Eyepiece and telescope pairing
Celestron X-Cel LX 25mm in the Celestron C6 optical tube: magnification and field
What the Celestron X-Cel LX 25mm does in the Celestron C6 optical tube, worked from the published focal lengths and apparent field.
Field of view
ring = 1 degrees true
dot = 2.5 mm exit pupil
- Magnification
- 60x1500 mm / 25 mm
- True field
- 1 degrees60 deg / 60x
- Exit pupil
- 2.5 mm150 mm / 60x
- Max useful mag
- 354xpublished
Computed optics
- Barrel match
- 1.25 in eyepiece in a 1.25 in focuser
Good fit. In the Celestron C6 optical tube the Celestron X-Cel LX 25mm gives 60x with a 1 degree true field and a 2.5 mm exit pupil, inside the telescope's useful range.
Magnification is the telescope focal length divided by the eyepiece focal length: 1500 mm divided by 25 mm is 60x. The true field of view is the eyepiece's 60 degree apparent field divided by that magnification, 1 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 150 mm over 60x, which is 2.5 mm. That makes this a medium-power general setting.
The eyepiece to buy
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