Sally, it depends how much work you are prepared to put into your photography. Using a close up lens is quick and easy, using tubes will require more effort, and a bit of a learning curve if you're not familiar with using fully manual mode on your camera, but will probably give better quality images in the end.
You could use a reversing ring with your fast fifty to mount the lens onto the body backwards - this will have a similar effect. That would be a cheap option, but would require a learning curve again.
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