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Dave,
Nice drawing.
Magnification=aperture focal length/EP focal length.
If your telescope has a 600mm focal length the magnification=600/25=24.
The 25 is the 25mm focal length of your EP.
True FOV=apparent FOV/magnification.
The true FOV will depend on your eyepiece's apparent field of view.
If it's around 60 degrees (check its specs) then the true FOV=60/24=2.5 degrees. The 24 was your magnification.
Regards, Rob.
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