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Before you press the shutter, cover
the viewfinder eyepiece. This prevents
light reaching the sensor through the
viewfinder and creating fogging or
flare that will spoil your image. Most
modern cameras have a small built-in
metal shutter or a plastic cap that can
be placed over the eyepiece, but a
piece of sticky tape is just as effective
– or you can simply hold your hand
over the eyepiece. However, be
careful not to touch the camera
during long exposures.
Electronic Noise
If your exposures are running to
several minutes, electronic noise
will increase and be visible in your
image. If this causes problems,
most photo-editing software has a
noise-reduction facility, and many
cameras have a long-exposure
noise-reduction feature.
Shooting with Film
When shooting long exposures
with film, you will encounter
reciprocity failure. In basic terms,
this means that beyond a certain
shutter speed, film will underexpose,
therefore your shutter speed will
need to be extended accordingly.
For example, if your shutter speed
with the ProGlass IRND filter in
place is 30 seconds, this may need
to be doubled to one minute if
shooting on film. It can vary from
emulsion to emulsion, however, so
check with the manufacturer of the
film you are using.
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