Voici la copie d'une r?ponse du support de Metz ? une de mes question concernant la compatibilit? de mon "vieux" 32 MZ-3 et d'un 20D :

"please note, digital Canon cameras like a 20D are only loaded with a so
called E-TTL MkII flash control which is still not possible with your 32
MZ-3. Also true TTL is no longer provided with a 20D. Therefore your 32
MZ-3 can only be used in simple auto flash mode with manual settings on
a 20D. For a connection of them the adapter SCA3102 version M3 is
recommended.
For flash operation with a 20D we recommend to use either a 54 MZ.. (all
types) with adapter SCA3102 M3 or another 44 AF-4C (re-programmed).
Unfortunately, other flash units like 70 MZ... etc can only be used in
auto flash mode as well."