What makes the Baader Hyperion 21mm eyepiece different from a standard Plössl?
The Baader Hyperion 21mm offers several key advantages over a typical Plössl. Its 68° apparent field of view is significantly wider, providing a more immersive experience. It also features a native dual 1.25"/2" barrel for universal compatibility and integrated M43 and SP54 threads for secure camera attachment, making it a complete visual and photographic system.
How do I use the Baader Hyperion 21mm for astrophotography?
Simply remove the rubber eyecup to access the eyepiece's built-in camera threads. For cameras with interchangeable lenses (like DSLRs), use the M43 thread with a corresponding T-adapter for eyepiece projection. For cameras with fixed lenses, use the larger SP54 thread with the appropriate step rings for afocal imaging.
Can I change the 21mm focal length of the Baader Hyperion eyepiece?
Yes, the focal length is modifiable. The Hyperion eyepiece is a modular system that allows you to change its effective focal length by adding optional Baader Fine Tuning Rings between the main lens groups. This allows you to achieve multiple magnifications from a single eyepiece without the extra glass of a Barlow lens.
What are Baader Phantom Group Coatings on the Hyperion 21mm eyepiece?
Baader Phantom Group Coating is a proprietary broadband multi-coating applied to every air-to-glass surface. It is engineered to maximize light transmission and minimize reflections, with a special focus on the green part of the spectrum where the dark-adapted human eye is most sensitive. This results in brighter, higher-contrast views with minimal ghosting.
How will the Baader Hyperion 21mm perform for viewing the Andromeda Galaxy (M31) in an 8" f/10 SCT?
In a typical 8" SCT with a 2000mm focal length, the Hyperion 21mm will provide about 95x magnification. This is an excellent power for framing the bright core of the Andromeda Galaxy (M31), while the 68° field of view is wide enough to reveal its expansive dust lanes and hint at its full scale against the background sky.
Is the Baader Hyperion 21mm a good choice for observing open clusters like the Pleiades (M45) with a fast refractor?
Absolutely. The 21mm focal length provides the low-to-medium power needed to frame large open clusters like the Pleiades (M45) or the Beehive Cluster (M44) in their entirety. The 68° apparent field makes the experience feel like you are floating through the starfield, a perfect combination for rich-field viewing.
