Visual observing
Look through an eyepiece and see as much as the sky and the optics allow.
Aperture, contrast and a mount you enjoy using. The one purpose where the cheapest telescope on this site is often the right answer.
Find the right telescope for your sky.
Compare optics, imaging performance, mount demands, portability and value — based on what you actually want to observe or photograph.
Compare two telescopes
Comparisons worth reading
Hand-written, not generated. Each one answers all four purposes separately, because the winner usually changes when the purpose does.
- Sky-Watcher Classic 200P Dobsonian vs Celestron NexStar 8SEOptically these are close to equals, and the Dobsonian costs far less. What the 8SE sells you is tracking, GoTo and compactness — and whether those are worth the difference depends almost entirely on your sky, your storage and how much you enjoy finding things yourself.
- Celestron NexStar 6SE vs Celestron NexStar 8SEThe 8SE shows more of everything and is the better telescope on any night you actually set it up. The 6SE is lighter, steadier on the same fork, and gets carried outside more often — which is why plenty of people who own both keep reaching for the smaller one.
- Celestron RASA 11 vs Celestron EdgeHD 11If you photograph large nebulae, the RASA is the right telescope and the EdgeHD is the wrong one. If you photograph small galaxies or planets, that reverses completely. And if you ever want to look through the telescope, only one of them has an eyepiece — the RASA physically cannot be used visually.
- William Optics RedCat 51 vs Explore Scientific ED102The RedCat is a wide-field imaging instrument with no eyepiece and no ambitions beyond that; the ED102 is twice the aperture, works beautifully at the eyepiece, and needs a flattener and a heavier mount before it images. Choose the RedCat if imaging wide nebulae is the goal, the ED102 if you want one telescope that does several things well.
Browse by what you want to do
Purpose comes before product here. A telescope that is outstanding for one of these can be genuinely unsuitable for another.
Deep-sky astrophotography
Photograph faint extended objects over hours of exposure.
Two very different jobs under one name: wide nebulae want a fast, short instrument; small galaxies want a long, precise one.
Planetary imaging
Capture high-resolution video of the Moon and planets and stack the sharpest frames.
Aperture and long focal length, plus the patience to wait for the atmosphere to cooperate.
Browse by optical design
Some designs are general-purpose instruments. Others are cameras that cannot be looked through. We keep the two groups separate on purpose.
Visual and all-rounder designs
- Achromatic refractorsClassic two-element lens telescopes: cheap, sealed, maintenance-free, and visibly false-colour on bright targets.
- ED refractorsDoublets using extra-low-dispersion glass: most of the colour correction of an apo for much less money.
- Apochromatic refractorsThree or more elements bringing red, green and blue to a common focus. Sharp, contrasty, and equally at home visually or on a camera.
- Newtonian reflectorsThe cheapest way to buy aperture, in exchange for bulk and routine collimation.
- DobsoniansA Newtonian tube on a simple alt-azimuth base. Almost always the most aperture per pound spent, and almost never an imaging platform.
- Schmidt-CassegrainsA long focal length folded into a short tube. The most common serious all-rounder, and the default choice for planetary imaging at scale.
- Maksutov-CassegrainsSmall, sealed, high-contrast compound telescopes built around a thick meniscus corrector. Superb on the Moon, planets and double stars; slow and narrow-field for everything else.
Dedicated and imaging-focused designs
- Petzval refractorsRefractors with the field flattener built into the optical design: focus, attach a camera, and the stars are round to the corners.
- Imaging NewtoniansFast Newtonians built around a camera: large secondary, low-profile focuser, and a coma corrector that is not optional.
- Ritchey-ChretiensTwo hyperbolic mirrors, no coma, long focal length. The classic small-galaxy instrument — and the least forgiving of a mediocre mount.
- RASA astrographsAn extremely fast Schmidt camera with the sensor at prime focus. There is no eyepiece and there never will be.
In the catalogue
14 telescopes, each scored against the same four purposes with the same weights.See all telescopes.
Schmidt-CassegrainOTA only
Celestron EdgeHD 11 (OTA)
- Aperture
- 279.4 mm (11")
- Focal length
- 2800 mm (110.2")
- Focal ratio
- f/10
A superb long-focal-length instrument that will expose every weakness in your mount, your seeing and your guiding before it shows you what it can do.
Schmidt-Cassegrain
Celestron NexStar 6SE
- Aperture
- 150 mm (5.9")
- Focal length
- 1500 mm (59.1")
- Focal ratio
- f/10
The most portable telescope here that is still a serious instrument, and the easiest complete package to actually get outside on a weeknight.
Schmidt-Cassegrain
Celestron NexStar 8SE
- Aperture
- 203.2 mm (8")
- Focal length
- 2032 mm (80")
- Focal ratio
- f/10
The most capable complete package here for planets and small deep-sky objects, on a mount that is at its honest limit carrying it.
Rowe-Ackermann Schmidt AstrographCamera onlyOTA only
Celestron RASA 11 (OTA)
- Aperture
- 279.4 mm (11")
- Focal length
- 620 mm (24.4")
- Focal ratio
- f/2.2
The fastest way to collect deep-sky photons at this aperture, sold to people who must accept that there is no eyepiece and never will be.
Ritchey-ChretienOTA only
Explore Scientific 8" Ritchey-Chretien (OTA)
- Aperture
- 203.2 mm (8")
- Focal length
- 1624 mm (63.9")
- Focal ratio
- f/8
The cheapest honest route to real galaxy image scale, provided you accept that collimating a Ritchey-Chretien is a skill you will have to acquire.
Apochromatic refractorOTA only
Explore Scientific ED102 FCD-100 (OTA)
- Aperture
- 102 mm (4")
- Focal length
- 714 mm (28.1")
- Focal ratio
- f/7
The classic do-everything four-inch apo: excellent visually, capable on nebulae with a flattener, and never the cheapest way to any single goal.
Guides that answer the question behind the question
Most telescope decisions go wrong before a product is chosen. These are the foundations.
How to choose a telescope for visual observing
Most first-telescope regret comes from answering the optics question before the logistics question. Here is the order that actually works.
Focal length and focal ratio explained
Two numbers that get confused constantly. One decides framing and magnification; the other decides how quickly a camera records extended objects — and neither makes a visual image brighter.
Refractor vs reflector vs compound
Lenses, mirrors, or both. The choice sets your cost per millimetre of aperture, your maintenance routine and your field of view — and it is far less about image quality than the arguments suggest.
Why the mount matters more than beginners expect
A modest telescope on a good mount beats an excellent telescope on a marginal one, every time. Here is why, and what to look for.
How comparisons work here
One source of facts
Every specification is stored once and reused everywhere. If a number is wrong on one page it is wrong on all of them — which makes it easy to fix.
Scores you can audit
Each score expands to show its factors, its weights, and which parts are derived from specifications rather than editorial judgement.
Verdicts, not averages
The arithmetic is a starting point. Where a number misses something that matters, the written verdict overrides it and says why.