A Explore Scientific 14mm 82 Degree in the Sky-Watcher Heritage 130P gives 46x, a 1.77 degree true field and a 2.8 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 Heritage 130P: magnification and field

What the Explore Scientific 14mm 82 Degree does in the Sky-Watcher Heritage 130P, worked from the published focal lengths and apparent field.

Field of view

ring = 1.77 degrees true
dot = 2.8 mm exit pupil

Computed optics

Magnification
46x650 mm / 14 mm
True field
1.77 degrees82 deg / 46x
Exit pupil
2.8 mm130 mm / 46x
Max useful mag
about 260x2x aperture
Barrel match
1.25 in eyepiece in a 1.25 in focuser
Fits

Good fit. In the Sky-Watcher Heritage 130P the Explore Scientific 14mm 82 Degree gives 46x with a 1.77 degree true field and a 2.8 mm exit pupil, inside the telescope's useful range.

Magnification is the telescope focal length divided by the eyepiece focal length: 650 mm divided by 14 mm is 46x. The true field of view is the eyepiece's 82 degree apparent field divided by that magnification, 1.77 degrees.

The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 130 mm over 46x, which is 2.8 mm. That makes this a medium-power general setting.

The eyepiece to buy

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Related

Sky-Watcher Heritage 130P130 mm f/5
Explore Scientific 14mm 82 Degree14 mm, 82 deg
Best eyepiece for the Sky-Watcher Heritage 130Pexit-pupil match

Questions and answers

Explore Scientific 14mm 82 Degree in the Sky-Watcher Heritage 130P: magnification and field?

Good fit. In the Sky-Watcher Heritage 130P the Explore Scientific 14mm 82 Degree gives 46x with a 1.77 degree true field and a 2.8 mm exit pupil, inside the telescope's useful range.