Get some silica gel desiccants, they are cheap on Ebay, or you get them even if you didn't want to by buying something... They come in the "DO NOT EAT - THROW AWAY" packets. You can reuse them -- just place them in oven at 100 deg.C or more for some time, or some people use even a microwave oven but I haven't tried that. They usually have an indicator color, for example: blue<->transparent or orange<->green for dry<->wet. Something like this: Keep them in a zip-lock bag, put a few grains in the film canister every time and feel safe! When you run out or if the moisture gets in your desiccant bag, then heat them up to release the moisture and here you go again.

Even though you probably won't have a problem at 60% RH.