The Sharpstar SCA260 Version 2 is an Aspherical Cassegrain astrograph with a fast focal ratio of f/5 and a focal length of 1300mm. The new version 2 comes with an upgraded focuser and rotator, re-designed cooling system, handles on the rear of the tube and a 1.25" collimating eyepiece.

This telescope features a 260mm aspherical primary mirror made of PZ33 borosilicate glass with a similar low expansion coefficient of the Pyrex. The enhanced aluminium mirror coating ensures a reflectivity of over 95%. The secondary mirror has a new lever adjustment function that can be moved in a horizontal position.

The optical path includes a triplet air-spaced 3" field flattener optimized for medium format photography with minimal vignetting. The heavy duty rack & pinion 3.2" focuser ensures smooth operation without slipping and the high capacity for accessories. The focuser is compatible with the ZWO EAF electronic focuser bracket.

The two M54×0.75 threads and M48×0.75 threads at the rear of the focuser can meet different needs, are convenient to connect to most commercially available imaging-terminal and achieve perfect focus.

The optical tube is made of carbon fiber with CNC-machined aluminium parts for enhanced structural rigidity and durability, and features three cooling fans at the rear.

CCDInspector plot showing the curvature of the SCA260.

Specifications

Optical design	Aspherical Cassegrain reflector
Primary mirror diameter	260 mm
Focal length	1300 mm
Focal ratio	f/5
Secondary mirror	Spherical, 120 mm (minor axis)
Corrector rear group	Triplet air-spaced
Image circle	80 mm
Focuser	Rack & pinion, dual speed (10:1) 3.2" diameter
Resolving power	0.46 arc second
Stellar limiting magnitude	13.8
Camera connection	M114 x 1 female, M54 x 0.75 male, M48 x 0.75 male
Corrector distance	75 mm from base of M48 thread
Tube weight	15 kg
Tube length	712 mm
Tube diameter	280.5 mm
Tube material	Carbon fiber
SKU	SS-260CDK

Gallery

Eastern Veil Nebula - Sharpstar SCA260 Super Aspherical Cassegrain Astrograph

SHARPSTAR ASTROGRAPHS