LAMY - HOW IT WAS MADE
This photo was taken during late twilight.The exposure was about 5 minutes
long. The red streaks are car tail lights passing by on US 285.
I actually stopped several exposures
midway and started again only after oncoming cars had passed by. It is possible
to put the cap back on your lens and then remove it during long exposures
to keep unwanted cars, planes, etc. from exposing on your film. Beware, there
are several things that could happen while using this technique: every time
you touch your camera while the shutter is open you risk moving it, and stars
that are bright enough to expose on film will have a gap in their trails during
the time the lens cap is in place.