Which model I-phone do you have?
A good thread to read is http://goccf.com/t/160092
It sounds like you are probably getting too close to the coin. If you are too close the camera can't focus. Back up and don't use the zoom. On most iPhones the zoom is digital, not optical.
For taking the pic, get a remote shutter. When you tap the phone to take the pic that is enough to wreck the proper focus.
A good thread to read is http://goccf.com/t/160092
It sounds like you are probably getting too close to the coin. If you are too close the camera can't focus. Back up and don't use the zoom. On most iPhones the zoom is digital, not optical.
For taking the pic, get a remote shutter. When you tap the phone to take the pic that is enough to wreck the proper focus.





















