Quattro 250 ST
Astrophotography Reflectors
Product Features

A fast focal ratio of f/4

This is especially important for astrophotographers dealing with long exposure times. Imaging telescopes made of less thermally stable material can deviate from optimum focus after long time exposures. It can remain in focus for a longer period of time and long exposure images will stay clear and in focus.   Tube interiors are equipped with knife-edge ray traced baffles. 

2'' Dual-Speed Linear Power Focuser

The new linear power focuser utilises 4 precision ball bearings to support the drawtube and provide great stability and zero image shift while supporting a heavy eyepiece or camera. Moving the drawtube by the roller rather than a rack and pinion ensures exceptionally smooth operation and precise adjustability. The dual-speed feature has a second focus knob that has a 10:1-speed reduction to provide the super-fine adjustments even the most demanding users can appreciate.

Quality Mirror

It features paraboloidal primary mirrors made of Low-Expansion Borosilicate Glass resulting in substantially shorter cooling-down times.

It comes with an impressive 0.5 mm Ultra-Thin Secondary Mirror Supports and it offers 56% more Light-Gathering than the 200mm.

Optical Design Reflector 
Optical Diameter 254 
Focal Length 1000mm 
F/Ratio f/4 
Highest Practical Power 508x 
Finder Scope 8x50 
Focuser Diameter 2" (50.8mm) Dual-Speed 10:1 Linear Power Focuser 
Tube Weight 15.1 kg 
Tube Dimensions 25.75cmx73cm 
Shipping Weight 18.8 kg 
Shipping Dimensions 106x47x50 cm3 
Related Products