What it shows
Through the family's typical instrument: 115 mm at f/13.4, with the eyepiece a beginner would use for each target. Computed, then darkened by the sky — never a photograph.
- The MoonDetailed62× (25 mm eyepiece) · 115 mm · 1.9 mm exit pupil
- SaturnDetailed103× (15 mm eyepiece) · 115 mm · 1.1 mm exit pupil
- The Hercules ClusterRecognisable77× (20 mm eyepiece) · 115 mm · 1.5 mm exit pupil
- The Whirlpool GalaxyDetectable48× (32 mm eyepiece) · 115 mm · 2.4 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 & planets5/5 ExcellentThis is what the design is for. Sharp, high-contrast, and long enough to reach 250× on 127 mm (an exit pupil of 0.5 mm) without effort.
- Sun4/5 GoodIn white light: sunspots with their penumbra, faculae near the edge, and granulation on a steady morning. Dawes' limit on the Sun: 1.1″ (116 ÷ 102 mm, arithmetic). The cell has to hold each model's own outside diameter, so it depends on the model: from €69 for the smallest (102 mm) to €79 for the largest (127 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.
- Travel3/5 FairThe tube travels beautifully; the mount and tripod less so.
- Deep sky2/5 WeakModest aperture and a narrow field. Globulars are fine; large nebulae are not.
Not for this
- Learn the sky1/5 PoorGoTo does the part you said you wanted to learn.
Not scored: With a child, Photo, Serious photo.
What it does well
- Long focal length gives high magnification with ordinary eyepieces — ideal for planets and double stars
- Small enough to live on a shelf
- GoTo finds things a city sky hides, which is exactly where it is needed
What it costs you
- A narrow field of view. Some large objects will not fit in it at all
- Takes 30–45 minutes to cool before it performs
- The mount needs power and an alignment routine, in the dark, in the cold
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 €69 for the smallest (102 mm) to €79 for the largest (127 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: 1.1″ (116 ÷ 102 mm, arithmetic).
- 102 mm, 117.5 mm outside: Omegon Helievo 112 (104–128 mm), €69.
- 127 mm, 146.05 mm outside: Omegon Helievo 132 (124–148 mm), €79.
The listing names no standard; no international standard exists for filters on telescopes, binoculars or lenses (AAS).
Counted against this family: €69, 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
76 mm tabletop Newtonian- −39 mm
- −7 kg
- −€370 at entry level
Recognisable targets (of 14): countryside 13 → 10, city 8 → 7.
Same budget, another way
72–80 mm ED refractor- −39 mm
- −4 kg
- −€50 at entry level
Recognisable targets (of 14): countryside 13 → 10, city 8 → 7.
Bigger
150–200 mm Schmidt-Cassegrain on a GoTo alt-az- +62 mm
- +5 kg
- +€450 at entry level
Recognisable targets (of 14): countryside 13 → 14, city 8 → 11.
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 Skymax 102 AZ-GTi | 102 mm | 1300 mm | 7.5 kg | 25 mm and 10 mm | €629seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
 Sky-Watcher Skymax 127 AZ-GTi | 127 mm | 1500 mm | 8.5 kg | 25 mm and 10 mm | €709seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
 Celestron NexStar 127 SLT | 127 mm | 1500 mm | 8.2 kg | 25 mm and 9 mm | €869seen 7 Oct 2026 at Astroshop | At Astroshoppaid link4 other sellers
|
Questions people ask
Maksutov 102 or 127?
The 127 gathers (127 ÷ 102)² ≈ 1.55 times the light and resolves 0.91″ against 1.14″. On the planets that difference shows; the 102 keeps the edge in weight and cool-down time.
Is a Maksutov good in a city?
One of the best choices: the Moon and planets ignore light pollution, the short tube lives on a shelf and works on a balcony, and GoTo finds what a city sky hides.
Why is the view poor for the first half hour?
The closed tube and thick meniscus take 30–45 minutes to reach the night's temperature. Until then, high-power views boil. Put it out before dinner.
Can it show nebulae?
Globular clusters and small planetary nebulae, yes. Big objects, no: with over 1,300 mm of focal length, the widest field a 32 mm eyepiece gives is barely more than a degree — the Pleiades do not fit.
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
- Refractor or reflector for a first telescope?For the same money a reflector gives two to three times the aperture. When that decides, and the two cases where it does not.Updated 30 Aug 2026