I just got a Canon 30D with Ikelite housing and a DS-160 strobe. Every time the strobe should fire I get an error99 code. What is going on?
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Err99 is Canon's code for "other error". It is generally a camera error.
There is nothing about a DS-160 that I am aware of that would cause that.
Is it safe to assume that you do not get it with your 30D at any other time?
Did you try to attach a hotshoe flash?