Newtonian (parabolic) mirror uses a curved mirror to reflect light to a focal point, the basic principle is to focus parallel rays of light to a single point through a parabolic mirror to achieve magnification .
Compared with other types of telescopes, regardless of the size of the aperture, the Newtonian is always cheaper in terms of quality.
Since the light does not have to pass through the objective (it only reflects off the surface of the mirror), no special glass is needed, the material just needs to be able to hold the right shape.
Because there is only one surface to deal with (refractors usually need to deal with four surfaces), it is ideal for non-professionals to make their own personal styles. Most Dobson telescopes built by amateur astronomers are of this type.
A shorter focal ratio makes it easier to get a larger field of view.
Long focal lengths of Newtonian telescopes allow for superior planetary appearance.
No chromatic aberration caused by refractors.
The location of the eyepiece at the front of the telescope, combined with the short focal ratio, allows for the use of a short and compact mounting system, reducing cost and increasing convenience.
Specifications of Newtonian (parabolic ) mirror
| Metallic Coating | Aluminum |
| Reflectance (Average) | >90% VIS |
| Off-Axis Angle | 90° |
| Clear Aperture | >90% of Diameter |
| Surface Roughness (RMS) | < 100 Å |
| Surface Quality | 40-20 Scratch-Dig |
| Parent Focal Length Tolerance | ±1% |
| Reflected Focal Length Tolerance | ±1% |
| Substrate | Aluminum |
| Manufacturing Process | Diamond Turned |
Products List
| Tpye NMo. | Diameter (mm) | Clear Aperture (mm) | Edge Thickness (mm) | Focal Ratio | Parabolic Focal Length (mm) |
| NM108-4.0 | 108 | 102 | 20 | 4 | 435 |
| NM108-4.5 | 108 | 102 | 20 | 4.5 | 486 |
| NM108-5.0 | 108 | 102 | 20 | 5 | 540 |
| NM108-5.5 | 108 | 102 | 20 | 5.5 | 595 |
| NM108-6.0 | 108 | 102 | 20 | 6 | 650 |
| NM152.4-4.0 | 152.4 | 148 | 25 | 4 | 610 |
| NM152.4-4.5 | 152.4 | 148 | 25 | 4.5 | 690 |
| NM152.4-5.0 | 152.4 | 148 | 25 | 5 | 762 |
| NM152.4-5.5 | 152.4 | 148 | 25 | 5.5 | 840 |
| NM152.4-6.0 | 152.4 | 148 | 25 | 6 | 915 |
| NM203-4.0 | 203 | 200 | 28 | 4 | 810 |
| NM203-4.5 | 203 | 200 | 28 | 4.5 | 910 |
| NM203-5.0 | 203 | 200 | 28 | 5 | 1010 |
| NM203-5.5 | 203 | 200 | 28 | 5.5 | 1120 |
| NM203-6.0 | 203 | 200 | 28 | 6 | 1220 |
| NM254-4.0 | 254 | 250 | 32 | 4 | 1016 |
| NM254-4.5 | 254 | 250 | 32 | 4.5 | 1140 |
| NM254-5.0 | 254 | 250 | 32 | 5 | 1270 |
| NM254-5.5 | 254 | 250 | 32 | 5.5 | 1400 |
| NM254-6.0 | 254 | 250 | 32 | 6 | 1520 |
| NM305-4.0 | 305 | 300 | 38 | 4 | 1220 |
| NM305-4.5 | 305 | 300 | 38 | 4.5 | 1370 |
| NM305-5.0 | 305 | 300 | 38 | 5 | 1530 |
| NM305-5.5 | 305 | 300 | 38 | 5.5 | 1680 |
| NM305-6.0 | 305 | 300 | 38 | 6 | 1830 |
| NM356-4.0 | 356 | 350 | 42 | 4 | 1420 |
| NM356-4.5 | 356 | 350 | 42 | 4.5 | 1600 |
| NM356-5.0 | 356 | 350 | 42 | 5 | 1780 |
| NM356-5.5 | 356 | 350 | 42 | 5.5 | 1960 |
| NM356-6.0 | 356 | 350 | 42 | 6 | 2140 |
| NM406-4.0 | 406 | 400 | 45 | 4 | 1620 |
| NM406-4.5 | 406 | 400 | 45 | 4.5 | 1830 |
| NM406-5.0 | 406 | 400 | 45 | 5 | 2030 |
| NM406-5.5 | 406 | 400 | 45 | 5.5 | 2230 |
| NM406-6.0 | 406 | 400 | 45 | 6 | 2440 |
| NM458-4.0 | 458 | 450 | 50 | 4 | 1830 |
| NM458-4.5 | 458 | 450 | 50 | 4.5 | 2060 |
| NM458-5.0 | 458 | 450 | 50 | 5 | 2300 |
| NM458-5.5 | 458 | 450 | 50 | 5.5 | 2480 |
| NM458-6.0 | 458 | 450 | 50 | 6 | 2750 |
The main application of Newton (parabolic) mirror is astronomical observation .
The Newton parabolic mirror is the core component of Isaac Newton's reflective telescope, which uses a parabolic mirror as its primary mirror to focus light from infinite distances to form a sharp image
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