Lenses


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You can blur the background by using large aperture, or small f number (2.8 is smaller than 5.6 if terms of numbering).

The special lens asked by the original poster is called defocus lens. Nikkor AFD 105mm f/2DC.

http://www.nikon.com.sg/product/lenses/afnikkor/AF-TP-105.htm

AF DC-Nikkor 105mm f/2D
Standard portrait lens with Defocus-image Control
- Fast, medium telephoto lens featuring Defocus-image Control
- Large maximum aperture allows shooting in dim light
- Rounded diaphragm opening makes out-of-focus elements appear more natural
- RF (Rear Focusing) technology for fast AF operation
 

Just like to add that besides wider aperture, longer focal length will contribute to shallower depth of field (DOF) and make the background blur too. For example the background of a 200mm telephoto lens at f/4 will be more blur then the background of a, say 28mm wideangle lens at the same f-stop. :)
 

Originally posted by ziploc
Just like to add that besides wider aperture, longer focal length will contribute to shallower depth of field (DOF) and make the background blur too. For example the background of a 200mm telephoto lens at f/4 will be more blur then the background of a, say 28mm wideangle lens at the same f-stop. :)

And one last thing is the distance of your subject.

Focusing on a subject 10 feet away using 200mm at f4 will result in much blurrer background than focusing on the same subject 30 feet away using 200mm at f4.
 

Originally posted by Shadus
If you are refering to making a picture 'soft', then Kho King mentioned that lens and Canon have one as well, but they can it a 'Soft Focus' lens.

However, most people will just use a soft filter.

Please note that be it soft focus, defocus, soft filter -> it does not only make the background blur, it makes the entired picture soft. The intention is to give it a dreamy, romantic feel to the picture.

Nikon's Defocus Control allows you to manipulate bokeh. The subject that is IN FOCUS will be VERY sharp.
 

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