How long is safe to keep a lens unused.

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ms18
ms18 Veteran Member • Posts: 3,164
How long is safe to keep a lens unused.
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Given the fact one has good dry box and ways to keep fungus out of the way, how long is okay for a autofocus Fuji lens to keep it unused?  Is it not good to keep lens unused for longer time or internal moving parts motor, aperture blades might fail because not using it? 
In that case at least how often I should mount and use it?

Now in the COVID situation I don't use all my lenses. Just want to know how often they must be mounted and used to avoid failure (If there is such thing).

I assume like once a month? Can i keep them stored (in proper way) longer than month? Around how many months?

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