I recently purchased the new Canon 30D. It was a definate up grade from my Sony F828. Right now, I am just shooting different style shots to get comfortable with the camera, and settings. I have been doing some portraits for people and pets, but mostly outside. I have used fill flash on these at times, and I use incident metering on most of my shots.
I was playing with the camera inside comparing flash readings from the sekonic to the camera meter. The sekonic consistanly reads less light than the camera, using incident mode.
As an example I am shooting with the Sigma 17-70mm. If I set the ISO to 100, the shutter to 60, and apeture 4.5, when I fire the flash, my sekonic reads that as apeture 1.6, even though my ISO and shutter are set the same as the camera.
Why the big difference? If I bump my ISO up to 650 to get the sekonic to read around 4.5, the shot seems slightly over exposed.
My distance is around 6 feet, and I am using the flash on the camera, not an external. I would expect them to read closer than this.
Is the difference due to reflective vs incident? Synchronization Problem? Calibration Problem?
Any Idea's. All comments are greatly appreciated.
Steve