A Explore Scientific 14mm 82 Degree in the Sky-Watcher Evostar 72ED gives 30x, a 2.73 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

Explore Scientific 14mm 82 Degree in the Sky-Watcher Evostar 72ED: magnification and field

What the Explore Scientific 14mm 82 Degree does in the Sky-Watcher Evostar 72ED, worked from the published focal lengths and apparent field.

Field of view

ring = 2.73 degrees true
dot = 2.4 mm exit pupil

Computed optics

Magnification
30x420 mm / 14 mm
True field
2.73 degrees82 deg / 30x
Exit pupil
2.4 mm72 mm / 30x
Max useful mag
170xpublished
Barrel match
1.25 in eyepiece in a 2 in focuser
Fits

Good fit. In the Sky-Watcher Evostar 72ED the Explore Scientific 14mm 82 Degree gives 30x with a 2.73 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: 420 mm divided by 14 mm is 30x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 2.73 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 72 mm over 30x, which is 2.4 mm. That makes this a medium-power general setting.

The eyepiece to buy

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Related

Sky-Watcher Evostar 72ED72 mm f/5.8
Explore Scientific 14mm 82 Degree14 mm, 82 deg
Best eyepiece for the Sky-Watcher Evostar 72EDexit-pupil match

Questions and answers

Explore Scientific 14mm 82 Degree in the Sky-Watcher Evostar 72ED: magnification and field?

Good fit. In the Sky-Watcher Evostar 72ED the Explore Scientific 14mm 82 Degree gives 30x with a 2.73 degree true field and a 2.4 mm exit pupil, inside the telescope's useful range.