Eyepiece and telescope pairing
Best eyepiece for the Celestron Astro Fi 130
Which eyepiece gets the most out of the Celestron Astro Fi 130, chosen by exit pupil rather than by guesswork.
- Aperture / focal length
- 130 mm / 650 mm (f/5)
- Deep-sky pick
- Tele Vue 10mm Delos: 65x, 2 mm exit pupil
- Low-power pick
- Celestron X-Cel LX 25mm: 26x, 5 mm exit pupil
- Focuser barrel
- 1.25 in (both eyepieces fit)
For deep-sky detail, the Tele Vue 10mm Delos is the pick of the eyepieces here: at 65x it lands near the 2 mm exit pupil where faint-object contrast peaks in the Celestron Astro Fi 130. For wide low-power sweeping, drop to the Celestron X-Cel LX 25mm at 26x.
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 Astro Fi 130 the Tele Vue 10mm Delos lands there, at 65x with a 2 mm exit pupil and a 1.11 degree field.
For a low-power finder-and-framing view you want a wider exit pupil, around 5 mm. Here the Celestron X-Cel LX 25mm gives 26x, a 5 mm exit pupil and a 2.31 degree field, the widest true field of the eyepieces that fit this focuser.