Eyepiece and telescope pairing
Explore Scientific 30mm 82 Degree in the Celestron NexStar 6SE: magnification and field
What the Explore Scientific 30mm 82 Degree does in the Celestron NexStar 6SE, worked from the published focal lengths and apparent field.
Field of view
ring = 1.64 degrees true
dot = 3 mm exit pupil
- Magnification
- 50x1500 mm / 30 mm
- True field
- 1.64 degrees82 deg / 50x
- Exit pupil
- 3 mm150 mm / 50x
- Max useful mag
- 354xpublished
Computed optics
- Barrel match
- 2 in eyepiece in a 2 in focuser
Good fit. In the Celestron NexStar 6SE the Explore Scientific 30mm 82 Degree gives 50x with a 1.64 degree true field and a 3 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 30 mm is 50x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 1.64 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 150 mm over 50x, which is 3 mm. That makes this a medium-power general setting.
The eyepiece to buy
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