What it shows
Through the family's typical instrument: 140 mm at f/5.0, with the eyepiece a beginner would use for each target. Computed, then darkened by the sky — never a photograph.
- The MoonDetailed69× (10 mm eyepiece) · 140 mm · 2.0 mm exit pupil
- SaturnDetailed139× (5 mm eyepiece) · 140 mm · 1.0 mm exit pupil
- The Hercules ClusterRecognisable87× (8 mm eyepiece) · 140 mm · 1.6 mm exit pupil
- The Whirlpool GalaxyRecognisable46× (15 mm eyepiece) · 140 mm · 3.0 mm exit pupil
Photo credits
These thumbnails are built from real photographs, scaled and darkened by the same arithmetic as the large view.
Which level of detail a target reaches is a rule of thumb from observers; the magnification, field and exit pupil are arithmetic.
What it is for, goal by goal
Every score with the sentence behind it, highest first.
- Moon & planets4/5 Good130–150 mm, and the mount tracks: Saturn stays in the field at 150× on 150 mm (exit pupil 1 mm) instead of drifting out in under a minute (arithmetic, with a 50° eyepiece). Dawes' limit is 0.77″ on 150 mm (116 ÷ 150, arithmetic). The eyepieces in these kits stop at 65–75× on 130–150 mm (an exit pupil of 2 mm); more needs one bought separately.
- Sun4/5 GoodIn white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 0.9″ (116 ÷ 130 mm, arithmetic). The cell has to hold each model's own outside diameter, so it depends on the model: from €79 for the smallest (130 mm) to €125 for the largest (150 mm). Each model's page names its own. Every time: certified filter over the front · finder capped · never an eyepiece filter · an adult with children · never without the filter · measure first.
- Deep sky3/5 FairThe brighter half of the Messier list from a decent sky, and the GoTo finds them where a town sky hides the stars you would hop from. It adds no light: 130–150 mm shows what 130–150 mm shows.
- With a child3/5 FairTracking keeps the planet in the eyepiece while a queue of children takes turns, which no manual mount does. An adult runs the alignment and the app, and a Newtonian's eyepiece moves as the tube points.
- Travel2/5 WeakA car trip: tube, mount head, tripod, batteries and a phone. Hand luggage, no.
Not for this
- Learn the sky1/5 PoorThe GoTo does the part you said you wanted to learn. The app names what is up; it does not teach you to find it.
- Photo1/5 PoorA phone at the eyepiece on the Moon, and short planetary videos, which tracking makes easier. Not long exposures: an alt-az mount rotates the field during the exposure, and these small mounts are not built to carry a camera (experience).
- Serious photo0/5 NoNo. Field rotation and a mount rated for about 5 kg rule out long exposures.
What it does well
- Finds objects a town sky hides, and tracks them: a planet stays in the field at high power, and while others take turns
- Real aperture at the eyepiece — a 150 mm gathers (150 ÷ 7)² ≈ 460 times the light of a dark-adapted 7 mm pupil, arithmetic
- A standard dovetail: the tube and the mount can each be replaced later without the other
What it costs you
- Batteries — usually eight AA cells — and an alignment on one or two stars at the start of every night
- On most of these kits the phone is the hand controller: a flat phone battery ends the night
- Small mounts rated for about 5 kg: a 150 mm tube is near that limit, and at high power the view settles slowly after a touch (experience)
The Sun, safely
The Sun with this family
The cell has to hold each model's own outside diameter, so it depends on the model: from €79 for the smallest (130 mm) to €125 for the largest (150 mm). Each model's page names its own.
In white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 0.9″ (116 ÷ 130 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).
- 130 mm: outside diameter not sourced — once measured, one of: Omegon Helievo 132 (124–148 mm), Omegon Helievo 152 (144–168 mm), Omegon Helievo 172 (164–188 mm) (€79–€99).
- 150 mm: outside diameter not sourced — once measured, 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).
The listing names no standard; no international standard exists for filters on telescopes, binoculars or lenses (AAS).
Counted against this family: €99, the filter for its smallest model — its cheapest route, where its price band starts.
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
Next to it
Smaller
114–130 mm Newtonian on a manual equatorial mount- −18 mm
- +1 kg
- −€170 at entry level
Recognisable targets (of 14): countryside 14 → 14, city 10 → 8.
Same budget, another way
102–127 mm Maksutov on a GoTo alt-az- −25 mm
- ±0 kg
- −€20 at entry level
Recognisable targets (of 14): countryside 14 → 13, city 10 → 8.
Bigger
150–200 mm Dobsonian- +35 mm
- +11 kg
- −€140 at entry level
Recognisable targets (of 14): countryside 14 → 14, city 10 → 10.
Rule of thumb from observers, at each family's typical aperture.
The models
Each price is the cheapest one observed, with its date. Links marked paid link earn us a commission and cost you nothing extra; the list is ordered by price, then by name — never by what pays. How this site is funded
| Model | Aperture | Focal length | Weight | Eyepieces supplied | Cheapest observed | Buy |
|---|---|---|---|---|---|---|
 Sky-Watcher Explorer-130P AZ-Go2 | 130 mm | 650 mm | — | 25 mm and 10 mm | €441seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
 Sky-Watcher Heritage 150P FlexTube Virtuoso GTi | 150 mm | 750 mm | 9 kg | 25 mm and 10 mm | €482seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
 Sky-Watcher Explorer-130PS AZ-GTi | 130 mm | 650 mm | 6.7 kg | 25 mm and 10 mm | €595seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
 Sky-Watcher Star Discovery P150i Wi-Fi GoTo | 150 mm | 750 mm | — | 25 mm and 10 mm | €715seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
Questions people ask
A GoTo or a Dobsonian for the same budget?
For the same budget, the Dobsonian gives more aperture: a 200 mm gathers (200 ÷ 150)² ≈ 1.8 times the light of a 150 mm. The GoTo finds and tracks objects, which matters in a town, on a balcony or when sharing a view; it needs batteries and an alignment every night.
Do I need a phone?
On most of these mounts, yes: the SynScan app, over Wi-Fi, replaces the hand controller, which is absent or sold separately. A charged phone and a spare battery are part of the kit.
How does the alignment work?
Level the tripod, point the tube in a starting direction, then centre one or two bright stars the app suggests. From experience, five to ten minutes the first few times, less after that. Move the tripod and you start again.
And for learning the sky?
The GoTo does exactly the part you wanted to learn: the app names what is up, it does not teach you to find it. For someone who wants to see without searching, it is the right tool; for someone who wants to find their way, binoculars and a chart first.
Read next
- Do you need a GoTo mount for a first telescope?At €500 the motor replaces half the mirror. Who that is a bad trade for, and the three people it is right for.Updated 30 Aug 2026
- Which telescope should a beginner buy?The short answer, the three things the box does not say, then the detail by budget and by situation.Updated 24 Sept 2026