This a website about photography and photographic optics. Its main purpose is to identify lens imperfections and otherwise explain optical phenomena observed in photographic images. I am not professionally involved in photography, optics or web design; this website is just a hobby project with new material appearing at an irregular and slow rate. In daily life I work as an underwater acoustician.
Onion rings and dust on the bokeh page.
Remarks or questions can be addressed to the e-mail address mentioned below. Perhaps your question is already answered by the faq. The probability of your e-mail being read increases if you choose a clear subject. "Hi!", "Hello!" or "Thanks!", for example, are poor choices as spam and manual filters are uncompromising.
All contents © Paul van Walree—all rights reserved.
You may use fragments of the contents for noncommercial applications, if the origin of the
material is properly referenced. Commercial use of material, or integral copying for
publications, requires explicit approval of the author. In case of doubt, why don't you
consult the faq or just ask?
Last update of this site: March 31, 2013.