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Sale!
Orion 250 ST astrophotography telescope (10″f/4)
1,589.95 $ 1,350.00 $
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- Products Features
- Steel TUBE (QUATTRO 250 ST):
Fast focal ratio of f/4.
Black Diamond P250/F1000 Reflector. 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. 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 (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.
- It comes with a impressive 0.5 mm Ultra-Thin Secondary Mirror Supports and it offers 56% more Light-Gathering than the 200mm.
- Specifications
- Optical DesignReflector
- Diameter254
- Focal Length1000mm
- F/Ratiof/4
- Highest Practical Power508x
- Finder Scope8×50
- Focuser Diameter2″ (50.8mm) Dual-Speed 10:1 Linear Power Focuser
- Tube Weight15.1 kg
- Tube Dimensions25.75cmx73cm
- Shipping Weight18.8 kg
- Shipping Dimensions106x47x50 cm
S11220
Out of stock
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