Eyepiece and telescope pairing
Celestron Omni 9mm Plossl in the Celestron StarSense Explorer LT 80AZ: magnification and field
What the Celestron Omni 9mm Plossl does in the Celestron StarSense Explorer LT 80AZ, worked from the published focal lengths and apparent field.
Field of view
ring = 0.5 degrees true
dot = 0.8 mm exit pupil
- Magnification
- 100x900 mm / 9 mm
- True field
- 0.5 degrees50 deg / 100x
- Exit pupil
- 0.8 mm80 mm / 100x
- 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 Omni 9mm Plossl gives 100x with a 0.5 degree true field and a 0.8 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 9 mm is 100x. The true field of view is the eyepiece's 50 degree apparent field divided by that magnification, 0.5 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 80 mm over 100x, which is 0.8 mm. That makes this a high-power lunar, planetary and double-star setting.
The eyepiece to buy
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