Explore Scientific


Explore Scientific 15mm 52° 1.25-inch O.D. Argon-Purged Waterproof Eyepiece

 Solidly in the mid-magnification range for most amateur telescopes, the 15mm is a true workhorse for visual observers, and if you love deep sky observing the 15mm Explore Scientific 52° eyepiece is the right choice.

The 52°-series eyepiece features a standard 1.25" barrel to make it compatible with the most popular size drawtubes and accessories.

  • EMD anti-reflective multi-coatings ensure bright, high-contrast images with true color transmission across the entire wide field of view.
  • Great for viewing celestial objects by using averted vision
  • The fold-down rubber eyecup prevents stray light from leaking into the eye, further boosting contrast.
  • The eyepiece is internally sealed and purged with inert, dry argon gas, which maximizes the life of its internal coatings.
  • The eyepiece is tested by submerging it down to 1 meter of water for 30 minutes.
  • Fully multi-coated and edge-blackened to produce maximum contrast.
Focal length 3mm
Length 93mm
Width 43mm
Weight 206g; 7.3 oz.
Barrel Size/Type 1.25" (31.7mm) / Tapered barrel
Eye Relief 16.3mm
Field Stop Diameter 15.5mm
Coatings EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
Lens Elements/ Groups 6 Elements in 3 Groups
Filter Thread Standard 1.25" Filter Thread (M28.5 x 0.6)
Waterproof O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
Eyecup Removable Flip-Down Style Soft Silicone Rubber
Lens Caps Slide-on Top and Bottom
Materials Optical Glass; Aluminum; Steel; Silicone Rubber
Markings Laser Engraved: Focal Length; Series; Serial Number; Brand