![Amazon.com : Fotodiox Pro Autofocus 2X Teleconverter Compatible with Canon EOS EF Full Frame Lenses and EF/EFs Cameras : Electronics Amazon.com : Fotodiox Pro Autofocus 2X Teleconverter Compatible with Canon EOS EF Full Frame Lenses and EF/EFs Cameras : Electronics](https://m.media-amazon.com/images/I/914wB61clhL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Fotodiox Pro Autofocus 2X Teleconverter Compatible with Canon EOS EF Full Frame Lenses and EF/EFs Cameras : Electronics
![My Canon EOS 5D Mark IV is asking if the inserted battery is original or not. What are the implications of my answer? - Photography Stack Exchange My Canon EOS 5D Mark IV is asking if the inserted battery is original or not. What are the implications of my answer? - Photography Stack Exchange](https://i.stack.imgur.com/rrcPE.jpg)
My Canon EOS 5D Mark IV is asking if the inserted battery is original or not. What are the implications of my answer? - Photography Stack Exchange
![troubleshooting - My Canon DSLR is showing "Err 01" — should I send my camera for service? - Photography Stack Exchange troubleshooting - My Canon DSLR is showing "Err 01" — should I send my camera for service? - Photography Stack Exchange](https://i.stack.imgur.com/gdPNd.png)
troubleshooting - My Canon DSLR is showing "Err 01" — should I send my camera for service? - Photography Stack Exchange
![Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube](https://i.ytimg.com/vi/hscED9ZYQK4/mqdefault.jpg)
Err 01 Communications between the camera and lens is faulty. Clean the lens contacts Quick Fix - YouTube
![Any idea how to fix this? It's happening with my sigma 75-300mm lenses I haven't used it in over a year. I've cleaned it with a normal cloth by nothing is helping? : Any idea how to fix this? It's happening with my sigma 75-300mm lenses I haven't used it in over a year. I've cleaned it with a normal cloth by nothing is helping? :](https://preview.redd.it/48i1il42g2551.jpg?width=640&crop=smart&auto=webp&s=0a054676abd4249fe4b5925faefecfc9625a61cc)