On my finpix s7000 the auto mode is set for 2.8 apeture and the pictures are fine.. However, want to get more depth on my close ups. Since I am using a tripod, the lenght of time is not a problem so I want to set the apeture to as low as possible which if 8. I assume I am going to get the same picture but with more depth. However, virtually everything has changed, lighting,color, etc. It says the ISO is 200 in such a circumstance. Is ther any way to get more depth without cahnging everything else?