Explore Scientific 68° 34mm Waterproof Eyepiece - 2"

A 68° Immersive Field in a 34mm Focal Length

This eyepiece is engineered to produce a wide, flat, and high-contrast window into the cosmos. The 34mm focal length yields very low magnification, making it an ideal "finder" eyepiece for locating faint targets and an exceptional instrument for observing large-scale objects. The 68° apparent field of view is wide enough to frame the entirety of the Andromeda Galaxy (M31) or the Veil Nebula complex in most long-focal-length telescopes.

Argon-Purged: Waterproof to 1 Meter for 30 Minutes

Dew and humidity are constant challenges in astronomy, but this eyepiece is built to withstand them. The optical housing is purged of all air and filled with inert Argon gas before being sealed. This process makes the eyepiece impervious to internal fogging, fungus growth, and contaminants, and it has been factory-tested by submersion in 1 meter of water for 30 minutes. The dry, sealed environment means you can move from a warm house to a cold field without fear of internal condensation clouding your view.

Parfocal Design and Long Eye Relief for Observer Comfort

Practicality is central to the 68° Series design. This 34mm model is parfocal with its siblings, meaning you can swap between different focal lengths in the series with little to no refocusing required. It also features long eye relief and a soft, foldable silicone eyecup, providing comfortable views for all observers, including those who must wear eyeglasses to correct for astigmatism.

ES 68° 34mm vs. ES 82° 30mm: Field of View vs. Eye Relief

When choosing a low-power eyepiece, a common comparison is between the 68° series and the wider 82° series. While the 82° eyepieces offer a more expansive "spacewalk" apparent field, the 68° series provides a critical advantage in observer comfort.

• Eye Relief: The 68° 34mm eyepiece has significantly longer eye relief, making it a superior choice for observers who wear glasses.
• True Field: Despite the smaller apparent field, the longer 34mm focal length means the true field of view is very comparable to a 30mm 82° eyepiece. You are not sacrificing much sky.
• Immersion vs. Comfort: The choice comes down to priorities. The 82° series offers maximum immersion, while the 68° series provides a more relaxed, comfortable view without giving up the wide-field experience.