I do like the 40-80 but I am not sure I am operating it correctly. It doesn't seem to turn all the way to the macro position on the focal length ring stopping just short of 80. Also the macro seems to show up on the 40 position but not the 80 position. What am I doing wrong? I have tried it with extension tubes and I like the clarity when using the tubes. I also realize that I did buy the cheapest tubes I could have found anywhere off eBay(shrug) but if I treat them with great care they should work for awhile till I can afford better ones. If there is a site somewhere that I could download instructions on the lens or someone else to ask please let me know. Thanks for a good deal, Alan Wilson.