Do a search on Raynox DCR 250 on this forum. I have used it extensively and find it works very well. I used it on a 90mm Macro and a 50mm prime.
Another cheap way into macro work is getting a set of extension tubes. They work very well.
Thanks. I will try to search for it.
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If you cannot find much I am willing to do another write up of the DCR250 on various lenses I have. Its been awhile since I have used it.