Quattro-12S Steel Tube 300mm f/4 Dual Speed Parabolic Imaging Newtonian OTA
Steel Tube Only
The 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.
Please note the QUATTRO-12S is internally darkened and does not contain baffles like the other Quattro models.
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, 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 MIRROR: The QUATTRO-12S features a paraboloidal primary mirror made of low thermal expansion Pyrex glass resulting in substantially shorter cooling-down times.
Highest Practical Power (Potential) x600
Diameter of Primary Mirror 300mm
Telescope Focal Length 1200mm (f/4)
Note: Eyepieces NOT supplied
Parabolic Primary Mirror (Pyrex)
2" (50.8mm) Dual-Speed 10:1 Linear Power Focuser with 1.25" and 2" eyepiece adaptors
Tube Rings and Dovetail Bar
OTA Weight 23kg, Length 1090mm, Diameter 350mm
44% more Light-Gathering than 250mm
SKY-WATCHER DELUXE MIRROR COATINGS
Most reflectors today usually have a coat of aluminium as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is therefore more expensive. Protection is needed, because in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as standard for Optimum Durability and Long Term Performance.
|PARABOLIC PRIMARY MIRRORS
||Features High Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal lengh reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, constrasty images, which are full of detail.