Sporo wyjasnia: http://www.bobatkins.com/photography...ffraction.html

Inne linki:
http://www.secondpicture.com/blog/di...apertures.html
http://www.ehow.com/how_4717866_focu...hotos-slr.html

A tu dyskusje na zblizony temat co nasz watek, ale na innych forach:
http://www-srv-3.boards.ie/vbulletin...p?t=2055248587
http://www.clubsnap.com/forums/showt...hreadid=497702