Dynamic DoF(Depth of Field) - Blueprint

Nice work! I did everything according to this description and it works fine but I have one question about focal distance.
I’m trying to make DoF like in real life so if I look on near objects focal distance is small and all far objects are blured but if I look at far objects, only objects that very close to “eyes” (for example 50 cm) are blured and other objects (far then 50 cm) are sharp. Can ask for advice how to do it?