Just received the 430ex II. Read the manual and played around with various settings (high speed sync, second curtain, manual) with the 50mm lens. Still confused. Searched the forum for answers and each search keeps coming up with "hits" because people's equipment list in the signature... Changed camera flash mode to E-TTL II. Manual says I should have a little icon in the upper right of the flash display for recognizing the image sensor size, no icon. Took two pictures, one with flash one w/o... Camera Settings: Av mode (2.8) Auto ISO (AF on * if it matters) Flash:ETTL, HSS, Zoom --mm Results: w/o flash: 1/15 2.8 ISO 800 w/ flash: 1/15 2.8 ISO 400 I know I have some setting wrong only changed ISO and only by 1 stop, but can't figure it out.