Re: pinhole photography/ calculating focal length

JosÚ L. Diniz (geofoto@mail.telepac.pt)
12 Jul 1997 23:33:47 GMT

BOZHIDAR D. DIMITROV wrotes:

> A pinhole has an angle of coverage of 180 degree coverage, and this
> is independent of the distance between the hole and the screen (note that
> you need an infinitely large screen to capture the image).

So the lenses do. The question is how much of the subject falls on the film
area.

> Varying the distance from the hole to the film changed the size of the
> objects (as well as their brightness, but NOT the relative size of
objects
> at different distances.

Of course not. The only parameter that changes such a relationship is the
subject-to-camera distance (perspective)

> Hope this helps,
> Boz

*See* you soon.

Cordialmente

geofoto@mail.telepac.pt
Jose' L.Diniz