Explore Scientific 52° Series 1.25" 30mm Waterproof Eyepiece

The 52° Series 30mm is the longest 1.25" focal length in the 52° Series, delivering wide, bright views of extended deep-sky objects. It has argon-purged waterproof construction and EMD coatings.

Key Features

• Argon-purged waterproof housing, sealed against moisture and fog. O-ring seals keep dirt, fungus and cleaning fluid from getting between the lenses.
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces. The patented coating gives high contrast and suppresses reflections and ghosting.
• 4-element, 2-group optical design with edge-blackened elements to control internal reflections
• Fold-down silicone rubber eyecup with comfortable eye relief for relaxed viewing, including with eyeglasses. Its 19.9 mm of eye relief is the distance at which your eye takes in the whole field.
• 1.25" barrel delivers wide fields without requiring a 2" focuser. It is 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

• Deep-sky observers who want a wide view through a 1.25" focuser for large nebulae
• Telescope owners without 2" focusers who still want low-power, wide-field capability
• Finding objects. The wide true field makes objects easier to locate.

Accessories & Compatibility

• ED80 (480 mm, f/6). In the Explore Scientific ED80, through the 1.25" adapter of its 2" diagonal, the 30mm gives 16x, a 5.0 mm exit pupil and a 3.2° true field.
• FirstLight 80 (640 mm, f/8). In the Explore FirstLight 80mm Go-To Tracker Combo, in its 1.25" 90° diagonal, it gives 21x, a 3.8 mm exit pupil and a 2.4° true field.