Quote:
Originally Posted by tribalstu
i'v got hold of a 550 ex quite cheap and was planning on using it on my D600 thing is i was trying to set it up for the 2nd curtain flash mode and it don't seem to work?.
is it to old for my new D600?

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Did you mean the 600D (Canon) rather than D600 (Nikon)? If 600D, did you set the 2nd curtain sync on the flash itself (that's where you need to set it).