Reply To: For the wedding people – Highest ISO you'll safely go?

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That’s a hard question to answer. It depends upon the camera used, your personal taste for noise (some see tiny bits and freak out and some see tons and don’t care), whether you’re printing or not (by extension how the final product will be viewed), the quality of light under which you’re shooting and probably some other factors too.
That all said, I shoot with a 5D3 and don’t want to spend a significant amount of time processing but still need decent output so, I personally am happy to shoot to 1600, am comfortable at 3200, if I must will do 6400 and reserve 12800 for extreme situations and have never gone higher nor will I. As others say, exposing properly and a little to the right always helps. Unfortunately, it’s not just noise that appears at high iso. You also lose colour and DR so again, exposure is critical.