Noise on SD600?

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ISO is the sensor sensitivity, and is purely electronic. It won't make a noise. Were you thinking of Image Stabilization (IS)? The SD 600 doesn't have IS.

Hard to say from what you've posted. Are you sure you haven't set start-up and camera action sounds (3rd - Camera Custom or Personal settings - menu on my A620). If it's mechanical, your lens barrel may be out of kilter, or just noisier than the other one(s?) you've heard.

I think I know what you are talking about and I think mine makes the same sounds... It might be normal...

I just bought one for my wife for Christmas. It makes that sound. She won't care, but I think it's a little odd. It sounds the same every thime so I doubt it's a problem.