Eyepiece Reticles from Graticules Ltd.
Asbestos fiber analysis
SPI Supplies offers the full range of
eyepiece reticles from Graticules Ltd. designed for asbestos fiber analysis.
In general, the total magnification of your light microscope can be
determined by simply multiplying the objective power by that of the eyepiece.
For example:
| Objective |
Eyepiece |
Total Magnification |
| 20x |
10x |
200x |
For most applications, especially with modern optics, this is sufficient.
However, where actual size is critical, it is often times necessary to
modify the dimensions, so when ordering an eye piece reticle, the following
information is needed:
- A calibration factor
- Objective magnification
- Eyepiece magnification
- Reticle diameter
- Make and model of microscope
To calibrate the instrument, fit the microscope with an eyepiece scale and
appropriate stage micrometer by Graticules Ltd.
Compare the length of the stage micrometer with the eyepiece scale.
An exact calibration factor can be determined.
Example Calculation:
Using a 40x objective lens, a circle in the eyepiece requires a diameter of
4000 µm (4 mm) to coincide with or read a 100 µm circle on the stage. The
factor is therefore defined as 4.
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Tuesday September 30, 2008
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