Explore Scientific 92° ED Series 14mm Waterproof Eyepiece

The 92° Apparent Field

You may be startled at the wide expanse of inky black sky the first time you look through a 92° Series eyepiece, and may even forget there is an eyepiece between you and the universe. The 14mm is a powerful combination of moderate magnification and an ultra wide field, well suited to targets from planetary detail to deep sky exploration.

The wide field lets you take in more of the sky at once while keeping focus on your target.

9-Element Design with ED Glass

The 14mm uses 9 elements in 6 groups, including extra-low dispersion (ED) glass. ED glass offers reduced color fringing, sharper high-contrast views and better performance at high magnification.

ED glass has a high Abbe number, meaning it has a reduced tendency to separate white light into its component colors. This keeps the colors focused together, so subtle differences in star color or planetary tones are closer to reality.

• ED Glass Element: Reduces chromatic aberration for sharper, higher-contrast views and more accurate color representation.
• Fully Multi-Coated Optics: The optics are fully multi-coated, with durable coatings.
• Edge-Blackened Lenses: Lens edges are blackened for maximum contrast.

18mm Eye Relief for Extended Viewing Comfort

The 14mm has 18mm of eye relief. The 92° ED Series offers long eye relief, serving up great views with reduced eyestrain, and comfortable viewing during extended sessions.

Waterproof, Argon-Purged 2-Inch Barrel Construction

Each eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, with a waterproof, fog-proof housing.

The tapered 2" barrel adds extra security. The eyepiece measures 141mm long and 60mm wide; the catalog gives no weight.

Calculating Magnification and True Field with the 14mm Eyepiece

The 14mm focal length determines the magnification you will achieve with your specific telescope. To calculate it, simply divide your telescope's focal length by the eyepiece's focal length. For example, in a telescope with a 2000mm focal length, this eyepiece provides 143x (2000mm / 14mm).

The true field of view (TFoV), how much actual sky the eyepiece shows, depends on the 20.6mm field stop diameter. You can approximate the TFoV in degrees by using the formula: (Field Stop / Telescope Focal Length) * 57.3. In that same 2000mm focal length telescope, the TFoV would be approximately 0.59° ((20.6 / 2000) * 57.3).