These days i have been trying my hand on Macro. During by sessions, i came up with some issue in metering. What i'm unable to understand is how to compensate for Flash when using TTL metering. Suppose i'm using Manual mode, and adjust the exposure using camera TTL meter. I take the shot and comes out to be OK ( but the foreground is dark). but when i switch on the flash, it's going to be a bit washed out. My point is if i want to brighten the foreground (meaning thereby i use flash), what should be my exposure compensation on camera so that the foreground is not washed out.
I know if i switch to Auto mode, i can get something similar to what i wanted in terns of Foreground exposure and details, but my question is how to achieve it in manual mode ( please don't reply by saying just use auto mode).
It shouldn't matter but just for completing of info, I'm using Canon 40D with 430EX Speedlite.+ Canon 100 mm Macro f2.8.