Roy C
Occasional bird snapper
I have read about certain Kenko 1.4x converters causing the 5D3 to 'lock-up' with some Canon lenses. I am specifically looking to use a 1.4x with the Canon 100mm L IS Macro and the Canon 400/5.6. Only looking for answer when used with the 5D3 (latest firmware) please. Thanks in advance.