Wednesday, January 2, 2013

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 ?
>>> Lens for d3100 pics for blurry background?