#### duffeymt

##### TPF Noob!

My focal length on the prime will always be 50, so when I select an aperture of f/22, for example, and I want foreground to background sharpness, 1.) How do I use these distance settings to set the distance to get the MAX DOF sharpness for the landscape, and 2.) if I set my tripod lower to the ground to compose a close foreground with a vast background, how do adjust the distance setting for this?

I have checked out the masterDOF calculators and if I select my camera (D40) and my focal length of 50, with f/22, the last variable is subject distance. Is this the closest foreground subject? I see at about 20 feet in this subject distance field gives me an infinite background, so is this telling me that for this lens, since the focal length is fixed, the HFD for maxium FOD is always going to be 20, so H/2 gives me ~10 feet to infinity? Can I get anything closer than 10 feet in sharpness or is that my limit?

I know that is a lot of questions, but just trying to think out loud to make sure I understand this.

Thanks!