กล้องดูดาว Sharpstar SCA260 v.2 260mm f/5 Super Ashperical Cassegrain Astrograph with Integrated Field Flattener & Carbon Fiber Tube Ver2.1 (ฟอกัสเซอร์หมุนได้)

The Sharpstar SCA260 is a fast focal ratio Cassegrain astrograph for serious astrophotographers that delivers superb images at an affordable price. With an aspherical f/5 primary mirror of 260mm aperture, the SCA260 includes an integrated three-element air-spaced corrector that produces a huge 80mm image circle. With a full-frame camera, the 1300mm focal length of the SCA260 delivers a big 1.5^o x 1.0^o field of view that’s flat and well corrected right to the edge.

Note: Version 2.1 improves on the v2.0 by having the rotator between the telescope and focuser (therefore focuser can also be rotated). Pictures below mostly shows v2.0 but new orders will receive the latest 2.1 version.

The tube of the SCA260 is made from an attractive durable carbon fiber material to keep the overall weight low and to enhance thermal performance. Both the primary and secondary mirrors feature enhanced aluminum coatings to ensure a high reflectivity of more than 95%. The 3" corrector features a three-element lens structure that enables the entire optical system to better achieve full-frame imaging and control vignetting. Cooling fans are included to rapidly stabilize the temperature of the optics and minimize tube currents (power supply for the fans is sold separately).

The 3" dedicated two-speed heavy-duty focuser with heavy-duty design can be smoothly adjusted. The scope includes mounting rings, Losmandy-style mounting plate, and carrying handle/accessory plate all made from CNC-manufactured aluminum. The two-section thread design of the focuser incorporates M54×0.75 and M48×0.75 male threads to interface with most popular astronomy cameras.

(Camera and other accessories shown in product photos are representative only and are not included).

Specifications:

• Primary mirror aperture: 260mm
• Focal length/focal ratio: 1300mm/f5
• Primary mirror type: Aspherical reflective mirror
• Primary mirror material: PZ33 (same as pyrex glass)
• Corrector rear group combination: Three element air-spaced lens structure
• Minor axis diameter of the secondary mirror: 120mm
• Secondary mirror holder diameter: 150mm
• Secondary mirror type: Spherical
• Image circle: 80mm
• Tube material: Carbon fiber
• Outer diameter of tube: 280.5mm
• Tube length: 712mm
• Tube weight: 15.2kg / 33lb-8oz with both dovetails
• Resolution: 0.46"
• Focuser: 3.2 inch
• Visual limiting magnitude: 13.8
• Available back focus: 75mm (calculated from the base of the M48 male thread)
• Focuser travel: 40mm
• Losmandy D-rail on the bottom / flat plate mounted atop the tube for attachement of guidescopes or other accessories
• Cooling fans: 3 integrated units. Requires external 12V DC power supply (not included)
• Requires 2x LR44 batteries (not included) for temperature display

Schematics

Astrophotos: