Thanks Slobadan, great yes I have the D, so then adding these to my canon glass keep it on par with great Canon macro lenses?
It can never be on par (i.e., the same) as with a dedicated macro lens, especially not if photographing flat subjects. Macro lenses are designed as flat-field lenses, that is, capable of reproducing a flat object sharp from center to corner. The lenses you mentioned are typical curved-field lenses, that is, sharper in the center than in the corners. Adding a close-up lens to such lenses is not going to deliver the same result as a dedicated macro lens, but it might be pretty close for most practical purposes. Especially if you are shooting, say, a flower in the center of the picture, with the background nicely out of focus.
