![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
![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
![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
![Canon Knowledge Base - Troubleshooting steps to follow when AF (Autofocus) does not work on the EOS REBEL T3/T3i. Canon Knowledge Base - Troubleshooting steps to follow when AF (Autofocus) does not work on the EOS REBEL T3/T3i.](https://support.usa.canon.com/library/attachments/ServiceWareImages/LDImages/WSSS/NewWSSSImages/G0101184.gif)