Bresser Messier 150/750 Dobson
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.
€349seen 7 Oct 2026 at Astroshop
- 150 mmAperture
- f/5.0Focal ratio
- 9.2 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 |
| Typical weight | 9.2 kg |
| Eyepieces | 25 mm and 9 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 | €349 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). It needs a certified cell over the front whose range holds its 180 mm outside diameter: the Omegon Helievo 172 (164–188 mm), €99 (seen 26 Sept 2026). 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
It needs a certified cell over the front whose range holds its 180 mm outside diameter: the Omegon Helievo 172 (164–188 mm), €99 (seen 26 Sept 2026).
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).
The listing gives a fit of 164–188 mm across the outside of the tube. Clear aperture 172 mm. The listing names no standard; no international standard exists for filters on telescopes, binoculars or lenses (AAS).
Where to buy
1 of these 1 links earn us a commission, marked above. Sorted by price, never by what pays. How this site is funded.
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
9.2 kg in all, of which the tube is 4.7 kg and 685 mm long: it needs a sturdier table than the 130s. At f/5 the coma at the edge of the field is real and the collimation matters. The 9 mm eyepiece in the box gives 83× on 150 mm, an exit pupil of 1.8 mm; the 25 mm gives 30×, an exit pupil of 5 mm.
Same family, other sizes
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€349seen 7 Oct 2026 at Astroshop
Where to buy