The launch of Sharpstar SCA260, a fast-focal-ratio aspherical Cassegrain astrograph, fills up the existing service gap in domestic market. SCA260 is designed with an aspherical mirror which entails much more sophisticated research and development. The process of producing, manufacturing and testing is more complicated compared with that of an ordinary reflective mirror. The telescope is wrapped with durable carbon fiber material, artistically enhancing its appearance while sharply decreasing its weight. Both the primary and secondary mirrors wear enhanced aluminum coatings, which ensure they can achieve a high reflectivity of more than 95%. The new-added adjustable bar on the secondary mirror makes the reflective mirror horizontally move. The 3" dedicated focuser with heavy-duty design has an extraordinary load capacity, and can be smoothly adjusted. Both primary and secondary mirrors wear enhanced aluminum coating, thus keeping a reflective rate at more than 96%. The one-piece X-shaped strut of the secondary mirror keeps a solid and unbreakable structure. 2.5" rack-and-pinion focuser has a stronger load capacity and can be smoothly adjusted. The delicately pierced handle bar is completely made from CNC-manufactured aluminum, which can be used as a base for the attachment of other accessories. The new design of the telescope handle can aesthetically and mechanically cater to the demands of enthusiasts. A 3" corrector, featuring three-element lens structure, is laid in the optical path, enabling the whole optical system to better achieve full-frame imaging and control the vignette. The two-section thread design of the focuser prepares the telescope with popular M54×0.75 and M48×0.75 thread for most stock imaging devices and make sure the item in the objective lens can be perfectly projected onto the focal plane. Specifications Aperture 260mm Focal length of primary mirror 1300mm Focal ratio of primary mirror f/5.0 Primary mirror type Aspherical reflective mirror Primary mirror material PZ33 (similar to Pyrex glass) Corrector three-element air-spaced refractive lenses Minor axis of secondary mirror 120mm Secondary mirror type Spherical reflective mirror Image circle 80mm Main tube material High-end carbon fiber Main tube outer diameter 280.5mm Main tube length 712mm Net weight 15kg Resolution 0.46 arc second Focuser 3.2" Limiting visual magnitude 13.8 Back focus 75mm (starting from the base of the M48 thread on the housing)
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