Hello,
I tried ISO overriding on my A610, just on jpg yet...and I could observe only possibility to go lover than the 50 ISO of the camera (let say arround 60 real ISO) (arround 30 real ISO), but not really higher than 400 ISO of the camera (actually around 500 real ISO)...so it seems to me that with this camera, we can only decrease a bit ISO compared to 'normal' settings...(that's a great feature to take water flow at long exposure)...but unfortunately, higher ISO are not accessible (that would help to take picture in hard light conditions...)
Did anybody get the same results

SuperManu