Explore Scientific

EPWP5220-01

Explore Scientific 20mm 52° 1.25-inch O.D. Argon-Purged Waterproof Eyepiece

 

Often considered the perfect mid-range focal length for most amateur telescopes, the 20mm Explore Scientific 52° Seriesare excellent flat-field multi-element oculars that can transform your visual astronomy experience.

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

Features:
  • 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.
Specs
Focal length 20mm
Length 71mm
Width 43mm
Weight 181.4g; 6.4 oz.
Barrel Size/Type 1.25" O.D. / Double Taper
Eye Relief 15mm
Field Stop Diameter 18.2mm
Coatings EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
Lens Elements/ Groups 5 Elements in 3 Groups; Edge Blackened
Filter Thread Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
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