Adorama has a really cheap set of extension tubes. I think you can get a set for the price of any one canon tube. I don't think they are as well built. Not usually an issue with extension tubes.
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I just tested a set of Soligor extension tubes for Canon but returned them, they don't really fit snugly, there's a bit of clearance if you stack them which feels awkward. I bought an extra Canon 25 instead and now use the older type EF25 mm plus the new EF25II and the EF12II. If I stack them I get really nice results with my EF 70-300 f4-5.6 IS. See attached pics of a spider attacking a beetle.
By the way, according to the instruction leaflet for the Canon tubes you shouldn't stack several tubes, but I don't quite see why not. It works fine.
Gerard Kingma
[a href=\"http://www.kingma.nu]www.kingma.nu[/url]
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