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<div id="projectname">lensfun
 <span id="projectnumber">0.3.2.0</span>
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<div class="title">Adding new cameras to the database </div> </div>
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<div class="textblock"><p>Adding new cameras is very easy. You just have to know its crop factor, and the EXIF identification strings for this camera; that's all.</p>
<p>If you don't know the crop factor, you can search in google for e.g. “Nikon D300 sensor size”. Let's suppose you found out that your sensor size is 23.6 × 15.8mm. Now compute the length of the diagonal using Pythagora's theorem:</p>
<p class="formulaDsp">
\[ d = \sqrt{23.6^2 + 15.8^2}\,\mathrm{mm} = 28.4\,\mathrm{mm} \]
</p>
<p>Now you just divide the magic number 43.27 (the diagonal of a usual 35mm film frame) by the number you got:</p>
<p class="formulaDsp">
\[ \mathrm{cropfactor} = \frac{43.27}{28.4} = 1.523 \]
</p>
<p>Now you must find out the identification string for your camera from EXIF data. For this you can use the exiv2 script:</p>
<pre class="fragment"> $ exiv2 blah.nef
....
Camera make : NIKON CORPORATION
Camera model : NIKON D300
....
</pre><p>Now you can create a XML entry for your camera:</p>
<pre class="fragment"> <camera>
<maker>Nikon Corporation</maker>
<maker lang="en">Nikon</maker>
<model>Nikon D300</model>
<model lang="en">D300</model>
<mount>Nikon F AF</mount>
<cropfactor>1.523</cropfactor>
</camera>
</pre><p>Now add this definition to a XML database file along Lensfun database search path and your camera will be detected and Lensfun will work properly with images produced by it.</p>
<ul>
<li>
<a class="el" href="el_camera.html">Declaring cameras: <camera></a> </li>
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