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Telescope specifications, compared

Every telescope here is listed with the two figures that actually decide what it can do: aperture, which sets how much light arrives and how fine a detail resolves, and focal length, which sets magnification with any given eyepiece. Focal ratio, maximum useful magnification and the Dawes resolution limit are calculated from those two rather than transcribed, so the numbers cannot contradict each other. Anything we could not verify is left blank rather than estimated.

Read the mount column first. A telescope is only as steady as what holds it, and a shaking image at 150x is unusable regardless of the optics. Entries marked "Optical tube only" ship with no mount at all, so their price is not the price of a working telescope. Check any pairing against the mount payload calculator.

Telescope Type Aperture Focal length f/ Mount Weight Max useful Budget tier
ZWO Seestar S30 Pro Smart telescope, apochromatic triplet 30 mm 150 mm f/5 Integrated alt-azimuth 3.3 lb 60x Under $750
ZWO Seestar S50 Smart telescope, apochromatic triplet 50 mm 250 mm f/5 Integrated alt-azimuth 6.4 lb 100x Under $750
William Optics RedCat 51 Petzval apochromatic refractor 51 mm 250 mm f/4.9 Optical tube only 3.2 lb 102x Under $1,000
Celestron AstroMaster 70AZ Achromatic refractor 70 mm 900 mm f/12.9 Alt-azimuth tripod 11 lb 140x Under $250
Celestron FirstScope 76 Newtonian reflector 76 mm 300 mm f/3.9 Tabletop Dobsonian 4.3 lb 152x Under $100
Celestron StarSense Explorer LT 80AZ Achromatic refractor 80 mm 900 mm f/11.3 Alt-azimuth tripod 18 lb 160x Under $500
SVBONY SV503 80ED ED doublet refractor 80 mm 560 mm f/7 Optical tube only 7.5 lb 160x Under $500
Sky-Watcher Evostar 80EDX ED doublet apochromatic refractor 80 mm 600 mm f/7.5 Optical tube only 8.6 lb 160x Under $1,000
Explore Scientific ED80 Essential ED doublet apochromatic refractor 80 mm 480 mm f/6 Optical tube only 6.6 lb 160x Under $1,000
Sky-Watcher Heritage 100P Newtonian reflector 100 mm 400 mm f/4 Tabletop Dobsonian 8.4 lb 200x Under $250
Celestron Inspire 100AZ Achromatic refractor 100 mm 660 mm f/6.6 Alt-azimuth tripod 17 lb 200x Under $500
Celestron StarSense Explorer DX 102AZ Achromatic refractor 102 mm 660 mm f/6.5 Alt-azimuth tripod with slow motion controls 18 lb 204x Under $500
Celestron NexStar 4SE Maksutov-Cassegrain 102 mm 1325 mm f/13 Computerised single fork arm 21 lb 204x Under $750
Sky-Watcher Skymax 102 Maksutov-Cassegrain 102 mm 1300 mm f/12.7 Optical tube only 4.2 lb 204x Under $500
Celestron Omni XLT 102 Achromatic refractor 102 mm 1000 mm f/9.8 CG-4 German equatorial 38 lb 204x Under $750
Bresser Messier AR-102 Achromatic refractor 102 mm 600 mm f/5.9 Optical tube only Not published 204x Under $500
Celestron Omni XLT 120 Achromatic refractor 120 mm 1000 mm f/8.3 CG-4 German equatorial 41 lb 240x Under $1,000
Celestron NexStar 5SE Schmidt-Cassegrain 125 mm 1250 mm f/10 Computerised single fork arm 28 lb 250x Under $1,000
Celestron PowerSeeker 127EQ Bird-Jones catadioptric Newtonian 127 mm 1000 mm f/7.9 EQ2 German equatorial 21 lb 254x Under $250
Sky-Watcher Skymax 127 Maksutov-Cassegrain 127 mm 1500 mm f/11.8 Optical tube only 7.7 lb 254x Under $500
Sky-Watcher Heritage 130P Newtonian reflector 130 mm 650 mm f/5 Tabletop Dobsonian 14 lb 260x Under $500
