Telescope Equations
It can be confusing understanding how to work out what you are seeing through a scope, so knowing what magnification and field of view you are getting really helps. Below are some basic equations which will allow you to work this out for yourself:
M = Magnification
Fs = Focal length of Scope
A = Aperture of Scope
Fr = Focal Ratio of Scope
Fe = Focal length of Eyepiece
AFoV = Apparent Field of View of Eyepiece
TFoV = True Field of View of Eyepiece
FS = FieldStop of Eyepiece
EP = Exit Pupil
M = Fs / Fe
TFoV = AFoV / M
= Fe x AFoV / Fs
= 57.3 x FS / Fs
EP = A / M
= A x Fe / Fs
= Fe / Fr
M = Magnification
Fs = Focal length of Scope
A = Aperture of Scope
Fr = Focal Ratio of Scope
Fe = Focal length of Eyepiece
AFoV = Apparent Field of View of Eyepiece
TFoV = True Field of View of Eyepiece
FS = FieldStop of Eyepiece
EP = Exit Pupil
M = Fs / Fe
TFoV = AFoV / M
= Fe x AFoV / Fs
= 57.3 x FS / Fs
EP = A / M
= A x Fe / Fs
= Fe / Fr