I have a film project later in the year that will require ambience recording in Samoa in high humidity - I'd appreciate any advice of potential issues from any similar experiences?
I live in Florida, so I'm close to an expert on this...
I know that Schoeps stuff doesn't like humidity. Starts making this high pitch "whining" noise that won't stop till you blow dry them off.
MKH416s, 816s, 800s are all great in humidity. Ric Viers has a video where he literally has water condensing on a Rode NTG3 and it still worked great (NTG3 sounds a lot like a 416).
The biggest thing you want to do is let your mics warm up (like you would a camera or your eye glasses). If you go from cold AC to hot and humid, you'll get condensation. Let the mics warm up for a while before you plug them in, or you might have some problems. Bring some towels with you to wipe down the outside of the mics in cases of extreme condensation.
In most cases, mics are fairly resilient to humidity (especially dynamics). What mics will you be using?
My MKH 418s works great under harsh humidity. Used it in South East Asia, South Africa, and it seemed to hold up beautifully.