A Tele Vue 24mm Panoptic in the Celestron C8 optical tube gives 85x, a 0.8 degree true field and a 2.4 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 24mm Panoptic in the Celestron C8 optical tube: magnification and field

What the Tele Vue 24mm Panoptic does in the Celestron C8 optical tube, worked from the published focal lengths and apparent field.

Field of view

ring = 0.8 degrees true
dot = 2.4 mm exit pupil

Computed optics

Magnification
85x2032 mm / 24 mm
True field
0.8 degrees68 deg / 85x
Exit pupil
2.4 mm203 mm / 85x
Max useful mag
480xpublished
Barrel match
1.25 in eyepiece in a 2 in focuser
Fits

Good fit. In the Celestron C8 optical tube the Tele Vue 24mm Panoptic gives 85x with a 0.8 degree true field and a 2.4 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 2032 mm divided by 24 mm is 85x. The true field of view is the eyepiece's 68 degree apparent field divided by that magnification, 0.8 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 203 mm over 85x, which is 2.4 mm. That makes this a medium-power general setting.

The eyepiece to buy

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Related

Celestron C8 optical tube203 mm f/10
Tele Vue 24mm Panoptic24 mm, 68 deg
Best eyepiece for the Celestron C8 optical tubeexit-pupil match

Questions and answers

Tele Vue 24mm Panoptic in the Celestron C8 optical tube: magnification and field?

Good fit. In the Celestron C8 optical tube the Tele Vue 24mm Panoptic gives 85x with a 0.8 degree true field and a 2.4 mm exit pupil, inside the telescope's useful range.