Description
Description
The Skywatcher Quattro 250P is an affordable, large aperture astrograph, ideal for users searching for a fast imaging system that will work for both astrophotography and visual astronomy. Boasting a swift f/4 focal ratio, this astrograph is can produce an exposure 6x faster than the average 8-inch f/10 Schmidt Cassegrain telescope. Although designed as an imaging optical tube, these Newtonians also produce bright and detailed viewing for visual astronomy.
Like all Sky-Watcher reflectors, the Quattro imaging Newtonian features borosilicate mirrors coated with Sky-Watcher’s proprietary Radiant™ Aluminum Quartz (RAQ™), producing 94% reflectivity. The tube is constructed with rolled steel, then coated with Sky-Watcher’s signature glossy metal-flake Black Diamond finish. The OTA uses an oversized secondary mirror providing greater illumination for DSLRs and CCDs using full-frame sensors, and an optional coma corrector is available for those who want to take their imaging to the next level.
Included with the Quattro imaging Newtonian is a 10:1 dual-speed 2-inch Crayford-style focuser, 1.25 and 2-inch eyepiece adapters, a 9×50 finderscope, tube rings, and a V-style dovetail plate.
Specifications
Optical Design: Newtonian
Mirror Coatings: Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity
Glass Type: Borosilicate
True Aperture: 257mm
Primary Aperture: 254mm
F/Ratio: 4
Focal Length:1000mm
Secondary Diameter: 89mm
Secondary Obstruction (by diameter): 35%
Secondary Obstruction by Area: 12%
Dawes Limit: 0.46
Rayleigh Limit: 0.55
Limiting Mag.: 14.5
Minimum Magnification:36X
Maximum Magnification: 500X
Light Gathering (compared to next size down): 57%
Focuser: 2″ Dual Speed Crayford
OTA Length (Retract/Ext.): 36.5″
OTA Outer Diameter: 11.375″
OTA Weight (with accessories): 16.56kg
In The Box
9×50 Finder
Mounting Accessories: Rings/V-Rail
