(9) A streak of lesser density through the center of the film may be
caused by curvature of the film in the solution, so that the center portion
floats clear of developer during tray development.
(10) The image may be out of focus for any of the following reasons:
(a) The focusing is incorrect.
(b) The lens elements were not properly in place.
(c) The cut film holder, or pack adapter, was not in register with
the focal plane.
(11) If part of your subject is cut off:
(a) The camera may have been moved before the exposure.
(b) The subject was not properly composed.
(c) The viewfinder is out of adjustment or you didn't correct for
(12) If image is not sharp, any of the following may be the cause:
(a) The subject moved.
(b) The camera moved.
(c) The subject was not properly focused.
d. Chemical negative defects. These defects usually occur during the
processing of the film. They can, however, be caused anytime the film is
allowed to come into contact with some chemical.
plays a large part in the elimination of chemical defects. The following is
a partial list of some of the defects of this nature. Some chemical defects
are caused by a combination of errors, both mechanical and chemical.
(1) If the image of your negative is partially positive, this is due
to reversal of the image and is sometimes caused by hypo in the developer.
More often, it is the result of a brief exposure to white light during
(2) Yellow stains appearing after the negative is dry are caused by
insufficient fixation or the use of an old and exhausted fixing bath.