Eyepiece and telescope pairing
Explore Scientific 14mm 82 Degree in the Celestron Omni XLT 120: magnification and field
What the Explore Scientific 14mm 82 Degree does in the Celestron Omni XLT 120, worked from the published focal lengths and apparent field.
Field of view
ring = 1.15 degrees true
dot = 1.7 mm exit pupil
- Magnification
- 71x1000 mm / 14 mm
- True field
- 1.15 degrees82 deg / 71x
- Exit pupil
- 1.7 mm120 mm / 71x
- Max useful mag
- 283xpublished
Computed optics
- Barrel match
- 1.25 in eyepiece in a 2 in focuser
Good fit. In the Celestron Omni XLT 120 the Explore Scientific 14mm 82 Degree gives 71x with a 1.15 degree true field and a 1.7 mm exit pupil, inside the telescope's useful range.
Magnification is the telescope focal length divided by the eyepiece focal length: 1000 mm divided by 14 mm is 71x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 1.15 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 120 mm over 71x, which is 1.7 mm. That makes this a medium-power general setting.
The eyepiece to buy
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