On the other hand, if you find yourself storing your equipment for several months at a time, you might find a nasty surprise under a lens cap one day. The risk of fungus issues increases if you often work in wet, dewey conditions. In a humid environment, gear will accumulate moisture even if kept out of the rain. Putting away equipment in a dark, warm cabinet after such a shoot is a great way to grow some fungi.
What is the optimum humidity for camera storage?
Using a dry cabinet for camera storage is a straighforward process. The amount of work you have to do depends on the type of enclosure you are using. With an active dry box, the only thing you need to do is to set the desired humidity level and let the electronics do their work. Best humidiy level for camera storage is around 40-45%. If you are using a passive dry box, you need to add enough dessicant to keep the humidity close to these numbers.
Too dry can be almost as bad as too humid, which is why using a dry box without means of controlling the actual relative humidity inside is a bad idea. Storing your gear in an enclosure with extremely low humidity will affect rubber parts, leatherette, certain plastics, lubricants and some electronic components. Electrostatic build up is also a danger when humidity is kept too low.