(photography) the apparent displacement of an
object that
results from the
change of perspective with which it is viewed. In photography, the
term directly applies to the
different perspectives of an
object through the viewfinder and camera lens because of their slight distance apart. Such a
parallax error can result in a poorly composed
image or in part of the desired
field of vision being omitted from the
frame.
—SHSBC Binder 31 Approved Glossary