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The original is imaged 2␣ :␣ 1 in the intermediate
image plane of the microscope. A distance of
e. g. 5 mm in the slide overlay is enlarged to
10 mm in the intermediate image plane of the
microscope.
The overlay is only possible in beamsplitter
position 50/50 (switch rod) in the middle position
of the tube (FSA 25 PE).
The framed slide is inserted in the fitted slide
holder (74.6), with the lettering on the white side
of the slide facing the lamp.
The slide holder can be adjusted on all sides, so
that the overlay can be positioned anywhere in
the microscope image. Remember that when
you move the slide, the overlay in the image will
move in the opposite direction. This takes a bit
of getting used to.
The white line pattern can be given a coloured
background by inserting 32 mm colour filters in
the filter slot (74.7).
Slide overlay device
The slide overlay device is used for reflecting
measurement and comparison patterns, µm
marks, marker arrow, company logo and quality
data etc. into the microscope image so they
appear on the photograph.
Slides with the following line patterns are
available:
Marker arrow
Measurement
scale 10 mm = 100 divisions
µm marks for 2.5x – 100x objectives
10 x 10 mm grid division
You can make your own masks with any meas-
urement and comparison line patterns, quality
data, company logos, etc.
The original master has to be copied on a 35 mm
negative, i. e. white line patterns on a dark back-
ground, preferably using fine-grain document
film, and then framed in a customary 50 x 50 mm
slide frame.
Operation of the slide overlay device