Originally Posted by firstname.lastname@example.org
this is an off-topic question for Chris: you mentioned that your sekonic is very accurate. There was a thread previously where it was mentioned that some of the light meters are tuned for digital cameras and hence tend to be 1/2 stop underexposed. Have your found this to be true for your sekonic?
What I said before was that incident meters underexpose by a stop when used with print film. This is because they're calibrated for slide films, which have a shorter exposure range than print films. That's true of digital cameras too. That's if you use the incident meter in overcast conditions, or in the brightest lit area on sunny days (in other words if you hold the meter in the sunlit area not the shadows).
This is true of ALL incident meters. My Sekonic matched readings from my other meters (I have a Minolta Flash Meter IV and Flash Meter VI and Auto Meter IIIF) in incident mode and matched the Flash Meter VI in spotmeter mode.
Get a copy of Phil Davis' "Beyond The Zone System" if you want a technical explanation of why this is so. It takes several pages of text to explain and I'm too lazy to type it. If you want a REALLY REALLY technical explanation, get an old book called "Exposure Manual" by British author Jack Dunn. The last edition was printed in 1982, and older ones go back to the 1950s. Dunn explains the calibration equations used to calibrate meters and how these relate to films and actual exposures, but it is math and physics heavy!