Understanding DOF

I know I've been away a while but it's been spent studying I will post the stuff I've been looking at and updates on
my work soon but for now here's this thing about......

Understanding DOF

Watched a good video that helped further understand my knowledge of depth of field it explained the 3 variables that all tie in that effect the DOF

1. Aperture the more open the aperture say my 50mm 1.8 lens, at f1.8 the shallower the depth of field, the more stopped down the aperture, say f7.0

2. Distance to the subject, the closer you get to the subject the shallower the depth of field the further away you get the deeper the depth of field

3. The focal length, the longer the focal length the shallower the depth of field the shorter the focal length say on a wide angle lens the deeper the focal length.

Hyperfocal distance after a little extra reading and using to DOF calculator to help understand this the hyperfocal length works by halving the hyperfocal distance and setting the focus to the hyperfocal distance then everything from half the hyperfocal distance to infinity will be in focus.