Astronomy Specialist

SHARPSTAR SCA260 SUPER CASSEGRAIN ASTROGRAPH F/5

$6,699.00

Quantity
- +

 

Available early 2021

 

The Sharpstar SCA260 is an Aspherical Cassegrain astrograph with a fast focal ratio of f/5 and a focal length of 1300mm.   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 quadruplet air-spaced 3" field flattener optimized for full-frame photography with minimal vignetting. The heave 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.

 

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

Quadruplet 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

Focuser

Rack & pinion, dual speed (10:1) 3.2" diameter

Camera connection

M54 x 0.75 male, M48 x 0.75 male

Corrector distance

75 mm

Tube weight

15 kg

Tube length

712 mm

Tube diameter

280.5 mm

Tube material

Carbon fiber

SKU

SS-260CDK

 

 

Eastern Veil Nebula - Sharpstar SCA260 Super Aspherical Cassegrain Astrograph
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