Eyepiece and telescope pairing
Tele Vue 6mm Ethos in the Celestron NexStar 6SE: magnification and field
What the Tele Vue 6mm Ethos does in the Celestron NexStar 6SE, worked from the published focal lengths and apparent field.
Field of view
ring = 0.4 degrees true
dot = 0.6 mm exit pupil
- Magnification
- 250x1500 mm / 6 mm
- True field
- 0.4 degrees100 deg / 250x
- Exit pupil
- 0.6 mm150 mm / 250x
- Max useful mag
- 354xpublished
Computed optics
- Barrel match
- 1.25 in eyepiece in a 2 in focuser
Good fit. In the Celestron NexStar 6SE the Tele Vue 6mm Ethos gives 250x with a 0.4 degree true field and a 0.6 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 6 mm is 250x. The true field of view is the eyepiece's 100 degree apparent field divided by that magnification, 0.4 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 150 mm over 250x, which is 0.6 mm. That makes this a high-power lunar, planetary and double-star setting.
The eyepiece to buy
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