I think you nailed it, the problem with the pre-flash that is. Ive never seen it but it makes sense. On the Ikelight strobe there are no adjustments.The strobe is for the Aquashot 3 camera system, Piont and shoot 35mm film. Ikelight said there new strobe [Aquashot auto35] is one F-stop faster than the one I have but they dont tell what it is. So in review to eliminate the pre-flash I click ok, camera, scroll to flash,click slave if I click slave flash I scroll through some numbers 1-10, what is the explaination for the numbers? Below the flash there is a slow tab, would this for my purposes be set at slow1, slow2 or the red eye slow flash? Also in manual mode ill simply ignore the red lettering to the left showing underexposure because in raw mode I can correct it and save the photo as long as its in focus?