Celestron StarSense Explorer 130mm Tabletop Newtonian reflector 130 mm 650 mm f/5 Tabletop Dobsonian Not published 260x Under $500
Celestron StarSense Explorer DX 130AZ Newtonian reflector 130 mm 650 mm f/5 Alt-azimuth tripod with slow motion controls 18 lb 260x Under $500
Celestron NexStar 130SLT Newtonian reflector 130 mm 650 mm f/5 Computerised alt-azimuth 18 lb 260x Under $750
Celestron Astro Fi 130 Newtonian reflector 130 mm 650 mm f/5 Computerised alt-azimuth with WiFi 18 lb 260x Under $750
Explore Scientific FirstLight 130mm Newtonian reflector 130 mm 650 mm f/5 Alt-azimuth or EQ3 tripod Not published 260x Under $500
Sky-Watcher Heritage 150P Newtonian reflector 150 mm 750 mm f/5 Tabletop Dobsonian 24 lb 300x Under $500
Orion SkyQuest XT6 Classic Newtonian reflector 150 mm 1200 mm f/8 Dobsonian 34 lb 300x Under $500
Celestron NexStar 6SE Schmidt-Cassegrain 150 mm 1500 mm f/10 Computerised single fork arm 30 lb 300x Under $1,500
Sky-Watcher Star Discovery 150i Newtonian reflector 150 mm 750 mm f/5 Computerised alt-azimuth with WiFi Not published 300x Under $750
Apertura AD8 Newtonian reflector 203 mm 1200 mm f/5.9 Dobsonian 51 lb 406x Under $750
Sky-Watcher Classic 200P Newtonian reflector 203 mm 1200 mm f/5.9 Dobsonian 48 lb 406x Under $1,000
Celestron StarSense Explorer 8 inch Dobsonian Newtonian reflector 203 mm 1200 mm f/5.9 Dobsonian 46 lb 406x Under $1,000
Celestron NexStar 8SE Schmidt-Cassegrain 203 mm 2032 mm f/10 Computerised single fork arm 33 lb 406x Under $2,000
Celestron NexStar Evolution 8 Schmidt-Cassegrain 203 mm 2032 mm f/10 Computerised fork with internal battery 43 lb 406x Under $3,000
Celestron Advanced VX 8 inch EdgeHD Aplanatic Schmidt-Cassegrain 203 mm 2032 mm f/10 German equatorial, computerised 68 lb 406x Under $3,000
Zhumell Z8 Newtonian reflector 203 mm 1200 mm f/5.9 Dobsonian 51 lb 406x Under $750
Orion SkyQuest XT8 Classic Newtonian reflector 203 mm 1200 mm f/5.9 Dobsonian Not published 406x Under $750
Celestron CPC 800 Schmidt-Cassegrain 203 mm 2032 mm f/10 Computerised dual fork arm 58 lb 406x Under $3,000
Celestron EdgeHD 9.25 inch Aplanatic Schmidt-Cassegrain 235 mm 2350 mm f/10 Optical tube only 20 lb 470x $3,000+
Sky-Watcher Classic 250P Newtonian reflector 254 mm 1200 mm f/4.7 Dobsonian 62 lb 508x Under $1,500
Sky-Watcher Classic 300P Newtonian reflector 305 mm 1500 mm f/4.9 Dobsonian 90 lb 610x Under $2,000

Browse by optical design

Three designs cover almost the whole market, and the choice between them is a trade rather than a ranking. The refractor versus reflector comparison and the Schmidt-Cassegrain versus Newtonian comparison work through the details.

Refractors

Lens at the front, sealed tube, no collimation. High contrast per inch and the most expensive way to buy aperture.

Reflectors

Mirror at the back. The cheapest aperture in the hobby, at the cost of collimation and an open tube.

Catadioptrics

Mirror and corrector together, folding a long focal length into a short tube. Compact, and slow to cool.

Smart telescopes

Sealed imaging instruments with no eyepiece. They answer a different question than everything else here.

Where to go from a spec sheet

A specification tells you the limits. It does not tell you what the rest of the kit costs, which is where most first purchases go wrong: an eyepiece set, a finder, a diagonal, a red light and a case add up to real money on top of the tube.