Click and have a look at the 2nd photo in 2nd line at this site:

http://www.museeniepce.com/index.php...n-photographie

To me it seems there is a swinging 45 mirror about where that white dot up front is, projecting the image via a 2nd oblique mirror and further optics to produce a small aerial- or groundglass-image that can viewed via that oblique binocular or goggle.


What do you think of that camera?