A Tele Vue 4.5mm Delos in the Celestron C6 optical tube gives 333x, a 0.22 degree true field and a 0.5 mm exit pupil. The worked calculation and whether it sits in the useful range.

Updated 05 September 2026.

Eyepiece and telescope pairing

Tele Vue 4.5mm Delos in the Celestron C6 optical tube: magnification and field

What the Tele Vue 4.5mm Delos does in the Celestron C6 optical tube, worked from the published focal lengths and apparent field.

Field of view

ring = 0.22 degrees true
dot = 0.5 mm exit pupil

Computed optics

Magnification
333x1500 mm / 4.5 mm
True field
0.22 degrees72 deg / 333x
Exit pupil
0.5 mm150 mm / 333x
Max useful mag
354xpublished
Barrel match
1.25 in eyepiece in a 1.25 in focuser
Fits

Good fit. In the Celestron C6 optical tube the Tele Vue 4.5mm Delos gives 333x with a 0.22 degree true field and a 0.5 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 1500 mm divided by 4.5 mm is 333x. The true field of view is the eyepiece's 72 degree apparent field divided by that magnification, 0.22 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 150 mm over 333x, which is 0.5 mm. That makes this a high-power lunar, planetary and double-star setting.

The eyepiece to buy

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Related

Celestron C6 optical tube150 mm f/10
Tele Vue 4.5mm Delos4.5 mm, 72 deg
Best eyepiece for the Celestron C6 optical tubeexit-pupil match

Questions and answers

Tele Vue 4.5mm Delos in the Celestron C6 optical tube: magnification and field?

Good fit. In the Celestron C6 optical tube the Tele Vue 4.5mm Delos gives 333x with a 0.22 degree true field and a 0.5 mm exit pupil, inside the telescope's useful range.