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KB 2281

Underexposed / Overexposed images on Phase One 645 AF, DF and DF+ camera bodies

Last updated: 06-01-2016

Problem

Images are underexposed even though aperture and shutter speed are set to an expected normal exposed image. Or a light meter informs that the flash supplies the proper setting for an expected normal exposed image. It happens only when shutter speed are approx. 1/4 sec or slower. 

The images below shows the same image taken at the same exposure settings (1/4s at f22) with different shutter curtain priority settings. 



Histogram of the image taken at 1/4 second, f22 with shutter curtain priority set to 1st


Histogram of the image taken at 1/4 second, f22 with shutter curtain priority set to 2nd

Solution

Check the Custom Functions in the Phase One camera. On the selector wheel on top of the camera select CF - go to bank C-27 and check if 1st (0) or 2nd (1) shutter curtain priority is selected . 

In most cases when shutterspeed is set to 1/4 or slower - the 2nd shutter curtain priority is recommended. 
Faster shutterspeeds can be used with 1st shutter curtain priority.

Link to all CF (custom functions) below:
 

Custom Functions overview

Related article: 

Flash sync timing with front curtain or second curtain synchronization with the Phase One 645 camera