Eyepiece and telescope pairing
Explore Scientific 14mm 82 Degree in the Celestron NexStar Evolution 8: magnification and field
What the Explore Scientific 14mm 82 Degree does in the Celestron NexStar Evolution 8, worked from the published focal lengths and apparent field.
Field of view
ring = 0.56 degrees true
dot = 1.4 mm exit pupil
- Magnification
- 145x2032 mm / 14 mm
- True field
- 0.56 degrees82 deg / 145x
- Exit pupil
- 1.4 mm203 mm / 145x
- Max useful mag
- 480xpublished
Computed optics
- Barrel match
- 1.25 in eyepiece in a 2 in focuser
Good fit. In the Celestron NexStar Evolution 8 the Explore Scientific 14mm 82 Degree gives 145x with a 0.56 degree true field and a 1.4 mm exit pupil, inside the telescope's useful range.
Magnification is the telescope focal length divided by the eyepiece focal length: 2032 mm divided by 14 mm is 145x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 0.56 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 203 mm over 145x, which is 1.4 mm. That makes this a high-power lunar, planetary and double-star setting.
The eyepiece to buy
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