starting with macro

I have asked a couple of questions lately on macro photography.
The bad thing is that prices on ebay for macro lenses tend to rival in-store new prices for a lot of lenses (if they are still available). Do people ever check what a lens costs new before buying on ebay??

The thing I want to know is the following. I do see reversing rings for low prices (it's a simple piece of kit, so can't be expensive). I have a nice 50mm 1.7 pentax-a lens, will this do something good when attached to a reversing ring?

Reversing a lens will reverse its design concept, so the subject-to-lens distance is short. This results in superior close up performance. The shorter the focal length, the greater the magnification. a 28mm lens will give remarkable close up shots with a relatively flat field as well.

For the sake of the minmal cost of a reversing ring, definitely worth having a go.

Also try a short telephoto mounted on the camera, with a wide angle reversed on the front of it.