Hi All,
I was using my D90 today (first time in a good while), and an error occured "Err" now the camera will not fire and displays this flashing "Err" error.
I think I may have moved the F stop inadvertently at some critical point but cannot be sure.
I was trying things like remove and return battery and card, fully charge battery , clean lens connections, but to no avail.
One thing I could not do was "UN-Lock mirror for cleaning" it seems to be permenantly greyed out, and I wonder if this is part of my issue.
Any pointers appreciated.