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[sophiecentaur]

I have a Pentax K10D - brilliant camera!.
I want to do some portraits and I have been looking into suitable flashguns, including a slave.
I can't find any info about using the K10D's flash - except the brief stuff in the handbook.
What do you get when you buy a 'digital flash'? How do I know whether a flashgun will operate with TTL and will slaves do the same? How are slaves controlled - apart from going off when they see a flash?
I have seen slave controllers at ridiculously low prices on Ebay but are they any use? What more do you get for more money?