Hello all I want to use a Sekonic L-358 light meter to measure the exposure settings for a three light setup comprised of: Three Canon 430EXII’s (in slave mode) controlled via one 580EXII (master mode) on a 5DMkII. In this setup the 580 master is set to not flash i.e. it is disabled. The L358 is in the “cordless flash” mode. My plan so far was to operate both the Speedlights and the camera in manual mode, test fire using the camera shutter button, use the L358 to measure the resulting exposure values and then readjust camera and / or lights to get the correct exposure i.e. set camera for t=125 f=11 and then change the light output until meter reads same. However, when I try this I find that the L358 reads f-2.5 unless I manually trigger the flash with pilot button, in which case it reads f=32. I think I have pretty well figured out what’s happening is: meter is reading the “pre-flash” by which the 580EXII “master” is communicating with the 430EXII slaves. Once the pre-flash goes the L358, captures the reading, locks for some time period (90 secs?) and misses the main flash that follows. I understand that this whole situation could be avoided by either using radio triggers or mains powered mono-block studio flashes – but I’d like to keep my Speedlights… I also suspect that if the test firing is done by activating the flash using the Pilot button of the 580 EX II, there is no pre-flash and a valid light meter reading is obtained. But this is not as convenient as controlling everything from the camera back LCD. My questions are: 1) Is there a workaround – for this? 2) Are there “smarter” light meters that know how to ignore the pre-flash? Thanks much.