The answer to this first question is a two-parter, since I have received two different questions about it.
The first question was "is it OK to leave the lens attached to my camera when it's not in use?"
The answer to this one is a very simple yes. It's a fine way to store the lens when it's not in use, and it has the added benefit of protecting your digital SLR sensor from dust.
The second question was "how do you store lenses when they're not attached to the camera?"
The answer to this one is pretty straightforward too: in a closet. I do make sure that the protective caps for my lenses are firmly in place before I put them into storage.
Each lens actually has two protective caps: the lens cap, which protects the glass in the front of the lens, and a screw-on cap that protects the electronics where the lens attaches to the camera.
These electronic sensors help the lens communicate with the camera and are important for features like autofocus, aperture setting and exposure metering.
Typically, I store my lenses upright with both caps attached. If I know that I won't be using a lens for a really long period of time (a rare occurrence) then I will pack the lens back in its original box.
If the manufacturer felt fine storing the lens that way, then I figure it will work for me too.
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