I have a teleconverter (Bower MC 2x C/AFI) which has pins to connect the lens electronics to the camera body. It works well with my autofocus lenses. If I try to use the converter with a manual-focus lens, like the Samyang 135mm F2.0, I always get the following error:
Communication between the camera and lens is faulty. Clean the lens contacts.
The camera body is a Canon 90D or 550D (same behavior on both). The lens contacts are clean. The picture is actually taken successfully but the error prevents me from taking more pictures.
- Is there any way to avoid this error?
- Are there any teleconverters specifically for manual-focus lenses? I cannot seem to find any online.