New to flash photography and I must say it has changed my photos tremendously (EM-5 and FL600r). Still trying to figure out what is under and over-exposing shots and have 2 quick questions. 1) Most of my flash shots are used with TTL and bounced off the ceiling or wall from behind. If I'm using TTL and bounce the flash is it a rule of thumb to increase the flash EV due to the distance and power diffused from the bounce? Or does the camera know from a how much light is coming back thru the lens and make adjustments? If bouncing, is it better to use manual mode and adjust the power of the flash for each photo being taken? 2) when using the FL600 remotely I need the OM-D flip up flash to trigger the FL600. Does this defeat the purpose of remote flash because the flip-up flash is still coming head on? Or does the flip up flash fire at a minimum level to not affect the shot? Would hate to use the FL600 from an angle to create desired shadows only to see the flip up flash fill all the shadows up. THANKS!