Explore Scientific 52° Series 1.25" 4.5mm Waterproof Eyepiece

The 52° Series 4.5mm delivers detailed planetary views when the seeing is favorable. Argon-purged waterproof construction means the eyepiece is sealed against moisture and fog-proof inside.

Key Features

• Argon-purged waterproof housing, sealed and fog-proof. It is O-ring sealed and tested under 1 meter of water for 30 minutes.
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces maximize contrast. The patented coating also suppresses reflections and ghosting.
• 6-element, 3-group optical design with edge-blackened elements to suppress scattered light
• Fold-down silicone rubber eyecup provides comfortable eye relief, with or without eyeglasses. Its 15 mm of eye relief is the distance at which your eye takes in the whole field.
• 1.25" barrel. Stainless steel, tapered for a more secure hold.
• Parfocal series. All 52° Series eyepieces focus at about the same point, so swaps need little refocusing.

Ideal For

• Planetary observers who want detailed views
• Lunar observers exploring the Moon at high power
• Double-star observers who want high magnification
• Bright, compact deep-sky objects such as planetary nebulae and globular clusters

Accessories & Compatibility

• ED80 (480 mm, f/6). In the Explore Scientific ED80, through the 1.25" adapter of its 2" diagonal, the 4.5mm gives 107x, a 0.75 mm exit pupil and a 0.49° true field.
• 6" Tabletop Dobsonian (760 mm, f/5). In the 6" f/5 Tabletop Dobsonian, through the 1.25" adapter of its 2" focuser, it gives 169x, a 0.9 mm exit pupil and a 0.31° true field.
• Filters. The barrel takes standard 1.25" thread-in filters, such as the Neutral Density Filter 1.25" ND 0.9 for the Moon.