About these pages


This a website about photography, photographic optics, and digital signal processing. Its main purpose is to illustrate lens faults and other 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.

Recent additions & changes

An article on corrections in digital imaging.


Sidenotes appear.

The text-editor creation toothwalker.org was tested with recent versions of Firefox, Opera, Safari, Google Chrome, and Internet Explorer. The content looks remarkably similar between these browsers. Dated browsers with poor CSS support will not display the pages as they are intended, but hopefully the content is still legible. There is no adware, spyware, cookies, or anything harmful in any way, and the site is fully functional even with JavaScript disabled.

E-mail policy

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 automated and manual spam filters are uncompromising.

The photographer

The photographer.

Copyright notice

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?

E-mail: info@toothwalker.org
Last update of this site: June 12, 2016.

With tripod
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