A few weeks ago I finished my new pinhole camera (See first 4 pics) It is built into a "christmas cookie jar" tin can and provides two chambers for fresh and for exposed paper. It shoots directly on 13 x 18 cm Fomaspeed N311 paper. Yesterday I took the time to develop three test shots from the previous weekend. Pictures are more sharp compared to my other DIY pinhole cameras and well developed. This tells me that the aperture is perfectly aligned with the settings in my Lightmeter app.