If you are an astro-photographer looking for a fast optical system at a fantastic price then the Quattro series is for you.
The Sky-Watcher 8" f/4 Quattro Imaging Newtonian has . . .
- 205mm aperture/800mm focal length f/4 Newtonian reflector optics
- Fully multi-coated borosilicate mirrors
- 2” 10:1 ratio dual-speed focuser
- 8x50 finderscope
- Tube rings with V-style dovetail bar
The 8" Sky-Watcher Quattro Imaging Newtonian with dual-speed focuser is optimized for wide-field deep space imaging, but can also be used for pleasing visual observing. It incorporates a superbly-figured multi-coated borosilicate optical glass mirror-set. Additionally, the tube length has been slightly shortened to optimize performance for wide-field prime-focus photography. Even better field edge performance for astrophotography, and visual use, can be achieved by adding the Sky-Watcher Quattro coma corrector.
This Sky-Watcher 8" Quattro imaging Newtonian is ultra-fast and incredibly simple to use. The f/4 optical system allows the user to capture wide field images of faint deep space objects such as nebulae, open clusters, and galaxies over six times faster than using an f/10 system. This gives you the ability to acquire more images in less time. The Newtonian optical design is one of the most basic, and therefore trouble-free, systems available to astrophotographers.
Tech Details:
| Aperture |
8" |
| Focal Length |
800mm |
| Focal Ratio |
f/4 |
| Weight |
21 pounds |
| Optical Coatings |
Fully Multi-Coated |
| Supplied Eyepiece |
None |
| Telescope Type |
Reflector |
| View Finder |
8x50 |
| Warranty |
2 years |
| SKU |
S11210 |
| UPC |
050234112109 |
| Optical Info |
|
| Optical Design |
Newtonian |
| Mirror Coatings |
Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity |
| 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) |
Supplied Accessories:
8x50 Finder Tube Rings with Vixen style dovetail bar