The most aperture per dollar, and an alignment to keep
A Newtonian reflector puts a curved mirror at the bottom of an open tube and a small flat mirror near the top to send the light out to the side, and because a mirror needs only one polished surface instead of four, it buys more aperture for the money than any other design. Aperture is the figure that matters: it decides how much light arrives and how fine a detail can be separated, and no eyepiece recovers what the opening did not collect. What the design asks in return is collimation — the two mirrors have to be aimed at each other, and a tube that has been moved will drift out of true. It is a five-minute job with the right tool and a permanent irritation without one. Two more figures belong in the reading. The secondary obstruction, given as a percentage of the aperture, takes a little contrast out of planetary views; a photographic Newtonian carries a larger one than a planetary tube by design, not by accident. And the focal ratio sets both the field of view and how demanding the tube is of its eyepieces — fast mirrors below f/5 show coma at the edge and reward better glass. Read the mirror coating the maker publishes, and read the tube length against the trunk of the car that has to carry it. We compare aperture, focal length and ratio, optical design, mirror coating, secondary obstruction, focuser type, tube length, collimation access, mount supplied and supplied accessories.
76 mm (2.99 in) mirror · 700 mm (27.6 in) focal length · f/9.2 · equatorial mount · 152x recommended maximum
National Geographic's N 76/700 EQ: a 76 mm Newtonian at 700 mm focal length on an equatorial mount, advertised to 233x with a recommended maximum of 152x stated in the same description.
Best for: A first equatorial telescope light enough to move fully assembled
130 mm (5.1 in) Newtonian · German equatorial with slow-motion cables · 1.5x erecting Barlow · 13% Moon filter · phone adapter
SOLOMARK's 130EQ: a 130 mm Newtonian with fully coated optics and a carbon-fiber-look tube on a German equatorial mount with slow-motion cables, two eyepieces, a 1.5x erecting Barlow, a 13% Moon filter and a phone adapter.
Best for: A second telescope, or a first for someone willing to learn an equatorial mount
≈ $270
114 mm (4.5 in) Newtonian · German equatorial with slow-motion altitude rod · 20 mm and 4 mm eyepieces · 3x Barlow
Celestron's PowerSeeker 114EQ: a 114 mm Newtonian on a manual German equatorial mount with a slow-motion altitude rod, supplied with 20 mm and 4 mm eyepieces and a 3x Barlow.
Best for: A first equatorial reflector bought on price
≈ $180
127 mm (5 in) Newtonian · German equatorial with slow-motion altitude rod · 20 mm and 4 mm eyepieces · 3x Barlow
Celestron's PowerSeeker 127EQ: a 127 mm Newtonian on a manual German equatorial mount with a slow-motion altitude rod, supplied with 20 mm and 4 mm eyepieces and a 3x Barlow.
Best for: The most aperture on this shelf for about $200
≈ $200
130 mm (5.1 in) Newtonian · RA motor drive included · aluminum and SiO2 coatings · slow motion on both axes
Celestron's AstroMaster 130EQ-MD: a 130 mm Newtonian with aluminum and SiO2 coatings on a German equatorial mount with slow motion on both axes and an RA motor drive for automatic tracking.
Best for: Long sessions at high power on the Moon and planets, without nudging
≈ $390
130 mm (5.1 in) Newtonian · aluminum and SiO2 coatings · German equatorial with slow motion on both axes · no motor
Celestron's AstroMaster 130EQ: a 130 mm Newtonian with aluminum and SiO2 coatings on a manual German equatorial mount with slow motion on both axes, a 20 mm erect-image eyepiece, a 10 mm eyepiece and a StarPointer.
Best for: Five inches of mirror on a geared equatorial, for an observer content to turn the knobs
≈ $290
114 mm (4.5 in) Newtonian · aluminum and SiO2 coatings · German equatorial with slow motion on both axes · 20 mm erect-image and 10 mm eyepieces
Celestron's AstroMaster 114EQ: a 114 mm Newtonian with aluminum and SiO2 coatings on a manual German equatorial mount with two slow-motion knobs, a 20 mm erect-image eyepiece, a 10 mm eyepiece and a StarPointer finder.
Best for: A 114 mm whose mount can be aimed properly, for a family that will use it from a chair or standing
≈ $320
114 mm (4.5 in) · 500 mm (19.7 in) focal length · f/4.4 · 19x and 51.5x · alt-azimuth mount · red-dot finder
National Geographic's 114/500 Newtonian: a 114 mm mirror at 500 mm focal length on an alt-azimuth mount and full-size tripod, with two eyepieces giving 19x and 51.5x, a red-dot finder and a smartphone adapter.
Best for: Wide, bright low-power views of large objects, by someone who will learn to collimate
≈ $75
114 mm (4.49 in) mirror · 900 mm (35.4 in) focal length · f/7.9 · alt-azimuth mount
A 114/900 Newtonian reflector on a simple alt-azimuth mount and aluminum tripod, supplied with 25, 9 and 4 mm eyepieces, a 6x30 finder, a 1.5x erecting lens and a 3x Barlow.
