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--- camera_help [2018/07/07 12:37] – [file_man.mo] walter_schulz
+++ camera_help [2018/09/18 17:24] – [Zebras] Fixed raw underexposre, add dual-ISO note. Audionut
@@ Line 504: / Line 504: @@
 **Raw zebra underexposure**
-You may adjust thresholds for underexposure and overexposure, or you can
+  * OFF - 0EV <> +4EV
-disable zebras while recording. Note: when using the Technicolor
-CineStyle picture style, luma will have values between 16 and 255;
+This allows you to choose at what exposure the underexposure zebras will be displayed.  0 EV means that the zebras will be displayed where the amount of noise in the image, is equal to the amount of signal in the image (the noise floor).
-therefore, you will have to set the underexposure threshold to 16 or
+A general consensus among photographers, is that the limit for acceptable amount of noise in images, is 2 EV above this noise floor.
-greater.
+**NOTE:**
+Dual ISO zebras:  When using dual ISO, there are dual exposures and the zebras reflect this.  With dual ISO there are two types of zebras.
+  * Full/solid zebras which work exactly like normal zebras, and describe overexposure in both ISOs.
+  * Half/stripe zebras which represent overexposure only in the higher ISO.
@@ Line 1346: / Line 1351: @@
     * Best Focus
     * Slit-Scan:
-    * Full-res:
+    * Full-res: Silent pic covering full sensor area.
+Limits:
+FRSP is not made for short exposures. You will get overexposured pictures if you insist on using short shutter settings.
+If you use minumum exposure time (1/4000 or 1/8000) you will get a gradient. (Example: 5D3 gets 1/33.19 at the frame's top and 1/6.30 at the bottom).
+D, 550D and 600D are limited to exposure times up to 0.8 seconds. Other cams can do 15 seconds.
+Tips:
+You have to enable Expo Override to change aperture. Or use manual lenses.
+ETTR works best with Intervalometer. Set ETTR option "Always On". Adjust aperture or use ND filter to get exposure times above 0.5 seconds. Otherwise results may be impossible to deflicker in postprocessing. Don't forget Silent pic and Intervalometer are using the same default trigger. Change Intervalometer trigger to "Leave menu" to avoid this.
+Source: https://www.magiclantern.fm/forum/index.php?topic=12523.msg143510#msg143510
 > OBSOLETE? Silent Pic Hi-Res: