In photographs of operating room procedures, do you find any real benefit in using the flash ring or do you use operating room lights? What white setting do you use?
Any kind of good homogenous ilumination is ok , exactly as in any other photo. Use of flash ring depends on the distance,, and the possibility that camera may introduce a shadow in the ilight produced by standard operating room light. So camera should not be in the line of the light. So probably displacing the room light or habing more than one light source will be enough or even better than ring flash.