Sky-Watcher Quattro 300P
1,214.00
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305 mm parabolic Newtonian astrograph designed primarily for astrophotography. The Sky-Watcher Quattro 300P features a 1200 mm focal length at f/4, low-expansion borosilicate mirrors and a 2-inch dual-speed 10:1 Linear Power focuser.
Designed primarily for astrophotography, the Sky-Watcher Quattro 300P combines a 305 mm parabolic Newtonian optical system with a 1200 mm focal length and fast f/4 focal ratio.
Its low-expansion borosilicate mirrors provide good thermal stability, while Radiant Aluminum Quartz RAQ coatings deliver a stated reflectivity of 94%.
The 2-inch dual-speed 10:1 Linear Power focuser provides precise and stable focusing with cameras and heavier imaging accessories.
Its 305 mm aperture provides substantial light-gathering capability, particularly useful for imaging and observing galaxies, nebulae and star clusters.
The internally darkened steel tube is supplied with tube rings, a 45 mm dovetail bar and a 9 × 50 optical finderscope.
305 mm Parabolic Primary Mirror
The primary mirror has a diameter of 305 mm and a parabolic surface.
This geometry brings incoming light rays to the same focal point and eliminates the spherical aberration associated with spherical mirrors used at fast focal ratios.
Fast f/4 Focal Ratio
With a 1200 mm focal length and 305 mm aperture, the Quattro 300P operates at f/4.
This fast focal ratio is particularly suited to deep-sky imaging and is one of the defining characteristics of the Quattro range.
Large Aperture for Deep-Sky Imaging
Sky-Watcher states that the Quattro 300P gathers 44% more light than a 250 mm instrument.
This substantial aperture is particularly beneficial for observing and imaging faint galaxies, nebulae and star clusters.
Borosilicate Mirrors
The primary and secondary mirrors are manufactured from low-expansion borosilicate glass.
This material reduces dimensional changes caused by temperature variations and helps the optical surfaces remain more stable while reaching thermal equilibrium.
Radiant Aluminum Quartz RAQ Coating
The primary and secondary mirrors feature Sky-Watcher Radiant Aluminum Quartz RAQ coatings.
The coating combines reflective aluminium, a dielectric tantalum pentoxide layer and a protective silicon dioxide layer.
Sky-Watcher specifies 94% reflectivity.
100 mm Secondary Mirror
The secondary mirror has a 100 mm minor axis.
It is supported by four 0.5 mm thin spider vanes designed to minimise optical obstruction and diffraction effects.
2-Inch Linear Power Focuser
Focusing is provided by a 2-inch dual-speed Linear Power focuser.
The drawtube is supported by four precision ball bearings to provide good mechanical stability with a camera or heavy accessory.
The 10:1 reduction allows highly precise fine focusing.
1.25-Inch and 2-Inch Compatibility
Adapters for both 1.25-inch and 2-inch accessories and eyepieces are supplied.
No eyepiece is included with the optical tube.
Fully Collimatable Optics
Both primary and secondary mirrors are fully collimatable.
The primary mirror cell incorporates large knurled adjustment knobs for convenient collimation.
9 × 50 Finderscope
A fully multi-coated 9 × 50 optical finderscope is supplied.
Its crosshair reticle assists with locating and centring celestial objects.
Technical Specifications
• Manufacturer : Sky-Watcher
• Model : Quattro 300P
• Product code : 10237
• Type : Newtonian astrograph
• Primary mirror diameter : 305 mm
• Primary mirror : Parabolic
• Focal length : 1200 mm
• Focal ratio : f/4
• Mirror material : Low-expansion borosilicate glass
• Secondary mirror diameter : 100 mm
• Mirror coating : Radiant Aluminum Quartz RAQ
• Stated reflectivity : 94%
• Secondary mirror supports : Four 0.5 mm vanes
• Focuser : Linear Power
• Focuser size : 2 inch
• Reduction ratio : 10:1
• Drawtube support : Four precision ball bearings
• Eyepiece compatibility : 1.25 inch and 2 inch
• Supplied eyepieces : None
• Highest practical power stated : 610×
• Finder : 9 × 50 with crosshair reticle
• Collimation : Adjustable primary and secondary mirrors
• Optical tube : Internally darkened rolled steel
• Tube rings : Included
• Dovetail : 45 mm
• Camera adapter : Included
• Optical tube weight : 21.8 kg
• Stated light gathering compared with 250 mm : +44%
Package Contents
• Sky-Watcher Quattro 300P optical tube
• Tube rings
• 45 mm dovetail bar
• 9 × 50 finderscope with crosshair reticle
• 1.25-inch eyepiece adapter
• 2-inch eyepiece adapter
• Camera adapter
Skywatcher Quattro 300P
Specific References
- UPC
- 10237
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305 mm parabolic Newtonian astrograph designed primarily for astrophotography. The Sky-Watcher Quattro 300P features a 1200 mm focal length at f/4, low-expansion borosilicate mirrors and a 2-inch dual-speed 10:1 Linear Power focuser.