New & Need Help Choosing a Lense

kmk10us

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Hello All,
I have been looking to buy a new lense for my Nikon D5000. I want to have the subject (mostly my very young children) in focus and the background blurry. I am down to looking at the Nikon AF 50mm f/1.8 (around $130) and the Nikon AF-S 50mm f/1.4 (around $470). Being new I was going to buy the cheaper one until I found out that on my D5000 it would not auto focus without a motor on the actual lense (hence, the AF-S) I am assuming this is a huge deal? Especially if I am new and trying to take picture of moving subjects? Are there any other brands I could look at that would fit my camera? Any help would be greatly appreciated!!
Thanks!
 
......I want to have the subject (mostly my very young children) in focus and the background blurry........
Then you will want to learn about Depth-Of-Field (DOF), how auto focus works, and it's limitations.

There are 4 things that effect DOF:
  1. Lens focal length
  2. Lens aperture
  3. Subject to image sensor distance
  4. Subject to background distance.
For DOF visit:
Understanding Depth of Field in Photography
Depth of field - Wikipedia, the free encyclopedia
http://www.tawbaware.com/maxlyons/calc.htm
Online Depth of Field Calculator

For auto focus visit:
Understanding Camera Autofocus
Autofocus - Wikipedia, the free encyclopedia
 

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