Eyepiece and telescope pairing
Celestron X-Cel LX 25mm in the Celestron StarSense Explorer LT 80AZ: magnification and field
What the Celestron X-Cel LX 25mm does in the Celestron StarSense Explorer LT 80AZ, worked from the published focal lengths and apparent field.
Field of view
ring = 1.67 degrees true
dot = 2.2 mm exit pupil
- Magnification
- 36x900 mm / 25 mm
- True field
- 1.67 degrees60 deg / 36x
- Exit pupil
- 2.2 mm80 mm / 36x
- Max useful mag
- 189xpublished
Computed optics
- Barrel match
- 1.25 in eyepiece in a 1.25 in focuser
Good fit. In the Celestron StarSense Explorer LT 80AZ the Celestron X-Cel LX 25mm gives 36x with a 1.67 degree true field and a 2.2 mm exit pupil, inside the telescope's useful range.
Magnification is the telescope focal length divided by the eyepiece focal length: 900 mm divided by 25 mm is 36x. The true field of view is the eyepiece's 60 degree apparent field divided by that magnification, 1.67 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 80 mm over 36x, which is 2.2 mm. That makes this a medium-power general setting.
The eyepiece to buy
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