How to take a blurry background in man with nikon d3100?
Samananda Maimom from imphal west manipur
Depends on what lens you're using but it should be the same for all. Make the aperture really wide by changing it to its smallest number it can go to(f/2.8 for example). Now what that should do is give the image shallow depth of focus by keeping whatever is in your foreground(what's in front of you) in focus or sharp and whatever is in the background blurry.
Well.well.well… Its so basic. Before buying camera, you should have learned basics of photography. And i assume that you don't know what is aperture, focal length, shutter speed.
let me try if i can,
keep the setting on "M". This is for manual. If you are using kit lens i.e. 18-55, set the focal length on 55. And aperture on lower number i.e. 3.5 something. (i don't know the exact number).Focus your man with little distance. And see if you can get that 'Blurry" background. Keep trying experiment.
You are asking about what is known as Depth of Field (DOF) which is that area in front of and behind your subject that is in focus. There are only three things that affect your DOF:
1) The focal length of the lens.
2) The aperture (also known as f-stop) used.
3) The subject distance.
This article explains DOF:
http://ezinearticles.com/?Learn-Digital-Photography---Understanding-Depth-of-Field&id=3845874
At this site - http://www.dofmaster.com/dofjs.html - you can use the DOF Calculator to compute your DOF for any combination of the three factors imaginable. Choose your camera from the drop-down list and your results will be accurate. Here is an example:
Nikon D3100, zoom at 55mm, aperture of f5.6, subject at 2 meters. Your DOF will be from 1.86 meters to 2.16 meters. Anything from 0.14 meters in front of your subject (1.86 meters in front of your camera) to anything 0.16 meters behind your subject (2.16 meters from your camera) will be in focus. This is a shallow DOF and if your subject is a person and you focus on their eyes (which you should) its possible that the tip of their nose will be out of focus.
Do the suggested reading and educate yourself about DOF.
This video tutorial will also help you learn about your camera:
http://www.nikondigitutor.com/eng/d3100/index.html Who better than Nikon to teach you all about your Nikon D3100?