Telescope catalogue

14 telescopes, each scored against the same four purposes with the same weights. Every one of them is a legitimate choice for something and a poor choice for something else.

279.4 mm · f/10
Scale schematic — product photography not yet licensed for this record.

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.

150 mm · f/10
Scale schematic — product photography not yet licensed for this record.

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.

203.2 mm · f/10
Scale schematic — product photography not yet licensed for this record.

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.

279.4 mm · f/2.2
Scale schematic — product photography not yet licensed for this record.

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.

203.2 mm · f/8
Scale schematic — product photography not yet licensed for this record.

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.

102 mm · f/7
Scale schematic — product photography not yet licensed for this record.

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.

203 mm · f/5.9
Scale schematic — product photography not yet licensed for this record.

DobsonianDiscontinued

Orion SkyQuest XT8 Classic Dobsonian

Aperture
203 mm (8")
Focal length
1200 mm (47.2")
Focal ratio
f/5.9

No longer made, but a used XT8 in good condition remains one of the best-value visual telescopes you can own.

203 mm · f/5.9
Scale schematic — product photography not yet licensed for this record.

Dobsonian

Sky-Watcher Classic 200P Dobsonian

Aperture
203 mm (8")
Focal length
1200 mm (47.2")
Focal ratio
f/5.9

More light grasp per unit of money than anything else on this site, on the simplest mount ever devised, with no imaging future whatsoever.

72 mm · f/5.8
Scale schematic — product photography not yet licensed for this record.

ED refractorOTA only

Sky-Watcher Evostar 72ED (OTA)

Aperture
72 mm (2.8")
Focal length
420 mm (16.5")
Focal ratio
f/5.8

The most sensible entry into wide-field deep-sky imaging, provided you budget for the flattener it does not include.

150 mm · f/5
Scale schematic — product photography not yet licensed for this record.

Newtonian reflector

Sky-Watcher Explorer 150P EQ3

Aperture
150 mm (5.9")
Focal length
750 mm (29.5")
Focal ratio
f/5

Good optics on a mount that is adequate for looking and marginal for photographing. Buy it to observe, not as an imaging platform in disguise.

200 mm · f/4
Scale schematic — product photography not yet licensed for this record.

Imaging NewtonianOTA only

Sky-Watcher Quattro 200P (OTA)

Aperture
200 mm (7.9")
Focal length
800 mm (31.5")
Focal ratio
f/4

Enormous imaging aperture for the money, sold to people who underestimate what f/4 and 8.5 kg do to a mount.

127 mm · f/11.8
Scale schematic — product photography not yet licensed for this record.

Maksutov-CassegrainOTA only

Sky-Watcher Skymax 127 (OTA)

Aperture
127 mm (5")
Focal length
1500 mm (59.1")
Focal ratio
f/11.8

The best lunar and planetary view available from a telescope this small, bought at the cost of a very narrow field and a long cooldown.

102 mm · f/4.9
Scale schematic — product photography not yet licensed for this record.

Achromatic refractorOTA only

Sky-Watcher StarTravel 102 (OTA)

Aperture
102 mm (4")
Focal length
500 mm (19.7")
Focal ratio
f/4.9

A cheap, light, genuinely fun rich-field refractor for sweeping the Milky Way, badly miscast as a planetary or imaging telescope.

51 mm · f/4.9
Scale schematic — product photography not yet licensed for this record.

Petzval refractorCamera onlyOTA only

William Optics RedCat 51

Aperture
51 mm (2")
Focal length
250 mm (9.8")
Focal ratio
f/4.9

A tiny, expensive, almost foolproof wide-field astrograph. You are paying for the fact that nothing about the optical train can go wrong.