|
|
|
FAQ: Why choose a Newise?
How does it work? Is it good for imaging?
In a nutshell:
The revolutionary Newise range of telescopes use a modified Newtonian catadioptric optical system to deliver unrivalled performance in their class. With a small
25% central obstruction and
better than 1/8th wave wavefront error,
a Newise telescope boasts a Strehl ratio of
better than 88 percent. (By comparison, a typical Schmidt-Cassegrain has
a 35% central obstruction, a 1/4th wave wavefront error and a Strehl ratio less than 80 percent.)
Detailed Newise performance data may be found on our Imaging
page.
Telescope models:
| Primary mirror |
Central obstruction |
Focal length |
Overall length |
Tube weight |
Field of view |
Resolution |
| 200mm |
25% |
1200mm |
620mm |
6kg |
2.0° |
0.50 arcsec |
| 200mm |
25% |
1200mm |
620mm |
8kg * |
2.0° |
0.50 arcsec |
| 300mm |
21% |
1500mm |
850mm |
15kg |
1.6° |
0.33 arcsec |
| 400mm |
20% ** |
1800mm |
1050mm |
28kg |
1.3° |
0.25 arcsec |
| 500mm |
20% ** |
2250mm |
1300mm |
42kg |
1.2° |
0.20 arcsec |
| 600mm |
20% ** |
2500mm |
1600mm |
n/a |
1.0° |
0.17 arcsec |
| 800mm |
18% ** |
3200mm |
2200mm |
n/a |
1.0° |
0.13 arcsec |
| 1000mm |
18% ** |
4000mm |
2750mm |
n/a |
1.0° |
0.10 arcsec |
| * Aluminium tube; all others carbon-fibre. |
| ** Made to special order. Custom colours
available. |
| The resolution figures are theoretical as actual resolution depends upon sky conditions. |
Telescope options:
The 200mm f/6 Newise is available in an aluminium tube with a textured black
finish or a choice of colours. All other models are supplied with dark gray
lightweight carbon-fibre tubes. You also have a choice of a straight through
or right-angled 8x50 finder. We can supply custom-made dewshields (extra) or
you may opt for a Kendrick dew heater system.
Fittings for both 1.25-inch and 2-inch eyepieces are supplied. Cooling fans
for the primary mirror are fitted as standard equipment (with the exception
of the 200mm aluminium tube model, but they may be retro-fitted).
Ordering:
If you wish to purchase any of our standard products online, please proceed to our Buy Online page.
|
|
