A Tele Vue 27mm Panoptic in the Celestron StarSense Explorer 8-inch Dobsonian gives 44x, a 1.53 degree true field and a 4.6 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 27mm Panoptic in the Celestron StarSense Explorer 8-inch Dobsonian: magnification and field

What the Tele Vue 27mm Panoptic does in the Celestron StarSense Explorer 8-inch Dobsonian, worked from the published focal lengths and apparent field.

Field of view

ring = 1.53 degrees true
dot = 4.6 mm exit pupil

Computed optics

Magnification
44x1200 mm / 27 mm
True field
1.53 degrees68 deg / 44x
Exit pupil
4.6 mm203 mm / 44x
Max useful mag
480xpublished
Barrel match
2 in eyepiece in a 2 in focuser
Fits

Good fit. In the Celestron StarSense Explorer 8-inch Dobsonian the Tele Vue 27mm Panoptic gives 44x with a 1.53 degree true field and a 4.6 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 1200 mm divided by 27 mm is 44x. The true field of view is the eyepiece's 68 degree apparent field divided by that magnification, 1.53 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 203 mm over 44x, which is 4.6 mm. That makes this a low-power, wide-field and deep-sky setting.

The eyepiece to buy

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Related

Celestron StarSense Explorer 8-inch Dobsonian203 mm f/5.9
Tele Vue 27mm Panoptic27 mm, 68 deg
Best eyepiece for the Celestron StarSense Explorer 8-inch Dobsonianexit-pupil match

Questions and answers

Tele Vue 27mm Panoptic in the Celestron StarSense Explorer 8-inch Dobsonian: magnification and field?

Good fit. In the Celestron StarSense Explorer 8-inch Dobsonian the Tele Vue 27mm Panoptic gives 44x with a 1.53 degree true field and a 4.6 mm exit pupil, inside the telescope's useful range.