I have a sekonic L-358, and read the manual many times. Exposure compensation on the meter is set to 0, and calibration is also at 0. I'm using it in Auto-reset cordless flash mode, I'm setting iso at 200, shutter at 1/200 and adjusting my strobes to get f8.0. I'm using the meter with the lumisphere out and pointed towards the lens. After adjusting the strobes and once I get the correct value, I fire the strobes a couple of times to make sure I have a constant exposure, I get 8.0 each time. But when I shoot the image with my camera in manual mode set at iso 200, 1/200 and f8.0 I seem to get an underexposed image. Here are two tests images, the first one is at f8.0 and the second one is at f5.6, (without changing the power or position of the strobes) I created the jpg files in LR3.6, the only thing I changed is that I used the camera standard profile and enabled the lens correction. I did not touch any of the exposure parameters. When I chimp, I also notice that the histogram seem to indicate underexposure. I shot this with my 70-200, I also tried with my 18-135 and got the same results.
Am I doing something wrong here? What do I don't understand?