Added all remaining gists.

convertExposureTime.c/README.md

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+Exposure time conversion between two f-stops.

convertExposureTime.c/convertExposureTime.c

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+/* A function to convert the exposure time between two f-stops.
+ * Usefull for pinhole cameras. See http://www.pinhole.cz/en/pinholecameras/exposure_01.html
+ *
+ * Parameters:
+ *     *) f_from: The f-stop to convert from.
+ *     *) f_to: The f-stop to convert to.
+ *     *) exp_time: The exposure time for the aperture f_from.
+ *
+ * Return:
+ *     The exposure time for aperture f_to.
+ */
+float convertExposureTime(int f_from, int f_to, float exp_time){
+    float aux = (float)f_to / (float)f_from;
+    return time * (aux * aux);
+}