How does the Baader Hyperion 17mm's dual barrel work?
The eyepiece is assembled with a 1.25" barrel that can be unthreaded and removed. Once this section is off, the main body of the eyepiece functions as a 2" barrel, allowing it to be inserted directly into a 2" focuser or diagonal. This provides a more stable connection and eliminates the need for a 1.25"-to-2" adapter.
What are the Phantom Group Coatings on the Hyperion 17mm eyepiece?
Baader Phantom Group Coating is a proprietary multi-layer anti-reflection coating applied to every air-to-glass surface. It is engineered to maximize light throughput and minimize reflections, leading to brighter images and higher contrast. The coatings are optimized for the wavelengths of light where the human eye is most sensitive at night.
Can I use the Baader Hyperion 17mm for astrophotography?
Yes, it's designed for it. The eyepiece has two built-in threads under the eyeguard for securely attaching cameras: an M43 thread for eyepiece projection with T-rings, and an SP54 thread for afocal photography with cameras that have fixed lenses. This makes it far more rigid than universal camera adapters.
How does the 17mm Hyperion perform on deep-sky objects like the Orion Nebula (M42) in an f/10 SCT?
In a typical 8" f/10 Schmidt-Cassegrain Telescope, the 17mm Hyperion provides about 119x magnification and a generous field of view that can frame the entire Orion Nebula (M42), including the Trapezium star cluster and its surrounding nebulosity. The high-contrast optics excel at revealing faint details and structure within the nebula's gas clouds.
What's the advantage of using fine-tuning rings with the Hyperion 17mm instead of a Barlow lens?
Fine-tuning rings change the eyepiece's focal length by altering the spacing of its internal optical elements, which does not introduce any new glass to the light path. A Barlow lens is a separate optical accessory that adds extra lenses. By avoiding additional lenses, the fine-tuning ring method maintains the original high optical quality of the Hyperion without potential degradation of sharpness or contrast.
Is the 68° field of the Hyperion 17mm good for viewing large open clusters like the Beehive Cluster (M44)?
Yes, the 68° apparent field is excellent for medium-to-large open clusters. In a telescope with a focal length around 1000mm, the 17mm Hyperion provides a true field of view of about 1.1 degrees, wide enough to easily contain the entirety of large clusters like the Beehive Cluster (M44) or the Pleiades (M45) within a single, well-corrected frame.
