Double the distance between a flash and the meter and it should read 2 stops less for each doubling of the distance. That is the test for linearity of the response; no need for any calibrated light source, you just need an accurate way to measure distance and a repeatable flash.
Originally Posted by brucemuir
So, yes it works perfectly.
Again, that was just the linearity test. The cheap-and-dirty calibration involved flashing a known to be good SB-28 Nikon flash, set to non-TTL auto, at various f-stops and reading the reflected value with Vivitar meter set to 'reflected light.' White wall, black wall, gray wall, it does not matter. Distance does not matter either. When the meter read the same f-stop as the flash was set for, it was considered 'calibrated.'
Realize that these inexpensive digital units just are accurate to a single f-stop. This Vivitar branded unit was also sold as Polaris or Shepherd FM800 and Novatron used to market one also:
Last edited by ic-racer; 09-16-2013 at 08:15 PM. Click to view previous post history.