Eyepiece and telescope pairing
Best eyepiece for the Sky-Watcher Evostar 100ED
Which eyepiece gets the most out of the Sky-Watcher Evostar 100ED, chosen by exit pupil rather than by guesswork.
- Aperture / focal length
- 100 mm / 900 mm (f/9)
- Deep-sky pick
- Celestron X-Cel LX 18mm: 50x, 2 mm exit pupil
- Low-power pick
- Tele Vue 41mm Panoptic: 22x, 4.56 mm exit pupil
- Focuser barrel
- 2 in (both eyepieces fit)
For deep-sky detail, the Celestron X-Cel LX 18mm is the pick of the eyepieces here: at 50x it lands near the 2 mm exit pupil where faint-object contrast peaks in the Sky-Watcher Evostar 100ED. For wide low-power sweeping, drop to the Tele Vue 41mm Panoptic at 22x.
An exit pupil near 2 mm is the classic sweet spot for teasing detail out of faint deep-sky objects, because it concentrates the light while keeping the image bright enough. In the Sky-Watcher Evostar 100ED the Celestron X-Cel LX 18mm lands there, at 50x with a 2 mm exit pupil and a 1.2 degree field.
For a low-power finder-and-framing view you want a wider exit pupil, around 5 mm. Here the Tele Vue 41mm Panoptic gives 22x, a 4.56 mm exit pupil and a 3.1 degree field, the widest true field of the eyepieces that fit this focuser.