Canon1.4x RF Extender on 100-500 RF Canon Lens

When I first used the Canon RF 1.4x extender, the lens did not go back to 100 mm even after I removed the Extender. I was scared but noticed that there was a plastic tube looking wobbly part at the back of the lens. I gently touched it and it went back to alignment and the lens could zoom back to 100.
I contacted the service but the lady I talked to was not a technician, and could not answer. Anybody had this experience and what is the solution. The lens is only two month old. Now I'm afraid to use the Canon 1.4x Ext on the 100-500 lens.
Thanks,
Karl.

Hi
I have used the 1.4X and 2X with my 100-500mm on R3 body.
So far I have not encountered the problem you have described.
Chidu

I'm sorry to hear that, Karl. I have not experienced anything like that with the 100-500 and 1.4x TC. I would continue to use it with TC and if it happens again get it fixed while it is under warranty. Good luck, I hope it was a one time thing!

Thank you both. I'm using it with an RF 100-400 lens and R7 camera. I will use the 100-500 with the R5 camera. If the Bird is too far, then I won't shoot. I hope that Canon or somebody else will come out with an extender that fits the 100-500 lens, so you can use it as a 100-500 lens not as a 300-500 one.

Karl Egressy wrote: Thank you both. I'm using it with an RF 100-400 lens and R7 camera. I will use the 100-500 with the R5 camera. If the Bird is too far, then I won't shoot. I hope that Canon or somebody else will come out with an extender that fits the 100-500 lens, so you can use it as a 100-500 lens not as a 300-500 one.

Actually it's a 300-700 lens combo.

Charlie Woodrich wrote:

Karl Egressy wrote: Thank you both. I'm using it with an RF 100-400 lens and R7 camera. I will use the 100-500 with the R5 camera. If the Bird is too far, then I won't shoot. I hope that Canon or somebody else will come out with an extender that fits the 100-500 lens, so you can use it as a 100-500 lens not as a 300-500 one.

Actually it's a 300-700 lens combo.

Actually it is 1.4*300=420 to 1.4*500 700 mm combo. Or you call it a300-500 with a1.4x teleconverter combo instead of 100-500 with a 1.4x teleconverter combo.
Limitation is a limitation no matter how you call it. I think it is a bad design the lens that is.