Nikon DS-Ri2 Інструкція з експлуатації - Сторінка 22
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Adjusting the exposure time
An exposure time in the range of 60 ms to 4 ms is appropriate for a normal image capturing. Adjust the light intensity
for the microscope using an ND filter to get an appropriate exposure time.
While automatic exposure is selected, the camera gain and the exposure time are automatically changed to obtain an
appropriate exposure. For this reason, a weak light intensity causes a high camera gain making the image coarse,
and a long exposure time making the focusing difficult.
ND filter
An ND filter is a filter that affects only the amount of light passed, not the color balance of the light. For
example, an "ND2" filter cuts transmitted light in half, while an "ND16" filter reduces transmitted light to 1/16th
of actual levels.
4.2.2
Type of F-mount Adapter and Field of View
4.2.2
Field of view (or angle of view) and image resolution depends on the type of F-mount adapter used to add the product to a
microscope or other optical device as shown in the table below.
Adapter type
DS-F
F mount adapter
(direct attachment type)
DS-F2.5
F mount adapter 2.5x
4.2.3
Calculating the Display Magnification for Microscopic Observation
4.2.3
The table below shows the pixel size (the maximum number of pixels stored) of image pickup device and the effective area
(area for the effective number of pixels stored) of this product.
Pixel size (m)
Width
7.3
Use the following formula for calculating the magnification of the subject on the monitor.
Magnification on the monitor
Optical magnification (objective lens magnification relay lens magnification)
Chapter 4
Field of view
A square
inscribed in a
16-mm/
22-mm/25-mm
- diameter circle
A rectangle
inscribed in
a17-mm-
diameter circle
Recorded pixel count
Height
Width
7.3
4908
Diagonal size of monitor display
Diagonal size of effective area for image pickup device
Capturing Images
Aspect ratio
Max. resolution
1608 x 1608
1 : 1
2136 x 2136
2424 x 2424
Approx.3 : 2
4908 x 3264
Height
Width
3264
35.8
12
Purpose
High sensitivity,
minimum noise imaging
High resolution imaging
Effective area (mm)
Height
Diagonal
23.8
43.0