10-31-2019 11:00 AM
If you really want a shutter speed faster than the flash sync speed, you need to use High Speed Sync, but it will cut down on the flash power so you might not get the range you need which is probably iffy now anyway.
11-03-2019 08:44 PM
What is the difference in the 1-128 power setting in the Canon 550 EX and the Flash Compesation setting.
11-04-2019 09:13 AM
You really need to get Syl Arena's Speediliters handbook, but it is currently out of print and outrageously expensive.
To answer your question, the 128 levels are for manual shooting, and the flash compensation is for E-TTL to balance flash and ambient light.