me to take them is on cloudy nights so you aren't "wasting" any time.
</p>
<p>
<blockquote>
The lens caps that come with many cameras let a small amount of light in,
so don't depend on them to block all the light.
Use the lens cap to keep the lens clean, but put a dark towel or something else over the lens.
To be extra careful, only take dark frames at night or in a dark room.
</blockquote>
</p>
<p>
You'll probably want to take dark frames before you install your allsky camera,
especially if the camera will