What on Earth is Happening With The Sun?

A friend of mine took these photographs of the sun yesterday, she lives in Australia.  She did a bit of research and it is often dismissed as some sort of camera shake.  But it is not camera shake because if it were then the sun would also show a similar sort of pattern.

Have a look for yourselves and please comment.

Sun with string

String filtered

String filtered 2

String in the Sun extreme filter