PROJECTION
To
project an image into a dome, you'll need :
-
a computer
to broadcast/generate pictures (realtime sky simulator)
-
a videoprojector
to project these pictures
-
an additionnal
optical lens to perform the correct display onto the surface
We can
add a sound system to complete the immersive projection.
Optical system
The
principle of LSS is similar to digiscoping. the additionnal optical aims
to:
1°)
focus the picture in a small area (typically the size of a postage stamp).
A simple camera lens in front of a beamer can get an image like this:
2°)
Bend the beam and re-project the picture using a fisheye lens on the dome.
Note:
the projector is absolutly unchanged. This design allows great flexibillity
in the choice of many elements and developements
 
example
of bloc with 2 objectives
Notes:
Choice and meticulous optical alignment is essential for the quality of
the resulting picture. The projection angle can reach between 140 to 180 deg.
The use of argentic photographics lens can give also good results.
Yves
LHOUMEAU
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