Baader Hyperion 17mm 1.25" eyepiece

The PHANTOM-GROUP Multi-Coatings are designed to maximize light transmission and minimize internal reflections, leading to brighter, sharper images with better contrast compared to standard coatings.

Yes, you can achieve variable focal lengths by using Baader's optional Fine Tuning Rings, which are sold separately.

Yes, the eyepiece features a design that incorporates both a 1.25" (31.7mm) and a 2" (50.8mm) barrel for compatibility with various telescope focusers.

While primarily designed for visual observation, the Hyperion eyepiece may be used for basic astrophotography, especially with its 2" barrel option. However, dedicated astro-imaging eyepieces or cameras often yield better results.

Gently brush off loose dust with a lens brush or air blower. For smudges, use a lint-free optical cloth lightly dampened with a photographic lens cleaning solution. Never spray liquid directly onto the lens.

The apparent field of view for this eyepiece is 68 degrees.

The 17mm focal length with a 68-degree field of view is excellent for observing medium-to-large deep-sky objects such as nebulae, star clusters, and galaxies, as well as wide star fields.

Ensure the eyepiece is fully inserted into the focuser and that the telescope's dust cap has been removed. Check that the aperture stop or diaphragm within the focuser is not blocking too much light.

This can be inherent to wide-field eyepieces. Try reducing magnification slightly or testing with an optional Fine Tuning Ring to see if it improves. Ensure your telescope's optics are well-collimated.

Verify which barrel size (1.25" or 2") your focuser accepts and ensure you are attempting to insert the correct corresponding barrel. Check for obstructions within the focuser.

Your telescope may not have enough inward focuser travel for this eyepiece. Try removing any Barlow or extension tubes. Alternatively, if your focuser has outward travel, you may need an extension tube.