Thanks Godders. That makes sense, I guess. BTW, I got my Sigma flash back from Sigma for repairs/update. It now works with the K10D for regular ttl flash, but not with the second curtain. However, I don't think this cheaper model had that in the inventory from the beginning. The higher end "deluxe" version does. Sometimes next year I will get a 540 that will work better. Hopefully there will be a firmware update soon that allows using the built in flash for triggering the off camera flash.
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