handling, with a locking adjustable eye guard that not only supports comfortable positioning but also shields the eyelens from dew and unwanted stray light.

Accessory compatibility enhances the eyepiece’s versatility. The 24mm Delos works with Tele Vue’s DIOPTRX astigmatism correctors, enabling observers with specific vision needs to fine-tune their experience. It also supports integration with the FoneMate smartphone adapter, opening up options for visual documentation or assisted viewing setups. Although it’s not suited for use with binoviewers, its compatibility with Paracorr in Position A makes it a strong match for fast Newtonian telescopes, helping correct for coma and preserve image quality across the entire field.

With a release date projected for late 2025 and pricing yet to be disclosed, the 24mm Delos will likely appeal to experienced observers looking for a high-performance, wide-field eyepiece that supports both visual comfort and optical excellence. By maintaining the core values of the Delos line, clarity, contrast, and ergonomic use, while extending its reach to longer focal lengths, Tele Vue has created a tool well-suited for deep-sky work and general-purpose observing alike.

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