F-- appears in window with the 18-135mm attached to D80
F-- means that the camera cannot find an apeture with the other settings that it is on put yur ISO on auto and put the camera in automatic mode and it should work but it might be a problem with the apeture in the lense, in which case it would be very hard to fix and you would probably end up desroying the lense in the process, if you did not go to a specialist.
The lens is sticking out just slightly farther than it should be when off. When powered on, the motor struggles, but the lens does not extend. It tries to retract as well, with the same struggling motor sound. After about 30-45 seconds, it beeps 3 or 4 quick beeps, the Canon logo appears for a second on the screen, it then displays "E18" in the lower left, then shuts off completely.
i have the same problem E18
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