Eyepiece and telescope pairing
Tele Vue 35mm Panoptic in the Celestron NexStar Evolution 9.25: magnification and field
What the Tele Vue 35mm Panoptic does in the Celestron NexStar Evolution 9.25, worked from the published focal lengths and apparent field.
Field of view
ring = 1.01 degrees true
dot = 3.5 mm exit pupil
- Magnification
- 67x2350 mm / 35 mm
- True field
- 1.01 degrees68 deg / 67x
- Exit pupil
- 3.5 mm235 mm / 67x
- Max useful mag
- 555xpublished
Computed optics
- Barrel match
- 2 in eyepiece in a 2 in focuser
Good fit. In the Celestron NexStar Evolution 9.25 the Tele Vue 35mm Panoptic gives 67x with a 1.01 degree true field and a 3.5 mm exit pupil, inside the telescope's useful range.
Magnification is the telescope focal length divided by the eyepiece focal length: 2350 mm divided by 35 mm is 67x. The true field of view is the eyepiece's 68 degree apparent field divided by that magnification, 1.01 degrees.
The exit pupil, the width of the light beam leaving the eyepiece, is the aperture divided by the magnification, 235 mm over 67x, which is 3.5 mm. That makes this a medium-power general setting.
The eyepiece to buy
Shop Tele Vue 35mm Panoptic on AmazonaffiliateFind Tele Vue 35mm Panoptic on eBayaffiliate