254mm f/4 Dual-Speed Parabolic Imaging Newtonians -   The new QUATTRO series with their fast f/4 focal ratios, have been specially designed for high quality astrophotography with short exposure times. They are of course also fine telescopes for visual observations.

 

Tube interiors have knife-edge ray traced baffles.

This model is the QUATTRO-10S with Steel Tube

 

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 drawtubeby the roller rather than a rack and pinion ensures exceptionally smooth operation, great feel 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.

 

PYREX MIRRORS: Both models feature paraboloidal primary mirrors made of low thermal expansion Pyrex glass resulting in substantially shorter cooling-down times.

 

 

Standard Specification:

 

• Highest Practical Power (Potential) x508
• Diameter of Primary Mirror 254mm
• Telescope Focal Length 1000mm (f/4)
• Note: Eyepieces NOT supplied
• 9x50 Finderscope
• Parabolic Primary Mirror (Pyrex)
• 2" (50.8mm) Dual-Speed 10:1 Linear Power Focuser
• Tube Rings and Dovetail Bar
• 0.5mm Ultra-Thin Secondary Mirror Supports
• 56% more Light-Gathering than 200mm

 

 

 

Note: Fast Newtonians require precise collimation and a Coma Corrector in order to be used to their full potential.

 

 

See the Skywatcher F/4 Aplanatic Super Coma Corrector below