Implicating soft_focus → depth_of_field
Link to implication

Reason:

If soft_focus is the result of a camera's focus causing blurred edges (or the artificial depiction thereof), then it's just a specific form of depth_of_field.

EDIT: The tag implication soft_focus -> depth_of_field (forum #267402) has been rejected by @NotMeNotYou.

+1, I don't see why not, as soft_focus imho seems like just a specific form of depth_of_field.

The tag implication soft_focus -> depth_of_field (forum #267402) has been rejected by @NotMeNotYou.