Objects that are out of focus are dependent on several things. You can still achieve that effect with your regular kit lens. Read articles, then go out and experiment. You'll learn more that way than us trying to explain it to you.
Don't just go out buying lenses without knowing what you're getting yourself into.
must do a price check for every purchase, regardless whether brand new or from B&S.
especially for B&S, must determine the price difference whether it is worth to buy brand new or 2nd hand.
yes i certainly agree.... the prices in BnS are not practical most of the time with only slight differences with respect to the brand new price... no wonder when i post my things at a reasonable price in the BnS i always get ridiculous cuts...
Can you please try writing in english instead of smslish? Makes it much easier to understand what you are saying.
What you are trying to achieve is called subject isolation using background blur. Even the 18-55mm kit lens can do it, but it's certainly easier at longer focal lengths.
Remember: There is no such thing as the "bokeh effect".