I see, I did try doing right exposure on the subject, not the surroundings, but never being able to achieve such drastic results. I assume I need to look for subjects in the lighter spot than the background/foreground. Thank you very much!
I see what you mean now. This comes from the careful lighting measure - you expose on the lightest spot of the subject, which is probably 2 or 3 f-stops higher than other parts, then all other parts become under exposed. There is another reason for this, sometimes, the subject you are interested has some distance from other parts in the frame, so making a correct exposure on the subject will make it standing out, other parts become under exposed as well.
Not just blur. I mean the background looks much darker than the subject, almost totally black, such as in your P3, P6, P7, P8. Seems only the subject is under the spot light.
Do you mean to make the background blur? This is due to two factors: long focal length (using telephoto lens such as 100mm or above), and wide aperture (e.g. f/4 or f/2.8).
