Photo Friend exposure and DoF

This is a great tool, really helpful to have an extra reference for exposure.I do with that more than one parameter could be locked at a time, and wish that the ND calculation could be changed to stops or the strengths of ND filters usually used on camera. I’m guessing this calculation is all based around middle grey?

Horrible app. So many better choices. Super confusing. Poor documentation. Doesn't work - probably foes not work with recent ISO builds.

I’ve been trying to learn SLR settings for 30 years. After one look, it all is clear! With this app, I can use a light meter, then set my camera and get instant feedback on how some settings effect others.