I spent 3 weeks in Costra Rica a few years ago. I spent a lot of time in 
rain forests, both costal and mountain. In those places nothing was ever 
quite dry. Paperback books left in the book exchange at Rara Avis would 
blow up to 3 times their original thickness just sitting on the shelf 
for a few days. Back in the forest with 1100midity plus drizzle I 
watched a Nik*n have an electronic nervous breakdown, sputtering, 
beeping, clicking, running its motors amok, etc. I doubt if it ever 
recovered.
 I wouldn't tell this story if my OM-2n, OM-1 and lenses hadn't escaped 
unscathed along with some lovely photos. My strategy was lots of medium 
weight zip-lock baggies and lots of little packets of silica gel (much 
info on sources on the list recently). I took one double baggie of 
throughly dried gel packets. Whenever equipment wasn't being used (not 
between every shot!), I put it in its baggie with a gel pack and 
evacuated as much air as possible. The less air, the less moisture for 
the gel to absorb.  When a gel pack lost its drying power (most turn 
blue), I replaced it with one from the master double baggie.
 I never had any condensation or operational problems with camera or 
lens, nor any subsequent fungus problems. The only thing I'd do 
differently the next time is to make sure all my silica gel was the kind 
that changes color when full of moisture. You can just dry the gel out 
again in an oven and reuse it. I was never where I could do that, but 
you may be able to on your trip.
 I'm sure the solution of waterproof boxes works too, but it's so big, 
clumsy and expensive that it doesn't appeal to me. Also, I assume it 
takes much more silica gel (more size and weight), since each opening of 
the box swirls in large amounts of damp air.
Sounds like a great trip. Enjoy yourself throughly!!
Moose
Olympus List wrote:
 I'll be going to Thailand on Monday, then Hong Kong, then Taiwan for a 
full month!!  :-)  What I am concerned is humidity. 
 
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