Archived posting to the Leica Users Group, 2000/05/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11:48 AM -0400 5/22/00, Tom Schofield wrote: >1) As small as you can make it. No, no, no! The right size hole is one where the benefits of making it smaller, so that less spreading of the image occurs, is just balanced by the benefits of making it larger to reduce diffraction effects. This balance is extremely important. As diffraction effects are a function of the perimeter length and the area of the opening, it is also very important to have a clean, circular opening through as thin a material as possible. Gold is best, as it can be made very thin while still opaque, but brass is very good and is the usual choice. * Henning J. Wulff /|\ Wulff Photography & Design /###\ mailto:henningw@archiphoto.com |[ ]| http://www.archiphoto.com