A Tele Vue 10mm Ethos in the Celestron StarSense Explorer DX 102AZ gives 66x, a 1.52 degree true field and a 1.5 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 10mm Ethos in the Celestron StarSense Explorer DX 102AZ: magnification and field

What the Tele Vue 10mm Ethos does in the Celestron StarSense Explorer DX 102AZ, worked from the published focal lengths and apparent field.

Field of view

ring = 1.52 degrees true
dot = 1.5 mm exit pupil

Computed optics

Magnification
66x660 mm / 10 mm
True field
1.52 degrees100 deg / 66x
Exit pupil
1.5 mm102 mm / 66x
Max useful mag
241xpublished
Barrel match
1.25 in eyepiece in a 1.25 in focuser
Fits

Good fit. In the Celestron StarSense Explorer DX 102AZ the Tele Vue 10mm Ethos gives 66x with a 1.52 degree true field and a 1.5 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 660 mm divided by 10 mm is 66x. The true field of view is the eyepiece's 100 degree apparent field divided by that magnification, 1.52 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 102 mm over 66x, which is 1.5 mm. That makes this a medium-power general setting.

The eyepiece to buy

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Related

Celestron StarSense Explorer DX 102AZ102 mm f/6.5
Tele Vue 10mm Ethos10 mm, 100 deg
Best eyepiece for the Celestron StarSense Explorer DX 102AZexit-pupil match

Questions and answers

Tele Vue 10mm Ethos in the Celestron StarSense Explorer DX 102AZ: magnification and field?

Good fit. In the Celestron StarSense Explorer DX 102AZ the Tele Vue 10mm Ethos gives 66x with a 1.52 degree true field and a 1.5 mm exit pupil, inside the telescope's useful range.