Thanks for your nice comment.
The aperture was fix, just like the shutter speed. The shutter is moved by a spring as you can find it in a ball penn. I think its something between 1/30 and 1/60 of a second. The aperture is adjastable by a disc of three holes.
Very simple but working technology !
jw |
Germany
 from the past (10) wolle
(561) |