On 8 Jul 2006 11:55:39 -0700, "tadchem" <[Only registered users see links. ]> wrote:
Look backwards through an opera glass and you'll get the same effect
with inverse (de)magnification.
The door has a positive longer FL lens inside, and a negative, shorter
FL lens outside. The angle is multiplied by the ratio of focal
"John C. Polasek" <[Only registered users see links. ].com> wrote
Why don't you give a specific recommendation? Are you suggesting the OP
purchase a fisheye lens for a camera? That's nutz! She does not need the
acutance and corrections of a spendy camera lens. The rest, for example
utility glass, don't specify what F of the lens.