Lens for d3100 pics for blurry background?
I have the basic 18 -55 mm lens that came with the camera
And i want a lens that can zoom and nore than that i want a lens that can give photos like the main subject in focus is clear and rest all background is blurred.
I know for that i need a small F number and focal length >70 mm i suppose
The lens i have is f/3.5
And the lens i considered is 55-300mm nikon
But it has the range f/4-5.6
So f/3.5 better than f/4 for blurry pics but when i increase the focal length like 125mm the f number will also increase so is the 55-300 nikOn going to give great blurry background pics?
Or any other lens (tell )
Also tamaron and sigma have the same focal length range 55-300 with f/3.5 and is cheaper too
So is there a difference in qualities of nikon vs tamaron or sigma? How much diff?
And is the tamaron f/3.5 better than nikon f/4 for 55-300 mm range and blurry background pics?
If you want a zoom lens that you can use to shoot using selective focus, the 70-200 mm f/2.8 may be the right one for you.
First your terms. You're talking about DOF (Depth of Field) Read this article it'll help.
http://en.wikipedia.org/...h_of_Field
I would suggest the Nikon 50mm f/1.8. I shoot Canon so I have no experience with the Nikon version of this lens but I understand it's excellent and only about $150. The wider the aperture, as the article told you, the shorter the DOF.
You really don't need another lens. Your 18-55mm f3.5-5.6 zoom lens can do what you want IF you learn about Depth of Field (DOF) - what it is, what affects it and how to control it.
Read this: http://www.cambridgeincolour.com/...-field.htm
You should now know that the only three factors that affect DOF are:
1) The focal length of the lens.
2) The aperture used.
3) The subject distance.
You can use the DOF Calculator at this site to compute DOF for any combination of the three factors imaginable using just your 18-55mm f3.5-5.6 zoom lens:
http://www.dofmaster.com/dofjs.html
Here are a couple of examples using your 18-55mm f3.5-5.6 zoom with a subject at 5'-0'' and using the 18mm end of your zoom at f3.5 and the 55mm end of your zoom at f5.6:
18mm @ f3.5 focused on a subject at 5'-0'' DOF is from 3'-9'' to 7'-6''. Anything from 1'-3'' in front of your subject (3'-9'' from your camera) to anything 2'-6'' behind your subject (7'-6'' from your camera) will be in focus. As long as your subject is 3'-0 or more in front of the background the background will be nicely out of focus.
55mm @ f5.6 focused on a subject at 5'-0'' DOF is from 4'-9'' to 5'-4''. Anything from 0'-3'' in front of your subject (4'-9'' from your camera) to anything 0'-4'' behind your subject (5'-4'' from your camera) will be in focus. As long as your subject is 6" or maore in front of the background the background will be nicely out of focus.
Learning to use what you have to its capabilities is always cheaper and smarter than buying more equipment.
NOTE: The difference in DOF between f4 and f3.5 at 55mm or any focal length for that matter is virtually impossible to detect.
The 18-55mm lens is a zoom lens in case you didn't know it yet. It can also blur the background.
http://keerok-photography.blogspot.com/2011/05/how-to-blur-background.html
If you want to make far objects seem closer to you, you need a telephoto lens. It doesn't necessarily have to be a zoom lens like the 55-300mm 5.45X telephoto zoom. An 800mm non-zooming lens (1X) will bring a distant object 2.6X closer to you than the 55-300mm 5.45X zoom lens. Apparently zoom is not what you think it is.
http://keerok-photography.blogspot.com/2011/05/lenses-so-many-of-them-there-is-no-best.html
Lens brands? I guess you didn't get the memo yet.
http://keerok-photography.blogspot.com/2011/05/third-party-lenses.html