Most people who reverse a lens onto another, are trying to do macro on the cheap. I have tried this and it does work. A true macro is the best way to do it though, and will offer the best IQ.
I made my reverse ring adapter by epoxying a step up ring to a filter ring without the filter glass backwards. Cheap and fun to play with, especially if you already have a 50mm in the bag.
I have the Tamron 90mm f2.8 SP Di Macro. In my area, it was a hundred dollars cheaper then the Sigma 105mm Macro. Most of what I read on the net also hinted that it was better then the Sigma also.
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