Sky-Watcher Evostar 100ED vs Sky-Watcher Evostar 120: specs compared
Updated 05 September 2026.
120 mm
Sky-Watcher Evostar 120 wins on aperture
On aperture, Sky-Watcher Evostar 120 leads: 120 mm versus 100 mm.
| Spec | Sky-Watcher Evostar 100ED | Sky-Watcher Evostar 120 |
|---|---|---|
| Aperture | 100 mm (3.94 in) | 120 mm (4.72 in) |
| Focal length | 900 mm | 1000 mm |
| Focal ratio | f/9 | f/8.3 |
| Optical design | ED doublet apochromatic refractor | Achromatic refractor |
| Focuser / eyepiece barrel | 2 in dual-speed Crayford focuser with a 1.25 in adapter | 2 in dual-speed Crayford focuser with a 1.25 in adapter |
| Mount | Optical tube (Vixen dovetail), no mount supplied | Optical tube (Vixen dovetail), no mount supplied |
| Highest useful magnification (published) | 236x | 283x |
Questions and answers
Which has the higher aperture, Sky-Watcher Evostar 100ED or Sky-Watcher Evostar 120?
On aperture, Sky-Watcher Evostar 120 leads: 120 mm versus 100 mm.
How do Sky-Watcher Evostar 100ED and Sky-Watcher Evostar 120 compare?
On aperture, Sky-Watcher Evostar 120 leads: 120 mm versus 100 mm.