Ikelite DS-125 update needed for eTTL
I own two DS-125 Ikelite substrobes and want to use them on my Ikelite house for the Canon 10D with eTTL. These substrobes have a serial number far below 2500 and according to Ike's site the need a $150 update each to operate with eTTL, a lot off money and that's without the transport to the Netherlands.
So because of that I want to know, is it really needed? I did some test above water and it looks working. I can use TTL, manual and ajust the power. Also did a test underwater, short one because 4 degrees isn't very nice, and again looks nice. Little but because the pictures needed some adjustment (to dark). I shot with f19 en f22 shutter at 1/200 (Av) substrobe can then be already at maximum power?? Wasn't the right way to test.
Who can tell me more about this? Any experience with the same combination? Maybe Ike?
Is it that the old DS-125 works with the eTTL but doesn't give a right exposure without the modification or is there more?
Gr. Mike.