Title: QDC-CN Module is NOT eTTL-2 compatible
Product review: The Quantaray QDC-CN flash module is NOT compatible with Canon eTTL-2 cameras. It appears to be nothing more than a relabeled QDA-CN module, with some of the wording replaced in the instruction sheet to indicate that it is eTTL-2 compatible. I have now tested it with the original Digital Rebel, the Rebel XT, and the S5-IS - all of which are eTTL-2 cameras. In every case, in every mode, the flash fires only at full strength, which is exactly what Canon describes will happen with incompatible (non-Canon) flashes and is exactly the behavior exhibited by the original QDA-CN module. If Quantaray did, in fact, update the module circuitry, they certainly could not have tested it. This unit is essentially useless.
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