Eyepiece and telescope pairing
Best eyepiece for the Celestron NexStar 4SE
Which eyepiece gets the most out of the Celestron NexStar 4SE, chosen by exit pupil rather than by guesswork.
- Aperture / focal length
- 102 mm / 1325 mm (f/13)
- Deep-sky pick
- Celestron X-Cel LX 25mm: 53x, 1.92 mm exit pupil
- Low-power pick
- Celestron Omni 40mm Plossl: 33x, 3.08 mm exit pupil
- Focuser barrel
- 1.25 in (both eyepieces fit)
For deep-sky detail, the Celestron X-Cel LX 25mm is the pick of the eyepieces here: at 53x it lands near the 2 mm exit pupil where faint-object contrast peaks in the Celestron NexStar 4SE. For wide low-power sweeping, drop to the Celestron Omni 40mm Plossl at 33x.
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 4SE the Celestron X-Cel LX 25mm lands there, at 53x with a 1.92 mm exit pupil and a 1.13 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 33x, a 3.08 mm exit pupil and a 1.21 degree field, the widest true field of the eyepieces that fit this focuser.
Eyepieces to buy
Search Amazon for Celestron X-Cel LX 25mmaffiliate searchFind Celestron X-Cel LX 25mm on eBayaffiliateSearch Amazon for Celestron Omni 40mm Plosslaffiliate searchFind Celestron Omni 40mm Plossl on eBayaffiliate