A Tele Vue 7mm Nagler Type 6 in the Celestron NexStar 5SE gives 179x, a 0.46 degree true field and a 0.7 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 7mm Nagler Type 6 in the Celestron NexStar 5SE: magnification and field

What the Tele Vue 7mm Nagler Type 6 does in the Celestron NexStar 5SE, worked from the published focal lengths and apparent field.

Field of view

ring = 0.46 degrees true
dot = 0.7 mm exit pupil

Computed optics

Magnification
179x1250 mm / 7 mm
True field
0.46 degrees82 deg / 179x
Exit pupil
0.7 mm125 mm / 179x
Max useful mag
295xpublished
Barrel match
1.25 in eyepiece in a 1.25 in focuser
Fits

Good fit. In the Celestron NexStar 5SE the Tele Vue 7mm Nagler Type 6 gives 179x with a 0.46 degree true field and a 0.7 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 1250 mm divided by 7 mm is 179x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 0.46 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 125 mm over 179x, which is 0.7 mm. That makes this a high-power lunar, planetary and double-star setting.

The eyepiece to buy

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Related

Celestron NexStar 5SE125 mm f/10
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Best eyepiece for the Celestron NexStar 5SEexit-pupil match

Questions and answers

Tele Vue 7mm Nagler Type 6 in the Celestron NexStar 5SE: magnification and field?

Good fit. In the Celestron NexStar 5SE the Tele Vue 7mm Nagler Type 6 gives 179x with a 0.46 degree true field and a 0.7 mm exit pupil, inside the telescope's useful range.