Article Summary:

A news item at our partner site Digideep states that underwater photographers who work with a Canon EOS Digital Rebel XTi/400D and the eTTL-Converter developed by Heinrichs-Weikamp should NOT yet update the firmware of their camera.  Furthermore, the problem also affects Amphibic eTTL flash guns offered by Subtronic, a manufacturer who installs the converter as an OEM-version in their strobes.  Be sure to see the Digideep article for details, if you have a Rebel XTi/400D.