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--- en:photo:equipment:canon-ef-50-f1.8 [2011/05/13 20:03]
alex created
+++ en:photo:equipment:canon-ef-50-f1.8 [2011/11/10 01:31] (current)
alex [LensFun Calibration Data]
@@ Line 1: / Line 1: @@
-====== Canon EF 50mm f/1.8 II Lens ======
+====== Canon EF 50mm f/1.8 MkII Lens ======
 {{:en:photo:equipment:canon-50mm-f1.8.jpg?400&direct|}}
+===== LensFun Calibration Data =====
+This is my [[http://lensfun.berlios.de/|LensFun]] entry for this lens.  The distortion values listed are the default values that are included with the library.  Unfortunately, following the [[http://lensfun.berlios.de/lens-calibration/lens-calibration.html|lens calibration guide]], I was unable to get ''tca_correct'' to output anything meaningful.  Most of the values were far off the scale that ufraw could deal with (ufraw/lensfun wants +/- 0.01 but I was geting +/- 0.5 or more).  I just ended up manually selecting values for first order correction, producing a much better result than I could get from ''tca_correct''.  This lens did not appear to need any TCA correction anyway, interestingly enough.
+<code>
+    <lens>
+        <maker>Canon</maker>
+        <model>Canon EF 50mm f/1.8 MkII</model>
+        <mount>Canon EF</mount>
+        <cropfactor>1.3</cropfactor>
+        <calibration>
+            <distortion model="ptlens" focal="50" a="-0.00016" b="-0.003951" c="0" />
+            <!-- manually selected compensation values -->
+            <tca model="linear" focal="50" kr="1.000000" kb="1.000000" />
+        </calibration>
+    </lens>
+</code>
 ===== Links =====