I wasn't really satisfied with the first pictures made with my Zeiss Ikon pinhole camera, therefore I modified it a little bit. I replaced the Rollei lens cap with a Canon FD rear lens cap. So the focal length changed from 45mm to 70mm.
Focal length: 70mm
Image circle: 134mm
I shot some landscape pictures and a few of the Fernmeldeturm Grünwettersbach, but just one picture became something, but this is also very unsharp...
I think the first modification of the camera was still better than the second one, but in any case it was the last time I've used a pinhole camera...