Baader Hyperion 68° 13mm Eyepiece - 1.25"/2"

68° Field with 7-Layer Phantom Group Coatings

The 68° apparent field provides an immersive, wide-screen window into the sky, making it easier to frame objects and observe their surrounding context. To ensure maximum light reaches your eye, every air-to-glass surface features Baader's 7-layer Phantom Group broadband coatings. This system is specifically tuned to be most effective around 520nm, the peak sensitivity of the dark-adapted human eye, resulting in reduced reflections and enhanced contrast.

Photographic Modularity with M43 & SP54 Threads

Beneath the removable rubber eyecup, the Hyperion 13mm hides a versatile imaging system. It incorporates two distinct threads for connecting cameras: an M43 thread for classic eyepiece projection with optional T-rings, and an SP54 thread for afocal photography where a camera with a non-removable lens is placed over the eyepiece. This modularity extends to its focal length; by using optional 14mm or 28mm Fine Tuning Rings, you can adjust the magnification without adding a Barlow lens, preserving the original optical quality.

Dual 1.25" and 2" Barrel System

The Hyperion 13mm offers universal compatibility with any telescope. The main 1.25" barrel fits the most common focuser size and includes threads for standard 1.25" filters. For telescopes with larger 2" focusers, the 1.25" barrel section simply unscrews, revealing an integrated 2" barrel. This provides a more stable and secure connection in 2" diagonals and focusers without requiring any separate adapters.

Hyperion 13mm vs. 21mm: Choosing Your Magnification

While both eyepieces share the same 68° field and modular features, their focal lengths are suited for different targets.

• Hyperion 21mm: This eyepiece delivers a wider true field of view and lower magnification. It excels at scanning rich star fields, locating objects, and framing large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).
• Hyperion 13mm: Your 13mm Hyperion provides higher magnification, making it the superior choice for resolving detail. Use it to break down the dense cores of globular clusters like the Hercules Cluster (M13), examine the structure of smaller galaxies, and observe planetary detail on nights of steady seeing.