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Message: <blockquote data-quote="goz63" data-source="post: 19887" data-attributes="member: 1557">OK, I have been looking at getting some extension tubes for some macro work and trying to figure out the math. On Adorama they have a Kenko extension tube that states "magnification ratio for Tube 25 is about 1/2 with the 50mm standard lens". So when looking at this it would seem that the 50mm lens would act more like a 100mm and would that also equate to a reduction in minimum focus distance by 1/2? According to the specs the 50mm has a minimum focus distance of 1.5ft or 18 inches, would that then change to 9 inches? I understand the concepts behind the depth of field changes with the extension tubes but not sure on the other affects based on the extension tube numbers. I am actually looking at getting the Kenko DG auto extension tube set which has the 12, 20, and 36 included. I want to know what each is going to bring to the table.Thanks,</blockquote>