I want to start doing some macro photography beyond the restrictive limits I have now -this means beyond some zoom lenses with macro and close-up filters, all of which give ratios of at most 1:2. I would like to reach, at least, 1:1, and then, if affordable, 2:1 would be also great. But 1:1 is my main target now. I think that extension tubes is the best option, in terms of cost and results. But I don't know much about extension tubes. I mean, of all the extensions available, how do they get which ratios, etc Do you know of some place where this is explained a bit (books, web)? And also, do you have any other recommendation? My plan is to get the tubes/s for my Nikons. Wish I could just buy a micro lens!