the depth of field has to do with the things behind (or sometimes in front) the subject in focus so the bigger the aperture the more blurry the background is.noob question: many peeps own those 50mm fixed lens at maybe say f1.4~1.8.
understand that the lower the aperture go, the deeper the depth of field?? (correct bo?)
so...what does the 50mm actually mean neh?
does it mean you can achieve the best effect with an object 5cm away from the lens??
The focal length of a lens determines the magnification at which it images distant objects. (from wikipedia) This means that longer focal lengths (eg 500mm) magnifies far images more. the effect depends on composition & exposure not so much on the distance of the subject from the lens