Baader Hyperion eyepiece 21mm

The latest Baader Hyperion wide-angle eyepieces set a new benchmark in optical performance and versatility:

Featuring a 68° field of view, these eyepieces are optimized for the human eye, providing a comfortable viewing experience even with slight involuntary movements of the observer's head. This ensures that the entire field remains visible without strain.

Each eyepiece incorporates eight lens elements in five groups, delivering flawless sharpness across the entire viewing field and exceptional color fidelity up to the very edges.

These multifunctional eyepieces offer dual usage: with the 2" barrel, it functions as a wide-field, low magnification eyepiece; by adding the 1.25" negative achromat group, it achieves higher magnification. This adaptability makes them highly effective for both general and detailed astronomical observation.

They are designed to produce the lowest possible distortion and minimal astigmatism, utilizing high refractive index glass elements. Additionally, they boast the shortest field stop position among wide-field eyepieces, enhancing their performance in binocular viewing setups.

Comfort during use is paramount, with a design that prevents the common 'kidney-bean effect,' ensuring the image remains stable and clear, even with head movements. This feature makes them particularly user-friendly, even for beginners or in public observatories.

Another notable feature is their capability as projective lenses for photography. By replacing the eyecup with an M43-T2 adapter, these eyepieces become compatible with SLR and digital cameras, allowing for a wide range of photographic applications. Adapter rings facilitate connection to nearly any camera equipped with a front thread, and the inclusion of spacers lets you alter the focal length to suit different imaging needs. The design is also compatible with bino-viewers, and the fold-down eyecups provide sufficient eye relief for spectacle wearers.

Key Advantages:

• Superior craftsmanship ensures durability and precise optical alignment.
• Relaxed viewing experience with a large, clear field of view.
• Exceptional sharpness and color fidelity throughout the viewing area.
• Versatile dual barrel usage for varying magnification needs.
• Minimal distortion and astigmatism enhance image quality.
• Absence of the 'kidney bean' effect for a stable, consistent view.
• Baader Phantom Group coating™ features a sophisticated 7-layer anti-reflection treatment, significantly reducing residual reflections. This coating system is fine-tuned for each type of glass to maximize efficiency, particularly in the green spectral range around 520nm, where the human eye is most sensitive at night.

The coatings are nearly colorless, ensuring optimal light transmission and minimal interference from scattered light, which is crucial for night viewing. A strong green reflection when looking directly at a lens indicates a lesser coating, not associated with the Baader Phantom Group, which signifies a loss of light in the critical spectral range of 500-550nm.

Specifications:

Focal Length: 21 mm

Apparent Field of View: 68°

Eye Relief: 20 mm

Number of Lenses: 8

Number of Groups: 5

Telescope Connection: 2"

Optical System Coating: Multiple

Special Features:

Optional camera adapter: Yes

Adjustable eyecup: Folding

Filter thread: Yes

Inert gas charge: No

General:

Series: Hyperion

Type: Eyepiece

Build Type: SWA (Super Wide Angle)