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what is your budget?

and for this sentence:
"For example, i cannot create the blurring background unless I use macro.   I know there is a portrait len, but I don't want to create so much while travelling."

the blurring background is called the depth of field
you don't want to create so much while travelling.....so you mean you don't want so much depth of field or you don't want to carry so many lenses?

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hmm...you won't consider having 2 lenses?
cuz or else pretty much you are saying you want to have a 天涯鏡 that doesn't need to come off the camera
I think my friend mentioned to me a cheap 天涯鏡, I think it was Tamron 18-270

or else, getting the 50mm F1.8 is a very good option too. 2nd hand should be less than $100 (I got mine for $70 from my friend!)
it is cheap and light-weighted. It is a good lense in term of its price
so even if you keep your kit lense and get this 50mm, it shouldn't be too heavy for you. I am a girl and I carry my kit lense, 50mm, 75-300mm USMIII all the time ga ^_^ and they are not that heavy at all (probably because they are all cheaper lenses, haha)

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here's a few pictures I took with the 50mm F1.8
I really like that it has the 恆定光圈 feature, and yes, the smaller the number, the bigger the aperature

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Craigslist~~!!!
you get very good price there sometimes, just be patient~~~

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not worth to buy a used one for $100 .. small different.

of course not la~

so patient is the key ^_^

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your second choice is EF 75-300mm f4.0-5.6 III USM  around $250
without large aperture, u will still able to create depth of field at the long side
but u have to shoot far away
ricrick 發表於 2009-4-13 10:47

this one is around $150 for used ^_^
that's how much I paid for