I purchased a FL-300R flash to use with my E-M5 as a fill-flash. Back in the days of using Brand N, I used their fill flash system to brighten up dark shadows on sunny days, and add a bit of sparkle to photos on cloudy days. I want to do the same with my E-M5 and 300R. However, I find that despite setting my camera to a -1.3 stop flash amount, I find that I can't see the difference between using the flash and not using the flash. So.... Are they any good articles telling one how to use fill-flash on an E-M5. The manual is rather limited in this respect. Thanks.