I have a HTC One M7. The rear camera lens cracked after a few days from new in June 2013 for no apparent reason and I have lived with in since as it didn't affect the picture quality. However, all my pictures now suffer the purple tint issue and look grainy. I cannot get any sharp pictures.
I bought the HTC One M8 on launch day and have taken very good care of it since. Recently, the back camera has been taking very blurry pictures. The front camera is fine though. The lens is not cracked or scratched at all. I've wiped the lens down very good, but it doesn't help (both main and duo lens). Anyone else have this problem?