Nikon 35MM Film Scanner LS-10E - Manual (Page 74)

[b]
Fig. 4.16 Non-flat film
Film incurvé
Nicht planliegender Film
[c]
Fig. 4.17 Optimizing focus for a section of non-flat film
Mise au point optimisée sur un film incurvé
Für einen Teil eines nicht planliegenden
Bildes optimierte Fokussierung
Non-flat film
The film surface is not necessariiy flat. It may be curved
for a number of reasons. If the film is not flat, the
scanner can not 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 used in slide projectors before
scanning. The heat of the projection bulb will cause the
film in the slide to bow. This is shown in Figure 4.16.
[a] Non-flat film
[b] Cross section of slide mount
It is therefore necessary for the user to compromise on
the focus based on the area of the slide being scanned.
If only a section of the film is scanned, it may be
possible to adjust the focus to best suit the area of the
film being scanned. This is shown in Figure 4.17.
[c] Non-flat film
[d] Optimized focus position
[e] Normal detent focus
[f]
Cross section of slide mount
Glass mounts can be used to help flatten non-flat film.
The fine focus control
The fine focus control is located on the front of the
scanner as shown in Figure 4.18. This knob can be
easily adjusted with the thumb. A center detent is
provided to center the film in the field of focus. Rotating
the knob in either direction will affect the focus.
[g] Focus control
A scan is taken in the field of interest at maximum
resolution. The result is displayed in a window on the
screen. The user can see the result of changing the
focus control as the scan is taken. Refer to the manual
focusing explanation in the driver manual for the correct
control.
4-5 Calibration
[g] The scanner is self-calibrating. A calibration procedure
occurs automatically during power-up. This procedure
typically takes about thirty seconds. It is possible to
force a calibration through software. This may be
advantageous immediately before an important scan.
Due to the patented light source, there is no warm up
time necessary for the scanner. Once the scanner has
performed its power-on calibration, it is ready to go.
Fig. 4.18 The focus control on the scanner
La mise au point sur le scanner
Die Feinfokussierung am Scanner
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