I have no photo(s) to post but thought this might be the place to ask. I have a 105 non-vr micro. I want to get farther away from my subject so a 200 micro would be a good choice. However, I have a 70-200 vr zoom and can easily borrow extension tubes. Would the zoom and extension tubes be an acceptable substitute? Is there a chart that would show the focusing range at 200 for various Kenko extension tubes? What would be disadvantages aside from the inconvenience of switching tubes and having a limited focus range?