Nikon LS-10 Installation Guide for Macintosh - Manual (Page 56)

Ckapter 4 Basic Operation
Emulsion Side of the Film
As you learned in a previous section, the two sides of the film are not the same.
One side is the emulsion side, and the opposite side is known as the base. In order to
achieve maximum definition, the emulsion side needs to be face up when inserted into
Coolscan.
Non*flat Film
The film’s surface is not necessarily flat. It may be curved, or
buckled,
due to age
and storage conditions. If the film’s surface is not flat, the scanner cannot accurately
focus on the entire film surface at the same time. The most common cause of non-flat
film is
bowing,
caused by heat. This often occurs when slides are stored for several years
under poor conditions. This phenomenon is shown in Figure 4.18.
Base
Figure 4.18 Non-flat film.
35mm film always buckles towards the emulsion, as shown in these illustrations.
In the case of non-flat film, it is therefore necessary to compensate in the focus,
based on the area of the slide being scanned. By scanning only a section of the film, it
may be possible to adjust the focus to best suit the film being scanned. This is shown in
Figure 4.19.
Figure 4.19 Optimizing focus for a section of non-flat film.
Nikon
Coolscan Installation Guide for Macintosh Page 49