I don't have money for a marco lens, so I was thinking of getting an extension tube for my 40D. I'd like to take pictures of my garden out back this spring and I thought that if I put an extension tube on my 50mm lens then I'd be able to do it. I like to take high aperture shots because I like how they look and I think taking some high aperture shots in the garden would look amazing. I was thinking of getting these Kenko ones I saw online because they seem well constructed. But this is my first time getting into that so does anybody have some advice for me? Does anybody have some example photos that were taken this way that I could look at?