[ludi]

did you ever use a real camera?
its the same way, fstop<=>exposure time

[Intuition]

Raise the ISO when you raise the f/stop.

If you raise the F-stop you do make a sharper image and less DoF effect the image.

So in order for more light to get in you raise the ISO. Default is 100. Try 200-400

[rivoli]

i think all the dof/fstop/shutter speed/exposure stuff has been explained hundred of times. just try searching the forums, i'm pretty sure you'll find lot of info bout it.

anyway, i'd suggest you to have a look here, it's a good start:

http://www.maxwellrender.com/forum/viewtopic.php?t=1344

[Jey]

Hindus :

Read my explanation (3rd post, I am Groody), or the translation in English after.
http://www.maxwellrender.com/forum/view ... c&start=15