Voici ce que l'on peut lire sur le site de gadget infinity

Tested with the following flash models:
Cactus AF45, KF36;
Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX II, 430EX, 430EZ, 420EX, 420EZ, 380EX;
Metz 58AF, 48AF;
Nikon SpeedLite SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24;
Olympus FL-50R, FL-50, FL-36R, FL-36;
Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT;
Sigma EF-530 DG Super, EF-530 DG ST (for Nikon only), EF-500 DG Super, EF-500 DG ST (for Nikon only), EF-430;
Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AF, 344D, 333D;
Vivitar 285HV, 285, 283, DF-400MZ, DF-340MZ;
Some buyers reported to us that they experienced banding issue with Canon 5D and/or Panasonic Lumix DMC-G1 when using Cactus V4. Similar issue was NOT found in Canon 5D Mark II and other DSLR camera models. (Update 29/6/2010 – This issue has now been fully resolved. All Cactus V4 sent after 21 June 2010 should no longer cause banding issues with Canon EOS 5D or Panasonic Lumix DMC-G1.)

Pour moi le cactus V4 fonctionne avec le sigma DG 530 super.