Normally, long zoom are quite expensive if you want good image quality.  Sigma APO 170-500mm is one of the cheapest way to get to 500mm.
But you need good Image quality and with your budget, I think the best bet will be the 70-200 f/4L.  One of the sharpest of Canon's zoom lens plus excellent build.  I bought a 70-200 f/4L IS and the images are great.  I will post the pictures on a saperate thread.

http://forum.timway.com/f/viewthread.php?tid=156984&extra=

引用:

原帖由 icheng609 於 1/1/2008 11:54 PM 發表



But I use "little black" bor.............

Little Black????  50mm f/1.8????

引用:

原帖由 Maverick 於 1/2/2008 04:52 AM 發表


Sigma APO 170-500mm cost around $5000
Canon 70-200 f/4L cost around $5300

Both good lens but over $3000 budget as quote by dumpdump.
Unless dumpdump willing to sprend additional $2000.

...

Sorry....  

引用:

原帖由 def_lo 於 1/2/2008 01:11 AM 發表

?? Or Sigma lens ?? Haven't heard of anything named as "little black" in Canon series!!

BTW, usnameless, is there a big difference between "little white" and "little l ...

Now I am all confused...  

hahahaha

引用:

原帖由 dumpdump 於 1/3/2008 03:47 AM 發表
Thanks all but now still in consideration  5000 will be acceptable if the quality is good

Hahaahahaha, welcome to try the poison of Lenses!!!!!!!