For best results, you ought to be able to distinguish among all 10 shades of grey in the figure below.
If not, you may need to adjust your monitor's brightness / contrast / gamma.

A former sailor, bartender, driver, construction worker, welder, salesman, photographer, writer from Iceland, living now in Dublin Ireland.
Sandrine, a French ladyfriend of mine could´nt pronounce the name Gudmund, so she called me Goodmoon instead.
Some of the links I keep loosing.
www.photosecrets.com
www.diyphotography.net
Sunrise, sunset, dawn and dusk times, table




Tips and tricks :
www.melissaclifton.com/
www.doityourself.com/scat/photography
www.viivilla.se/gordetsjalv.asp?articleid=841
www.fodors.com/focus/
www.morguefile.com/archive/classroom.php
www.picnik.com
www.imagenomic.com
pro.corbis.com/creative/personalities/outline.aspx?i=1
Good thougts I found about photography:
www.radiantvista.com/media/articles/radiantVista_ar_mythO...
And a cure for boredom :
www.fresh99.com
www.jonhs.net/freemovies/wallace_gromits_cracking_contrap...
buzz.bazooka.se/
www.alloftv.net/
www.tv-links.co.uk/
www.oneliners-and-proverbs.com/
George Lucas in Love
www.peekvid.com
www.videostored.com/documentaries.php
Some of GoodMoon's docs
GoodMoon's network (134)
GoodMoon's public groups