Ebay is a good place --- I am selling a Tamron AD70-300mm which is a macro lens too and I have used on the 450D I am also selling! ..... however this isnt an advert for me! Have you considered a "Close-up" lens I bought a set of these for my Olympus. Again you can find these on ebay and they cost a fraction of a macro lens - a good way to start. I paid around £15.00. This can screw directly onto the front of your 18-55 lens. If you look at the front of you lens it will tell you the filter diameter you need. I think the standard 18-55 you should have is 58mm. You need to know this when looking out for your close-up lens. Anyway - hope this helps.
Kevin
2012-08-07 18:30:38 UTC
There are quite a few different versions of lenses for companies like Sigma and Tamron. They make each version compatible with a certain system like Canon, Nikon, Sony, etc. So, make sure the one you buy is for Canon, which has an EF mount.
BriaR
2012-08-08 01:31:14 UTC
Sigma make that lens with different mounts to fit different cameras. Be sure to specifiy "Canon EF mount" when you buy it.
It is a great lens that will give you great results on your XSi
Andrew
2012-08-07 18:52:32 UTC
I'm with Kevin. As long as you specify Canon EF, it'll work perfectly.
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