Correct me if I'm wrong, but doesn't this go agaisnt the basis of this sort of kludge solution?
If I had that money to spend on a reverse adaptor, couldnt I just put that toward a macro lens and stop holding my 75-300 backwards?
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It really depends on what you are trying to do in the way of macro photography. If you are into extreme macros, the reversed lens with bellows, rails and extension tubes offers magnification you simply can't get with conventional macro lenses. About the best you can do with a conventional macro lens is 5:! which is a lot, but not nearly enough to fill the frame with the head of an ant - something which is a specialty with some photographers who have carried it to an art form. With the reversed lens, extension tubes, bellows and rails it's possible to actually double this and get 10:1 and still get decent images. If you get the chance sometime have a look at Charles Chien's macros done this way. Some of them are unbelievable.
Here's one Charles sent me a while back - this is the head of a tiny Golden Ant - less than 1/8th inch total length taken by Charles using these techniques.
Lin