Archived posting to the Leica Users Group, 2001/04/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> adapter. The focal length is about 28mm. The problem with a home made pin > hole is that first, the hole might be too big and you get fuzzy pics. > Secondly, the f-stop is uncertain whereas the Avenon device has an f stop > of about 128 (I think). It gives an overall bokeh like image. Hope this helps. If you project the pinhole with an enlarger or projector it is easy to check that the pinhole is round and to make an accurate measurement of the diameter, once you know the diameter you can then calculate the f stop. Some surprisingly unpinhole like pinhole images here for anyone interested http://www.awa.or.jp/home/edo/%20pinholeportfolio.html. JBH