DOF help

[Bolerus]

this is such a newbie question I know.

But can somebody remind me how to get a shallow DOF.

is it high Aperature or low Aperature

I have been playing with a couple of settings and it doesent seem to change.

OR am i just going insane

 

[Bolerus]

thanks guys.

for some reason i had got it into my head it was the higher number the lower the depth of field, I had takes the Aperature up to 32 lol. pic was a bit dark, but all in focus