Some months back I began having issues with my Canon EF 1.4x II extender causing errors when mounted on my DSLR with any one of my lens.
I also was having problems with the locking mechanism that locked the lens in place on the extender.
I finaly decided I had to do something about it, as the extender was becoming un-useable.
Dismantling the locking mechanism was the first problem that I dealt with, and it became apparent upon dismantling the lock assembly that all it needed was some lubrication to free up the floating spring-loaded locking pin. I used lubriplate a lithium based grease for this, a grease that stays fluid under conditions ranging from very cold to very hot without migrating to the internal workings of the lens elements.
With that problem solved, and upon further inspection of the extender, I discovered that the four Philips screws (seen in photo) that secure the mounting ring in place on the lens end of the extender had become loose and the ring was free to move about creating issue with the gold contact pins that allow communication between the lens and the camera body.
With everything re-assembled, and the extender mounted on my DSLR, all the problems have been solved.
With the cost of a new EF 1.4x II extender being in the range of a quality camera lens, I was pleased to have it back in my lens arsenal, as I use it on a daily bases.
Expand the photo full screen for a closer look.....