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- 205mm aperture, 800mm focal length
- Fast f/4 focal ratio
- Parabolic mirror designed for imaging with 94% reflectivity
- 10:1, dual-speed, 2-inch Crayford-style focuser
- Oversized secondary mirror produces greater illumination for full-frame DSLR and CCD cameras
- Tube rings, mounting plate, eyepiece adapters, and 9x50 finderscope included
The Quattro imaging Newtonian 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 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 Newtonian is a 10:1 dual-speed 2-inch Crayford-style focuser, 1.25 and 2-inch eyepiece adapters, a 9x50 finderscope, tube rings, and a V-style dovetail plate.
SKU | S11210 |
UPC | 050234112109 |
Optical Info | |
---|---|
Optical Design | Newtonian |
Mirror Coatings | 94% Aluminum |
Glass Type | Borosilicate |
Primary Aperture (mm) | 203 |
F/Ratio | 4 |
Focal Length (mm) | 800 |
Secondary Diameter | 70mm |
Secondary Obstruction (by diameter) | 34% |
Secondary Obstruction by Area | 12% |
Observational Info | |
Dawes Limit | 0.57 |
Rayleigh Limit | 0.69 |
Limiting Mag. | 14 |
Minimum Magnification | 29 |
Maximum Magnification | 400 |
Light Gathering (compared to next size down) | 78% |
General Info | |
Focuser | 2" Dual Speed Crayford |
OTA Length (Retract/Ext.) | 28" |
OTA Outer Diameter | 9.375" |
OTA Weight (with accessories) | 21 |
Accessories | |
Included Finder | 9x50 Finder |
Included Diagonal | No |
Mounting Accessories | Rings/V-Rail |
Included Eyepieces | None |
Included Case | No |
Corrector | No (optional) |