how are picture with blurred background achieved?

Question

I've seen pictures of the same subject with blurred bg, and some whith sharp bg. What makes the difference b/w the two?

Answer 1

The smaller the aperture setting, the less scattered light to hit the lens, therefore, the sharper (but darker) the image is. A small aperture needs more light, so to compensate you can allow a slower shutter speed, but risk getting motion blur.
Fot a shallow depth of field, you need a great aperture, thus, you can use a faster shutter speed to achieve it.

Answer 2

The focal length of the lens, distance between camera and primary subject and aperture setting all combine to create a blurred background. All these variables affect what is known as depth of field which is the range in front of and behind the focus point which appears acceptably sharp. Generally, the longer the lens and the larger the aperture(F-stopsmaller numer is bigger opening)) the shallower the depth of field available. Landscape photographers often use wide angle lenses for their inherent greater depth of field. That's how , for example, they can have rocks in the foreground sharp and the mountains in the distance also pretty sharp. Portraits are often taken with a lens of 85mm or longer (in 35mm format) to lessen facial distortions ( big noses) and cause that background blur ( out of focus). Bokeh is the quality of that blur not the blur itself. Different lens, aperture, variables contribute to bokeh, some photographers search for lenses that exhibit specific bokeh properties.

Answer 3

Kirkus is correct take a look at SLR these little number on the lens with the infinity symbol when the F-stop is set you look at the corresponding numbers and it will show you how many feet in front and behind the subject is in focus.


God Bless You and The Southern People.

Answer 4

It;s called depth of field and is created by using an f stop that only has the subject in focus. It's called Bokeh in the Photographers world. Google it to find out more.

Answer 5

There are generally two kinds of lens system used in cameras.
AUTO FOCUS
ANOTHER IS WITH ZOOM/FOCUS SYSTEM
actually what u asked is done with the latter system.when we focus an object(bird or somethin)the object looks clear but the things which are closer/distant to that object would blurr.
Our non-pro cameras come with auto-focus so its not possible to crate that effect with them.
for this either u must have an SLR camera or u hire a photographer for that
Another way could b to take pics with the ordinary one and then edit those images with aphoto software like photoshop or google picasa.
With google picasa (now getting popular bcos of its easy to operate effects fpo newbies) we can directly publish our images to web too.its inbuilt system there.
and ya,,the effect u asked is definitely there..
search for it or look for it ,free download here http://angle-mine.blogspot.com

Answer 6

leave the shutter open and it gives the blurred background but what ever you are photographing has to be completly still hope this helps