Two models, the numbers decide

Sky-Watcher Skymax 102 AZ-GTi or Sky-Watcher Skymax 127 AZ-GTi?

Sky-Watcher Skymax 102 AZ-GTi — 102 mm, €629. Sky-Watcher Skymax 127 AZ-GTi — 127 mm, €709. The same method as everywhere on this site: the numbers first, the verdict from them.

Same family (102–127 mm Maksutov on a GoTo alt-az): what changes between these two is aperture, bulk and price — not character.

102–127 mm Maksutov on a GoTo alt-az

Sky-Watcher Skymax 102 AZ-GTi

Saturn at 100× in 102 mm — exit pupil 1.0 mm, Bortle 6 sky. Computed, not photographed.

€629seen 7 Oct 2026 at Astroshop

See it at Astroshoppaid linkAll the sellers

102–127 mm Maksutov on a GoTo alt-az

Sky-Watcher Skymax 127 AZ-GTi

Saturn at 125× in 127 mm — exit pupil 1.0 mm, Bortle 6 sky. Computed, not photographed.

€709seen 7 Oct 2026 at Astroshop

See it at Astroshoppaid linkAll the sellers

Side by side

The Sky-Watcher Skymax 127 AZ-GTi collects 1.6× more light — that is what aperture buys.

	Sky-Watcher Skymax 102 AZ-GTi	Sky-Watcher Skymax 127 AZ-GTi
Aperture	102 mm	127 mm
Focal ratio	1300 mm · f/12.7	1500 mm · f/11.8
Typical weight	7.5 kg	8.5 kg
Setup time	12 minutes	12 minutes
Learning curve	3 out of 5	3 out of 5
Useful magnification	≤ 204×	≤ 254×
Resolution (Dawes)	1.1″	0.9″
Observed price	€629seen 7 Oct 2026 at Astroshop	€709seen 7 Oct 2026 at Astroshop
Where to buy	See it at Astroshop paid link	See it at Astroshop paid link

Choose the Sky-Watcher Skymax 102 AZ-GTi if…

budget decides: €80 less
it has to be carried: 1 kg lighter

Full page on the Skymax 102 AZ-GTi →

Where to buy

Astroshoppaid link€629seen 7 Oct 2026→ships DE, FR, EU

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.

Choose the Sky-Watcher Skymax 127 AZ-GTi if…

you want the most sky: 1.6× the light

Full page on the Skymax 127 AZ-GTi →

Where to buy

Astroshoppaid link€709seen 7 Oct 2026→ships DE, FR, EU

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.

The same sky, through both

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.

The Moon

Skymax 102 AZ-GTi · Detailed

Skymax 127 AZ-GTi · Detailed

Saturn

Skymax 102 AZ-GTi · Detailed

Skymax 127 AZ-GTi · Detailed

The Orion Nebula

Skymax 102 AZ-GTi · Recognisable

Skymax 127 AZ-GTi · Recognisable

The Andromeda Galaxy

Skymax 102 AZ-GTi · Recognisable

Skymax 127 AZ-GTi · Recognisable

Photo credits

These thumbnails are built from real photographs, scaled and darkened by the same arithmetic as the large view.

The Moon: NASA Scientific Visualization Studio / LRO, public domain
The Orion Nebula: NASA, ESA, M. Robberto (heic0601a), CC BY 4.0
The Andromeda Galaxy: Adam Evans, Wikimedia Commons, CC BY 2.0