WolfVision VZ-27 User Manual - Handbuch (Seite 8)

BOTTOM LIGHT / LASER CENTER MARKER (VZ-57)
The LIGHT key (#21) of the VZ-57 and VZ-27 can be used to switch between:
"Top light" (with Synchronized Lightfield)
"Bottom light" (with Laser Center Marker on VZ-57) and
"Light off"
The bottom light should be used for dark transparent materials such as x-rays
or for very small transparent materials such as slides.
Using the bottom light has the disadvantage that the Synchronized Lightfield of
the top light no longer marks the pick-up area of the built-in camera. However
as a substitute the Visualizer VZ-57 has a built-in Laser Center Marker, which marks
the center of the pick-up area. This can also be used for quick positioning of
objects (especially with big enlargements, like when picking up a slide)
WORKING WITH TRANSPARENCIES
MACRO MODE / DIGITAL ZOOM
The working surface of the Visualizer (#9) has a special crystalline white color,
which is especially designed for perfect reproduction of transparencies.
Even though the professional Visualizers have a built-in bottom light it is
recommended to use the top light for transparencies, because of the
better color reproduction and the advantage that the Synchronized Lightfield
still shows the pickup-area of the built-in camera.
However in these situations it is recommended to use the bottom light:
- If the transparency is very dark
- If the transparency is very wavy and causes reflections
- If the room light causes reflections on a transparency
Laser
center
marker
This Laser Center Marker is only visible on the working surface and NOT on the picture the audience sees. For
safety reasons the Laser Center Marker is automatically switched off when the top mirror is tilted to record outside
of the working surface. If required the Laser Center Marker can also be switched off completely in the unit's menu
(see page 14 and on-screen help menu). The Laser Center Marker is not availabe on the Visualizer VZ-27.
In the fully extended position of the arm, the smallest pick-up area is
42 x 33mm (1.6" x 1.3"). When pressing the MACRO key (#18) the
length of the arm is automatically reduced, this allows for greater
enlargements. In the macro mode the smallest pick-up area with full
optical resolution is: 30 x 22mm (1.2" x 0.9"). When zooming in,
the zoom stops at this size. If you press the ZOOM IN key again after
the stop, the unit activates its digital zoom extention. In this mode
you can zoom into a picture as small as 15 x 11mm (0.6" x 0.4").
Please note that the resolution in the digital zoom area is lower!
When the macro mode is activated the MACRO key on the control
panel is illuminated red.
Please note that the macro mode has the following limitations:
- The depth of focus and the object height that can be focused is not as large as in the fully extended arm position.
- The largest pick-up size is only about 42 x 33 mm (1.6" x 1.3").
- When zooming the Synchronized Lightfield stays at a larger size and no longer marks the pick-up area of
the built-in camera. At the VZ-57 the Laser Center Marker (see above chapter) is activated as a substitute.
If sufficient depth of focus and focusing high objects in the macro mode is more important than big enlargements,
it is possible to switch the Visualizer from 12x zoom to 11x zoom in the Visualizer's menu (see page14). The
smallest pick-up size in the 11x macro mode is only 33 x 25mm (1.3" x 1"), but the depth of focus is larger than in
the 12x macro mode.
Please note that for technical (optical) reasons the laser center marker can not show the exact middle center of the
pickup area in every position of the arm. This is not a failure of the unit! However it is always very close to the center.
Laser
center
marker
8