Eyepiece and telescope pairing
Best eyepiece for the Sky-Watcher Evostar 80ED
Which eyepiece gets the most out of the Sky-Watcher Evostar 80ED, chosen by exit pupil rather than by guesswork.
- Aperture / focal length
- 80 mm / 600 mm (f/7.5)
- Deep-sky pick
- Celestron Omni 15mm Plossl: 40x, 2 mm exit pupil
- Low-power pick
- Celestron Omni 40mm Plossl: 15x, 5.33 mm exit pupil
- Focuser barrel
- 2 in (both eyepieces fit)
For deep-sky detail, the Celestron Omni 15mm Plossl is the pick of the eyepieces here: at 40x it lands near the 2 mm exit pupil where faint-object contrast peaks in the Sky-Watcher Evostar 80ED. For wide low-power sweeping, drop to the Celestron Omni 40mm Plossl at 15x.
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 80ED the Celestron Omni 15mm Plossl lands there, at 40x with a 2 mm exit pupil and a 1.25 degree field.
For a low-power finder-and-framing view you want a wider exit pupil, around 5 mm. Here the Celestron Omni 40mm Plossl gives 15x, a 5.33 mm exit pupil and a 2.67 degree field, the widest true field of the eyepieces that fit this focuser.