Quote Originally Posted by Agilulfo View Post
I'm not sure to understand why you don't rely in the DOF button of your camera.

Another simple solution, I guess you already have tried it, It's work in AV and shot in two f stops (the right one and another with more DOF). It seems faster than consulting charts.
That is one of those neat little gizmo and gadgets a manufacture includes to increase sales, they are great in theory but in realty just doesn't work very well. I find it to be about useless.