Angle of ligh

Hi folks,

I have a question, but I'm not sure I'll be able to put it properly.
Here it goes:

When the light enters the camera, it enters in an angle the depends on
the pinhole diameter or this angle is constant?
Imagine I have a pinhole of 0.5 mm. If I make a bellows camera and set
it to say 50 mm focal distance using an 8x10 film I'll have a very wide
angle image. But if I enlarge the bellows distance to 500 mm I'll then
have a telephoto image. Well, actually the image "cone" will be the
same, I'm just choosing a section of the cone farther away from the
pinhole or origin, and I am also selecting part of this cone to be
recorded. How can I calculate the cone angle? Will changes in the
pinhole diameter make any difference in this angle or it will always be
constant?

I hope I could make myself clear!
Thanks in advance for any info,

Joao
Received on Mon Feb 11 18:53:01 2002