Eyepiece and telescope pairing
Best eyepiece for the Celestron NexStar 5SE
Which eyepiece gets the most out of the Celestron NexStar 5SE, chosen by exit pupil rather than by guesswork.
- Aperture / focal length
- 125 mm / 1250 mm (f/10)
- Deep-sky pick
- Celestron Omni 15mm Plossl: 83x, 1.5 mm exit pupil
- Low-power pick
- Celestron Omni 40mm Plossl: 31x, 4 mm exit pupil
- Focuser barrel
- 1.25 in (both eyepieces fit)
For deep-sky detail, the Celestron Omni 15mm Plossl is the pick of the eyepieces here: at 83x it lands near the 2 mm exit pupil where faint-object contrast peaks in the Celestron NexStar 5SE. For wide low-power sweeping, drop to the Celestron Omni 40mm Plossl at 31x.
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 Celestron NexStar 5SE the Celestron Omni 15mm Plossl lands there, at 83x with a 1.5 mm exit pupil and a 0.6 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 31x, a 4 mm exit pupil and a 1.28 degree field, the widest true field of the eyepieces that fit this focuser.
Eyepieces to buy
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