mechanics.html

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	<a href="https://amsikking.github.io/">Home page</a>
	<h1>amsikking: Microscope objectives</h1>
	<a href="./index.html">Index</a>

	<h2>Mechanics</h2>
	<p>
	For integration purposes the physical size and shape of an
	objective may be important. Due to the popularity of using 
	different objectives on the <em>same</em> instrument, the 
	major manufacturers tend to standardize the 
	<em>mounting threads</em> and <em>parfocal distance</em> 
	(i.e. the distance from the objective <em>flange</em> to 
	the image plane):
	</p>

<table style="text-align:center">
  <tr><th>Make</th>		<th>Standard thread</th>	<th>Parfocal distance (mm)</th>	</tr>
  <tr><td>Leica</td>	<td>M25x0.75</td>			<td>45</td>       				</tr>
  <tr><td>Mitutoyo</td>	<td>M26x36TPI</td>			<td>95</td>     				</tr>
  <tr><td>Nikon</td>	<td>M25x0.75</td>			<td>60</td> 					</tr>
  <tr><td>Olympus</td>	<td>W20.32x0.706 (RMS)</td>	<td>45</td> 					</tr>
  <tr><td>Zeiss</td>	<td>M27x0.75</td>			<td>45</td> 	 				</tr>
</table>

	The major manufacturers now release detailed 2D drawings 
	which can be used to produce 3D CAD models if needed. For
	example here's a drawing for the Ninon 100x1.35 Silone
	objective:

	<figure>
    <img src="figures/Nikon_MRD73950_mechanics.png" alt="Nikon_MRD73950_mechanics.png">
    <figcaption>
	</figcaption>
	</figure>

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