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250mm 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.
Two versions of the QUATTRO-10 OTA's are available:
QUATTRO-10S with Steel Tube
QUATTRO-10CF with Carbon Fibre Tube (illustrated)
CARBON FIBRE TUBE (QUATTRO-10CF only): Carbon fibre is a strong and lightweight material and has much better thermal stability compared to a steel tube. This is especially important for astro-photographers dealing with long exposure times. Imaging telescopes made of less thermally stable material can deviate from optimum focus after long time exposures. With a carbon fibre tube, it can remain in focus for a longer period of time and long exposure images will stay clear and in focus.
2" DUAL-SPEED LINEAR POWER FOCUSER (both models): 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
| QUATTRO-10CF (Carbon Fibre Tube) |
10236 |
£ 879.00 |
| QUATTRO-10S (Steel Tube) |
10239 |
£ 579.00 |
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