Doug Kerr said:Hi, Robert,
The EOS 20D is not prepared to operate external non-dedicated flash units in a 2nd curtain sync mode.
There is a setting for 2nd curtain sync in the custom functions (CF15=1) but that only is effective for Canon Speedlite flash units.
Chuck Westfall(Canon USA) said:Hi, Robert:
As I said, no EOS camera supports second-curtain sync directly with studio strobes. Canon's EX Speedlites, especially the 430EX are a lot lighter than your Metz, so they might be more appropriate for this purpose.
Director/Media & Customer Relationship
Camera Marketing Group/Canon U.S.A., Inc.