Let me take a shot at this one and see how it sits with all of you. Let's say we had a camera with two identical flashes on brackets. One on the left of the body, and one on tthe right of the body. Let's also say both are controlled by the body's TTL flash system,
If neither flash had a ND filter, then the exposure made would be a perfect balance of light from both flashes, everything else being equal. That is, when enough light reached the film the flashes would be quenched. If one of the flash units had an ND filter on it, the TTL system would still quench both flashes when enough light has reached the film but the flash with no ND filter would contribute more light than the flash with an ND filter, giving you one brighter source of light on one side of the picture and a dimmer source of light acting as fill, to reduce contrast from the other side. Feel free to correct the error of my thinking but I believe that this is how it happens with my PZ-1p when I use the RTF and the AF500FTZ together. Len --- - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
