Differences

This shows you the differences between two versions of the page.

--- en:photo:equipment:canon-ef-24-105 [2011/02/13 12:20]
alex created
+++ en:photo:equipment:canon-ef-24-105 [2011/11/10 01:31] (current)
alex [LensFun Calibration Data]
@@ Line 2: / Line 2: @@
 {{:en:photo:equipment:canon-24-105mm-f4-is.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''.  Values below only tested on camera with crop factor of 1.6.
+<code>
+    <lens>
+        <maker>Canon</maker>
+        <model>Canon EF 24-105mm f/4L IS USM</model>
+        <mount>Canon EF</mount>
+        <cropfactor>1.0</cropfactor>
+        <calibration>
+            <distortion model="ptlens" focal="24" a="0.017263" b="-0.049244" c="0" />
+            <distortion model="ptlens" focal="28" a="0.010878" b="-0.024454" c="0" />
+            <distortion model="ptlens" focal="35" a="0.007152" b="-0.009799" c="0" />
+            <distortion model="ptlens" focal="50" a="0.002502" b="0.004803" c="0" />
+            <distortion model="ptlens" focal="70" a="0" b="0.009685" c="0" />
+            <distortion model="ptlens" focal="88" a="0" b="0.008781" c="0" />
+            <distortion model="ptlens" focal="105" a="0" b="0.009598" c="0" />
+            <!-- manually selected compensation values -->
+            <tca model="linear" focal="24" kr="1.000300" kb="1.000300" />
+            <tca model="linear" focal="28" kr="1.000400" kb="1.000300" />
+            <tca model="linear" focal="35" kr="1.000400" kb="1.000300" />
+            <tca model="linear" focal="50" kr="1.000100" kb="1.000100" />
+            <tca model="linear" focal="70" kr="1.000000" kb="1.000000" />
+            <tca model="linear" focal="88" kr="0.999900" kb="0.999800" />
+            <tca model="linear" focal="105" kr="0.999800" kb="0.999800" />
+        </calibration>
+    </lens>
+    <lens>
+        <maker>Canon</maker>
+        <model>Canon EF 24-105mm f/4L IS USM</model>
+        <mount>Canon EF</mount>
+        <cropfactor>1.6</cropfactor>
+        <calibration>
+            <distortion model="ptlens" focal="24" a="0.00552" b="-0.02074" c="0" />
+            <distortion model="ptlens" focal="28" a="0.00396" b="-0.01457" c="0" />
+            <distortion model="ptlens" focal="35" a="0.00091" b="-0.00171" c="0" />
+            <distortion model="ptlens" focal="50" a="0.00077" b="0.00096" c="0" />
+            <distortion model="ptlens" focal="70" a="0.0016" b="5e-05" c="0" />
+            <distortion model="ptlens" focal="88" a="0.00467" b="-0.00624" c="0" />
+            <distortion model="ptlens" focal="105" a="0.00797" b="-0.01307" c="0" />
+            <!-- manually selected compensation values -->
+            <tca model="linear" focal="24" kr="1.000300" kb="1.000300" />
+            <tca model="linear" focal="28" kr="1.000400" kb="1.000300" />
+            <tca model="linear" focal="35" kr="1.000400" kb="1.000300" />
+            <tca model="linear" focal="50" kr="1.000100" kb="1.000100" />
+            <tca model="linear" focal="70" kr="1.000000" kb="1.000000" />
+            <tca model="linear" focal="88" kr="0.999900" kb="0.999800" />
+            <tca model="linear" focal="105" kr="0.999800" kb="0.999800" />
+        </calibration>
+    </lens>
+</code>
 ===== Links =====