Hi Herb,
How about this:
Apparent field of view is the circle of light you would see when looking through the EP
on its own.
TRUE FOV is what happens to that circle of light, when you introduce Magnification to that eyepiece.
That is why TFOV changes if you stick the same eyepiece into two different telescopes (of different magnifications).
This is because, the more you magnify the image, the less you can fit into the same circle that reaches your eye.
Hope that makes sense.