To see where the problem is, select various f stops from 2.8- 32 (or whatever lens has) and watch the way the iris responds. Open to largest aperture and try rotating again to see whether any blades are falling out of position..
having tried this on my SLR camera you may need to leave the lens on to check the iris, to do that you may have to open the back of the camera, select B for exposure and whilst the shutter is down turn the aperture ring to watch the iris. Depends where your aperture ring is.
turn camera on, flash off, lens off. Select longest possible exposure time,either B or 1. Depress shutter and keep held down, look in where lens is meant to be,rotate camera to see what if anything is obstructing CCD. If yes then get back to us. I believe you should be able to fix most camera problems yourself, I'm not too familiar with your camera so this general advice. Your f-stops are prob on camera body but...
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What happens if you change lens? Sounds like the iris.