Macro Ring Flash
It would appear that the Cameron DRF14 is essentially the same product as the Marumi DRF14. The following reviews are fairly positive about the product:
Since I’m mostly interested in macro work as far as a ring flash is concerned, the Cameron DRF14 is likely my final choice.
(Important Caveat: this device will only attach to lenses with filter sizes 52mm, 55mm, 58mm, 62mm, and 67mm. Fortunately, all my lenses are 58mm or 67mm size.)