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Hi Phil,
As JA said :-)
By definition, magnification is a ratio, number without dimension (unit etc).
So term "magnification" between camera and eyepiece is meaningless..
On the other hand, eyepiece magnification is ratio between two angles : angular size of the object (for example Moon) as seen trough telescope (with eyepiece) vs angular size with unaided eye.
Camera has FOV and "scale" (arcsec/pixel or arcsec/mm for example).
So, the most intuitive/practical number for "magnification" as per your post would be ratio between two FOVs (FOV through telescope and camera FOV).
In case you print the image on paper (or look at it on the screen) , things become much more complicated :-) You have to take into account the physical size of the screen or paper, zoom factor.. You don't want to go into that too far ;-)
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