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Why am I getting such wide apertures in Program (P) mode indoors with flash?

April 26, 2017apertures Flash Indoors mode p program wide

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Why am I getting such wide apertures in Program (P) mode indoors with flash?

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A. In “P” mode when using flash, the camera will adjust exposure for the ambient light whether or not flash is being used. The shutter speeds will be limited to 1/60 and 1/125 (AFD/AFDII only, the original 645AF will permit slower speeds), which will result in the camera selecting a wide aperture in an attempt to obtain a correct exposure. Indoors, the use of the “X” setting will prevent this. If the flashs output is controlled by either the cameras TTL system or an on-flash thyristor, a correct exposure should result at the “X” settings 1/125 sec. shutter speed, assuming the aperture is manually set to the proper f/stop.