Ir papildau:

Wikipedia sako:
M: Manual mode controls shutter speed and aperture independently.

Apie ISO nieko neužsimenama.

Dar vienas:
http://www.photography-basics.com/2007/03/camera-mode-manual/
In manual mode you have to set the aperture setting 
<http://www.photography-basics.com/2007/01/what-is-aperture/> yourself 
and you have to set the shutter speed 
<http://www.photography-basics.com/2007/01/what-is-shutter-speed/> 
setting yourself.

O kur ISO?