Hi dear pmorala
1) check the lens if to drive the diaphragm actuating lever that opens.
2) also check the aperture lever on the camera body may be broken or bent.
3) look at the Shutter release the mirror and shoot the camera in a low speed (M mode) note if this works correctly or some of the leaves that make up the curtain is loose or out of place.
Everything seems fine ... OK command dial to select the full aperture, shoots the camera at you and see the diaphragm (set M mode and speed sh bellow 1 / 8). Full closed? = Aperture Mechanism defective.
Regards
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