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<!-- comment -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Microscope objectives: Tube lens</title>
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<body>
<section>
<a href="https://amsikking.github.io/">Home page</a>
<h1>amsikking: Microscope objectives</h1>
<a href="./index.html">Index</a>
<h2>Tube Lens</h2>
<p>
An infinity corrected objective needs an extra lens to form a finite image,
often referred to as a 'tube lens'. In principle, any positive lens will work.
However, in practice some care should be taken to ensure that the chosen
tube lens can accommodate the pupil size (\(D_{BFP}\)) and the field of view
(\(FOV\)) that the objective delivers (as well as the wavelength range and
any final aberration corrections that may required). A useful reference is
the manufacturer recommended tube lens, summarised below for the most
popular manufacturers:
</p>
<table style="text-align:center">
<tr><th>Make</th> <th>Part #</th> <th>f (mm)</th> <th>FN (mm)</th><th>EPD (mm)</th> <th>Lambda (nm)</th> <th>Inf. correction</th></tr>
<tr><td>Leica</td> <td>?</td> <td>200</td> <td></td> <td></td> <td></td> <td>Partial</td></tr>
<tr><td>Mitutoyo</td> <td>MT-1</td> <td>200</td> <td>30</td> <td>24</td> <td>436 - 656</td> <td>?</td> </tr>
<tr><td>Nikon</td> <td>MXA20696</td> <td>200</td> <td>26.5</td> <td>32</td> <td>400 - 700</td> <td>Full</td> </tr>
<tr><td>Olympus</td> <td>SWTLU-C</td> <td>180</td> <td>26.5</td> <td>36</td> <td>400 - 700</td> <td>Full</td> </tr>
<tr><td>Zeiss</td> <td>?</td> <td>165</td> <td></td> <td></td> <td></td> <td>Partial</td> </tr>
</table>
<p>
Here the <em>field number</em> (\(FN\)) is (in theory!) the field of view over
which the tube lens (and maybe the objective!) can deliver diffraction limited
performance (for a small enough pupil \(D_{BFP}\)). Note that the entrance pupil
diameter (\(EPD\)) may cause vignetting (or the tube lens aberrations) for
large enough pupils.
</p>
<figure>
<img src="figures/objective_tube_lens.png" alt="objective_tube_lens.png">
<figcaption>
(<a href="figures/objective_sketches.odp">.odp sketch</a>)
</figcaption>
</figure>
</section>
</body>
</html>