Differences

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--- en:photo:equipment:canon-efs-10-22 [2011/02/13 11:50]
alex
+++ en:photo:equipment:canon-efs-10-22 [2011/11/10 01:30] (current)
alex [LensFun Calibration Data]
@@ Line 2: / Line 2: @@
 {{:en:photo:equipment:canon-10-22mm.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''.
+<code>
+    <lens>
+        <maker>Canon</maker>
+        <model>Canon EF-S 10-22mm f/3.5-4.5 USM</model>
+        <mount>Canon EF-S</mount>
+        <cropfactor>1.6</cropfactor>
+        <calibration>
+            <distortion model="ptlens" focal="10" a="0.005371" b="-0.018303" c="0" />
+            <distortion model="ptlens" focal="12" a="0.002619" b="-0.009527" c="0" />
+            <distortion model="ptlens" focal="14" a="0.002896" b="-0.00705" c="0" />
+            <distortion model="ptlens" focal="17" a="0.005115" b="-0.010326" c="0" />
+            <distortion model="ptlens" focal="20" a="0.00512" b="-0.008414" c="0" />
+            <distortion model="ptlens" focal="22" a="0.002769" b="-0.004058" c="0" />
+            <!-- manually selected compensation values -->
+            <tca model="linear" focal="10" kr="1.000300" kb="1.000700" />
+            <tca model="linear" focal="12" kr="1.000200" kb="1.000600" />
+            <tca model="linear" focal="14" kr="1.000200" kb="1.000600" />
+            <tca model="linear" focal="17" kr="1.000200" kb="1.000500" />
+            <tca model="linear" focal="20" kr="1.000200" kb="1.000400" />
+            <tca model="linear" focal="22" kr="1.000200" kb="1.000400" />
+        </calibration>
+    </lens>
+</code>
 ===== Links =====
   * [[wp>Canon EF-S 10-22mm lens]]
+  * [[http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup/ef_s_10_22mm_f_3_5_4_5_usm|canon.com: Canon EF-S 10-22mm f/3.5-4.5 USM]]