Main technical features
This brass and aluminum refractor telescope comes with 60mm aperture, 400mm focal length and a f/6.6 optical system. It is custom-constructed to ride on Hydrogen-alpha performance. It includes the precision RichView tuning system. The achromatic doublet lens employs antireflection coatings. A rear 90-degree 10mm blocking filter complements the primary Etalon filter. The telescope comes standard with a BF10 and at <0.7 Angstroms, while being available with an internal module reducing that to <0.5 Angstroms.
This high-end model comes with a Thermal Stability of 0.005Å/°C. It also ships with a Cemax eyepiece. The 25mm focal length provides a maximum magnification of 16X. You also get a 52-degree field of view. The 1.25-inch barrel handles most types of eyepieces. For eyeglass wearers, this unit includes a Cemax Eyepiece that features a 20mm eye relief while the fold-down rubber eyecup enables use of the telescope with or without eyewear.
The telescope comes with a helical focuser with focus collar. It also ships with a Sol Range solar viewfinder. Transportation and storage of the optical tube assembly (OTA) is always safe and easy with the included carrying case. The mounting ring enables effortless positioning of the OTA to the mount to eliminate obstruction effectively and also to ensure comfort. The clamshell mounting ring comes with a ¼ 20 mount for use with field/video/photo tripods or easy piggyback rigging. You can get a Vixen-style dovetail plate separately when using standard telescope mounts.
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The telescope comes standard at <0.7 Angstroms with a BF10. You can optimize the internal module to lower that to <0.5 Angstroms, if you prefer. Attached directly behind the Etalon is the exclusive RichView tuning system that enables you to adjust for imaging equipment such as Bino-viewers or Doppler-shifted light, for hassle-free focusing, even when using a Barlow or Observatory Control System (OCS). The extra aperture provides a clear view. This great-looking brass and black f/6.6 refractor with 400mm focal length and 60mm aperture optimizes the performance of the SolarMax 60 Hydrogen-Alpha solar filter, to reveal more than just sunspots. It also supports your exploration of granulation, flares, filaments and prominences. Exclusive multi-layer anti-reflection coatings are on the optical components’ air-to-glass surfaces to eliminate ghosting for observing something as brilliant as the sun. Your vision is protected along with your investment in this device.
The two-piece solar filter is geared through a full aperture Etalon mounted in the front of the objective lens, along with a 10mm blocking filter built into the diagonal. You get a thermally-stable assembly at 0.005Å per degree Centigrade, to effectively prevent drifting away from the H-Alpha line as the filter rises in heat during normal observing. You can get full disk views of the sun. The 1.25″ drawtube extends to allow coarse focusing. The Cemax eyepiece provides the exact magnification you need for your solar viewing.
Around the drawtube is the secondary helical focusing ring that can be used to achieve final fine focusing. You can use barlow lenses, as well as afocal imaging and visual observing lenses for focusing. You can also opt for larger field-stop diameters to reduce vignetting, which are noticeable with small filters that also hamper the field of view. You can attach the telescope to piggyback rigs and tripods using the supplied wide clamshell mounting ring. Or use with an equatorial, alt-azimuth or motorized telescope mount with a separately purchased Vixen-style dovetail plate.
According to one customer, the helical focuser can take some getting used to especially for those who are accustomed to working with a knob. There is a small amount of looseness that makes fine focusing a real art and not really an exact science, since different users have varying preferences on this specific aspect. You may have to do some trial and error to achieve optimal focusing every time.
Buy from Amazon.com for ($1179)