Sharpstar SCA310 310 mm f/3.8 Aspherical Cassegrain Astrograph

Sharpstar SCA310 Aspherical Cassegrain Astrograph

With 310 mm aperture and a fast f/3.8 focal ratio, the SCA310 captures light with exceptional efficiency. This allows for significantly shorter exposure times and enhanced productivity in deep?sky astrophotography, revealing fine details and vivid colors even in faint nebulae.

Optical design
The SCA310 is a Cassegrain reflector whose primary mirror features a high-precision parabolic design. This aspheric mirror demands exceptional grinding and testing techniques to effectively eliminate spherical aberration, ensuring sharp, round star points.
Its matching spherical secondary mirror is made from fused silica glass, offering outstanding thermal stability. Achieve long focal length optical path folding within a compact lens tube - delivering both high performance and excellent portability.
The primary and secondary mirrors are coated with enhanced aluminum, ensuring a reflectivity of over 95%, fully boosting the efficiency of light utilization.

Integrated corrector
A 3-inch, triplet corrector is integrated at the rear of the tube, including 1 piece of ED glass, which effectively corrects field curvature and coma to deliver sharp, round stars from the center to the edges of the frame.
The SCA310 is specially optimized for medium format and fully covers the full-frame sensors, providing nearly 100% illumination and a flat image field even when shooting with full-frame sensor cameras.
The optical design of the SCA310 has been carefully optimized. It does not require additional calculation of back focus when shooting, enabling quick and effortless focusing which greatly simplifies the imaging process.

High-quality materials
The tube uses a lightweight and robust carbon fiber material. This not only effectively reduces the overall weight but also possesses excellent structural stability and temperature adaptability, preventing focus shift caused by thermal expansion and contraction, ensuring consistent imaging performance.
The top is equipped with a hollow handle for easy handling; the multi-hole slotted design facilitates the installation of various expansion accessories. The bottom is equipped with a 405 mm long Losmandy-style dovetail plate, compatible with mainstream equatorial mounts. Constructed using full CNC processing, the thickened and widened design ensures stable and reliable installation.

Focuser
The 3.5-inch high-rigidity rack-and-pinion focuser has an upgraded focusing travel of 28 mm, providing a greater focusing range. The dual-speed adjustment knob supports 1:10 fine focusing. The load capacity is further enhanced; even when loaded with multiple accessories, it maintains stable and smooth operation, eliminating slippage.
The focuser is equipped with a front-mounted 360° rotator, effectively preventing cable wrap during use. The rear features multiple threaded adapters (M68/M54/M48), ensuring seamless compatibility with a wide range of mainstream imaging equipment for precise and effortless focusing. The M48 adapter includes a built-in 2-inch filter thread, allowing for direct filter attachment during shooting.

The SCA310 also integrates three efficient cooling fans at the rear.

Safety informations: PDF Download