Best for: A family telescope for planets and bright deep-sky objects, where nobody wants to learn polar alignment
130 mm (5.1 in) Newtonian · StarSense smartphone sky recognition · manual alt-azimuth with slow motion on both axes
Celestron's StarSense Explorer DX 130AZ: a 130 mm Newtonian on a manual alt-azimuth mount with dual-axis slow motion, whose phone dock and app read the stars overhead and guide the observer to a target.
Best for: A beginner who wants to see things this month rather than learn to star-hop first
≈ $500
Aperture is what a Newtonian offers cheaply compared with any other optical formula, and it remains the decisive quantity.
The published mirror coating decides how much light actually reaches the eyepiece, at identical diameter.
The share of the main diameter blocked by the secondary mirror. It is published as a percentage and affects contrast.
That depends on transport and on the model. Published collimation access says what the maker has provided for that adjustment.
The coating applied and the reflectivity stated. It is a maker’s figure, reported as given.
Because it depends on the eyepiece, not the telescope. Published focal length and ratio are what let you calculate it.
The formula chosen, published by the maker. It explains the general behavior and any corrector fitted.
The published focuser type says so. It decides which eyepieces fit without an adapter.
Mirrors age, and makers publish their maintenance recommendations. This site prescribes no intervention.
That depends on the focuser and the back focus available, both published. This site describes no setup.
A Newtonian buys diameter cheaply and pays for it in collimation. Secondary obstruction and mirror coating say how much of that diameter is left by the time the light reaches the eye.
The column is shown only when four instruments in five publish the figure. Below that, it would be comparing the absence of numbers.
| Model | Price | Aperture | Mount supplied | Optical design | Supplied accessories |
|---|---|---|---|---|---|
| National Geographic 114/500 reflector (80-30114s) | $75 | 114 mm (4.5 in), stated | Alt-azimuth mount on a full-size tripod | Newtonian reflector | Two eyepieces giving 19x and 51.5x (focal lengths not named; about 26 mm and 9.7 mm by arithmetic) · red-dot finder · smartphone adapter |
| Celestron PowerSeeker 114EQ (21045) | $180 | 114 mm (4.5 in), stated | Manual German equatorial with a slow-motion altitude rod · no tools needed | Newtonian reflector | 20 mm and 4 mm eyepieces · 3x Barlow lens · astronomy software download |
| Celestron PowerSeeker 127EQ (21049) | $200 | 127 mm (5 in), stated | Manual German equatorial with a slow-motion altitude rod · no tools needed | Newtonian reflector | 20 mm and 4 mm eyepieces · 3x Barlow lens · astronomy software download |
| SOLOMARK 130EQ | $270 | 130 mm (5.1 in), stated | German equatorial with dial and slow-motion control cables · large-diameter adjustable aluminum tripod with tray | Newtonian reflector · carbon-fiber covering on the tube surface, stated | Two eyepieces (focal lengths not named) · 1.5x erecting Barlow · 1.25 in Moon filter, 13% transmission · cellphone adapter |
| Celestron AstroMaster 130EQ (31045) | $290 | 130 mm (5.1 in), stated | Manual German equatorial · slow-motion knobs on both axes · adjustable tripod, no tools | Newtonian reflector | 20 mm erect-image eyepiece · 10 mm eyepiece · StarPointer red-dot finder · software download |
| Celestron AstroMaster 114EQ (31042) | $320 | 114 mm (4.5 in), stated | Manual German equatorial · slow-motion knobs for right ascension and declination · adjustable tripod, no tools needed | Newtonian reflector | 20 mm eyepiece with built-in erect-image corrector · 10 mm eyepiece · StarPointer red-dot finder · astronomy software download |
| Celestron AstroMaster 130EQ-MD (31051) | $390 | 130 mm (5.1 in), stated | German equatorial · slow-motion knobs on both axes · RA motor drive for automatic tracking · adjustable tripod | Newtonian reflector | 20 mm erect-image eyepiece · 10 mm eyepiece · motor drive · StarPointer red-dot finder · software download |
| Celestron StarSense Explorer DX 130 (22461) | $500 | 130 mm (5.1 in), stated | Manual alt-azimuth with dual-axis slow-motion controls · StarSense phone dock | Newtonian reflector with high-reflectivity coatings | StarSense smartphone dock and app (sky recognition, target list) |
| National Geographic 114/900 AZ | — | 114 mm (4.49 in), stated in the listing | Alt-azimuth mount on an aluminum tripod | Newtonian reflector, stated | Eyepieces of 25 mm, 9 mm and 4 mm · 6x30 finder · 1.5x erecting lens · 3x Barlow lens · magnification range stated as 36x to 675x |
| National Geographic 76/700 EQ | — | 76 mm (2.99 in) primary mirror, stated | Equatorial mount | Newtonian reflector | Not itemized in the Amazon.com listing · magnification up to 233x, recommended maximum 152x, stated |
$75 – $180
2 models
National Geographic 114/500 reflector (80-30114s), Celestron PowerSeeker 114EQ (21045)
$290 – $500
4 models
Celestron AstroMaster 130EQ (31045), Celestron AstroMaster 114EQ (31042), Celestron AstroMaster 130EQ-MD (31051)
Specifications: manufacturer sheets for telescopes and observing optics and the matching Amazon product pages. Prices and availability: Keepa. Every figure in this table names its source.
Most recent revision in this category: November 7, 2026.
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
