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Calculator
Eyepiece Calculator
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TeleVue.com: Article > Calculator |
The eyepiece calculator reveals the observing potential of your telescope with Tele Vue Optics eyepieces. It accepts basic information about your telescope and displays results for all current Tele Vue eyepieces. Refer to the diagram and tables below for the definition of the input and output parameters.
Return to Results| You must enter 2 telescope parameters
to see table results. |
Note on Field Stop Data: For discontinued or currently unavailable eyepieces, field stop data can be found in Eyepiece Specification table.
apparent field: perceived span of sky seen through eyepiece
(without telescope). Not used in true field (see) calculation.
exit pupil: image of objective formed by eyepiece. Location
where full apparent field is seen.
f/#: a ratio that describes the relation between the aperture
and focal length of the telescope -- important for photography
field stop: ring inside the eyepiece barrel that limits true
and apparent field size
focal length: effective distance from entrance of an optical
system to focal point
magnification: relative change in angular size of object
true field: span of sky seen through telescope/eyepiece
combination