There's the RayFlash (http://www.ray-flash.com), which requires a certain
flash-lens distance based on various canon/nikon flashes, or the Orbis
(http://www.orbisflash.com), which requires you to hand-hold the flash.
Neither of which are really designed for macro photography, but more for
studio/portrait ring-flash look.
Really you don't want the kind of power a normal flash puts out in a ring
flash; well, at least you need to be able to get it very low. The Metz
flashes are great at this, generally, and can be dialed down to 1/256th.
Still, its probably overkill.
There are DIY attempts at getting a ring-flash from the pop-up flash on
cameras using fibre-optics, but they all seema bit clumsy. (eg:
http://www.fring.we.bs/)
- Peter
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