Your meter will read incident or reflective light measurements, no matter wich medium you chose (electronic or chemical, video or film). I have worked with many meters and strongly recomend: INCIDENT: spectra digital REFLECTIVE: minolta spot meter The new SECONIC combo meter (both in one)is a better buy money wise but is time consuming with the reflective measures because you can not read the meter through the view finder.(especially when lighting blue or green screens).(posted 8990 days ago)