With my DSLR and macro lens I get about 1:1 ratio.  Looking at extremely close macros in the galleries, I believe some photogaphers use add-on lens or devices to provide magnification beyond the 1:1 ratio.

If you have experience with add-on devices for magnified macro shots please let us know how well these devices work.   Do you know of some which are quiet effective and others which are basically junk? 

I am certain a similar thread has been here before but still would like to know what you think on the subject.       thanks.          TomDart.