Sky-Watcher Heritage 150P FlexTube
A short Newtonian on a small rocker box that sits on a table, a wall or a crate. The best value in astronomy at the moment, and the answer to more first-telescope questions than anything else here.
€345seen 7 Oct 2026 at Astroshop
- 150 mmAperture
- f/5.0Focal ratio
- 7.5 kgTypical weight
- 25–300×Useful magnification
Should you buy it?
- Yes if what you mainly want is sharing it with children, the moon and the planets, learn my way around the sky: that is what this family does best.
Computed from its family's per-goal scores and its own numbers — not a rating, not one evening's opinion.
Where to buy
Also search at First Light Optics · Optique Unterlinden · Pierro Astro · Teleskop-Express (searches; neither price nor stock checked)
1 of these 5 links earn us a commission, marked above. Sorted by price, never by what pays. How this site is funded.
Prices are observed on the date shown, never live. Links marked paid link earn us a commission and cost you nothing extra.
What it shows, really
These circles are simulations, computed from the aperture, the magnification and the sky — indicative, not exact. A real night also depends on the turbulence, your eyes and your experience. Closer to the truth than the photo on the box; still not a promise.
Under a suburban sky (Bortle 6), through a common 25 mm eyepiece for wide targets and a 10 mm for planets. Every circle is the true field — nothing is enlarged.
Photo credits
These thumbnails are built from real photographs, scaled and darkened by the same arithmetic as the large view.
The numbers
Photo: Astroshop| Aperture | 150 mm |
|---|---|
| Focal ratio | 750 mm · f/5.0 |
| Mount | Tabletop Dobsonian base, collapsible tube |
| Typical weight | 7.5 kg |
| Eyepieces | 25 mm and 10 mm |
| Useful magnification | 25× to 300× at 150 mm |
| Resolution (Dawes) | 0.8″ — the tightest double star this aperture can split |
| Faintest star, suburban sky | around magnitude 12.2 |
| Observed price | €345 seen 7 Oct 2026 at Astroshop |
Made for
- Sharing it with children
On a garden table it sits at a child's eye level, and they can move it themselves.
- The Moon and the planets
Sharp on the Moon, and Saturn's rings are unmistakable at 130× on 130 mm (an exit pupil of 1 mm). Jupiter shows two belts and four moons.
- Learn my way around the sky
Fast enough to point that star-hopping stays fun.
- The Sun
In white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 0.8″ (116 ÷ 150 mm, arithmetic). Measure the outside diameter first, then one of: Omegon Helievo 152 (144–168 mm), Omegon Helievo 172 (164–188 mm), Omegon Helievo 192 (184–208 mm), euro EMC SF100 (187–221 mm) (€89–€125). Every time: certified filter over the front · finder capped · never an eyepiece filter · an adult with children · never without the filter · measure first.
The Sun, safely
No solar filter in the box
The Sun with this model
No source we have states the outside diameter of its tube or dew shield. Measure it at the front, then take the cell whose range holds it. For 150 mm of aperture, one of these:
In white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 0.8″ (116 ÷ 150 mm, arithmetic).
Past about 100 to 125 mm, daytime air rather than aperture generally sets the limit on the Sun (experience: the AAVSO solar observing guide).
- Omegon Helievo 152 (144–168 mm): holds 144–168 mm, €89 (seen 26 Sept 2026) Astroshoppaid link
- Omegon Helievo 172 (164–188 mm): holds 164–188 mm, €99 (seen 26 Sept 2026) Astroshoppaid link
- Omegon Helievo 192 (184–208 mm): holds 184–208 mm, €109 (seen 26 Sept 2026) Astroshoppaid link
- euro EMC SF100 (187–221 mm): holds 187–221 mm, €125 (seen 26 Sept 2026) Astroshoppaid link
The listing names no standard; no international standard exists for filters on telescopes, binoculars or lenses (AAS).
Every time
- A certified solar filter over the FRONT of the instrument, fastened so it cannot slip or blow off.
- Cap or remove the finder. It is a second telescope, and it has no filter.
- Never a filter at the eyepiece end: the concentrated sunlight there can crack it in an instant.
- With children, an adult is there every time.
- Never look, or point, without the filter on. Check it before each use; a scratched or torn filter goes in the bin.
- Measure before ordering. A cell that sits loose can fall off.
Sources for the Sun
- American Astronomical Society — How to View a Solar Eclipse Safely — filters on optics go on the front; eclipse glasses never with optics; children supervised
- American Astronomical Society — Solar Filters for Optics — eyepiece filters are dangerous; the finder capped, removed or filtered; the filter attached securely
- American Astronomical Society — About the ISO 12312-2 Standard — EN ISO 12312-2:2015 covers naked-eye viewers only; no international standard covers filters on telescopes, binoculars or lenses
- Société astronomique de France — Guide des observations solaires — a filter at the front, never one screwed into the eyepiece, the finder capped
- NASA — Keep Your Eclipse Glasses to See the Sun's ‘Freckles’ — a large enough sunspot shows through eclipse glasses
- AAVSO — Le Guide d'Observation Solaire de l'AAVSO, v1.1 (2017), p. 6 — archived copy — “Les ouvertures plus grandes que 100 à 125 mm sont généralement limitées par les effets de turbulence atmosphérique”; 50 to 80 mm is enough to count sunspots
The family it belongs to: 130 mm tabletop Dobsonian
What it does well
- Real aperture — several hundred times the light of an unaided eye — at a price that does not need justifying
- Carried outside in one hand, set up in a couple of minutes
- Nothing to align, nothing to power, nothing to fight in the dark
What it costs you
- Needs a table or a wall. On the ground you are lying down
- Needs collimating occasionally — five minutes with a €20 cap
- The supplied eyepieces are usually adequate rather than good
Worth knowing about this model
The Heritage 130P's big brother: 150 mm on the same tabletop base, 7.5 kg. As much light as the floor-standing 150/1200 in a third of the length, at f/5 — which means the coma at the edge is real and the collimation matters more. Needs a sturdier table than the 130.
Same family, other sizes
Compare it
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€345seen 7 Oct 2026 at Astroshop
Where to buy