Bluegem I believe that you might be able to do macro with the lens that you have. It will be more zooming than getting close to the flower. It is 4.9ft from where the film would be not from the front of the lens. I am not even really sure if you would need to use the macro setting either. I did some quick testing with my camera, 400D, and I didn't see any difference in focusing between the macro setting and an Av setting. Basically place the subject 4 feet 11 inches away from the sensor or about 4 feet 10 inches away from where you attach the lens, focus on the object, then zoom in on the subject.
I personally think that the 55-250 lens would have been better, being matched with the 450 it probably would have been more expensive. The manual has just technical info it's not really about technique.
~Gonzo13
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