Starizona Hyperion 12 inch astrograph

Telescopes can suffer from a variety of aberrations which are inherent in different optical designs. There are six primary aberrations to worry about: spherical aberration, distortion, coma, astigmatism, field curvature and chromatic aberration.

All telescopes are corrected for spherical aberration, and distortion is not a problem over the relatively narrow fields produced by telescopes. Coma causes stars to take on an asymmetric comet-like shape off axis. Coma is inherent in Newtonians, classical Cassegrains, and most Schmidt- Cassegrain telescopes. By using an aspheric mirror, some SCTs eliminate coma. The Ritchey-Chrétien deisgn uses two hyperbolic mirrors to eliminate coma. But such designs still suffer from astigmatism and field curvature, causing enlarged star images over a large field.

The Hyperion telescope does not suffer from coma, astigmatism or field curvature. By using an afocal (zero-power) corrector lens system, it can correct for all these aberrations without inducing chromatic (color) aberration. The design uses a parabolic primary mirror and spherical secondary mirror. The corrector lens consists of two elements located in the primary baffle tube. The Hyperion truly delivers the best image quality

• Flat-field, Harmer-Wynne optical design
• Diffraction-limited image circle 70mm (1.6°) in diameter
• RMS spot size less than 9 microns over 84mm (1.9°) diameter image circle
• No chromatic aberration over 350nm-1100nm range
• Low thermal expansion carbon-fiber optical tube
• Starlight Instruments 3.5" Feathertouch Focuser
• MicroTouch temperature-compensating autofocuser
• High-precision instrument rotator
• Integrated telescope control panel with digital readout
• Wireless control of all electronic telescope functions
• All electronic features ASCOM compatible
• CNC machined 6061 aluminum construction
• Two Losmandy-style dovetail plates
• Two rear cell cooling fans for rapid thermal stabilization
• Primary and secondary mirror heaters for dew prevention
• Made in USA

Specification:

SPECIFICATIONS

• Aperture: 12.5" (320mm)
• Focal Ratio: f/8
• Focal Length: 2540mm
• Secondary Mirror Diameter: 5.5"
• Overall Length: 39 inches (45 inches with focuser)
• Overall Diameter: 15.5 inches
• Total Weight: 60 lbs.

Extra info: