A Tele Vue 13mm Nagler Type 6 in the Celestron StarSense Explorer LT 80AZ gives 69x, a 1.18 degree true field and a 1.2 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 13mm Nagler Type 6 in the Celestron StarSense Explorer LT 80AZ: magnification and field

What the Tele Vue 13mm Nagler Type 6 does in the Celestron StarSense Explorer LT 80AZ, worked from the published focal lengths and apparent field.

Field of view

ring = 1.18 degrees true
dot = 1.2 mm exit pupil

Computed optics

Magnification
69x900 mm / 13 mm
True field
1.18 degrees82 deg / 69x
Exit pupil
1.2 mm80 mm / 69x
Max useful mag
189xpublished
Barrel match
1.25 in eyepiece in a 1.25 in focuser
Fits

Good fit. In the Celestron StarSense Explorer LT 80AZ the Tele Vue 13mm Nagler Type 6 gives 69x with a 1.18 degree true field and a 1.2 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 13 mm is 69x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 1.18 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 80 mm over 69x, which is 1.2 mm. That makes this a high-power lunar, planetary and double-star setting.

The eyepiece to buy

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Related

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Questions and answers

Tele Vue 13mm Nagler Type 6 in the Celestron StarSense Explorer LT 80AZ: magnification and field?

Good fit. In the Celestron StarSense Explorer LT 80AZ the Tele Vue 13mm Nagler Type 6 gives 69x with a 1.18 degree true field and a 1.2 mm exit pupil, inside the telescope's useful range.