Originally posted by raider Thanks for the help, clm and JMS.
JMS - Okay. I now tried to set the lens to "A" and the SR previously also set to 100mm. I am on latest k100D firmware as well.
On Av mode, it still give an AV - - reading. Ditto for M mode. So I guess the "A" data is not being transmitted properly? How would I fix it.
Thanks!
Check for dirty contacts on the teleconverter and lens. clean them with a gum eraser (not an abrasive one)
ALso the A mode pin is resessed on the camera this pin gets shorted to ground (mount) to turn A mode on.
check on the TC with the lens attached AND the A mode set on the lens, that this pin does stick out, and with an ohm meter, that with A mode set there is a very low resistance between this pin and mount.
Note, this pin is the third one from, the lens locking pin
If not it is time to troubleshoot/