Originally posted by arniejrim Sorry to not reply Gerry - just reading through the post now.
I am getting the F-- message you mentioned.
How do I check the TC and the lens are coupled completely? Is a case of connecting the lens to the TC, selecting MF on the lens and then rotating the barrel as pbo suggested?
If you are getting the F--, then it is definitely not coupled.
Make sure you turn it fully as when putting the lens on the camera.
The only thing is it is easier to put the lens on the camera as it is only the lens to camera contacts that has to align.
With the TC, once you put it on the camera and is already aligned with the contacts, when you attach the lens to the TC after, twist fully also as it is harder for the TC to lens contacts to align.
If you are getting the F--, then the lens to TC is not aligned (more likely) or TC to camera isn't aligned (less likely).
Just make sure you fully twist till you get the "F" to give you a reading and not F--.
'Coz if the contacts are not aligned, then more so that the screw drive is not aligned or not coupled also.