Reference Manual

P - Series
Reference Manual
88
TTL flash
Because the CCD element reflects light different than
film, and this cannot be communicated to the Contax.
Using TTL flash with the CONTAX 645 camera and the
P back, will result in a 2 f-stop overexposure. When
using TTL flash, the exposure compensation on the
flash unit must therefore be set to –2 f stops.