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playground:exposure_to_the_right_ettr [2014/01/25 10:12] – mgrantplayground:exposure_to_the_right_ettr [2014/01/25 12:14] – mgrant
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-====== Exposure to the right (ETTR) ======+====== Auto Exposure to the right (ETTR) ======
  
-Exposure to the right (ETTR) is a technique of setting the exposure of a scene such that few or no pixels are are over exposed (blown out) thus maximizing the information captured without loosing information to over-exposure.  This may produce a darker image but this can be corrected later in post processing.  The exposure curve is thus as far to the right as possible without it being clipped.+Automatic Exposure to the Right (ETTR or AETTR) is a technique of setting the exposure of a scene such that few or no pixels are are over exposed (blown out) thus maximizing the information captured without loosing information to over-exposure.  This may produce a darker image but this can be corrected later in post processing.  The exposure curve is thus as far to the right as possible without it being clipped.
  
 For more information on ETTR, see these articles on Luminous Landscape:  For more information on ETTR, see these articles on Luminous Landscape: 
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 The first method involves taking 2 images.  A photo is taken then ETTR looks at it and it modifies the exposure for the next photo.  There are two ways to use this method: **Always on** and **Auto snap**.  The Always on setting sets the ETTR for the next photo on //every photo// you take for the next photo.  The Auto snap setting takes a photo, calculates the ETTR, and then if necessary takes the second photo immediately.   The first method involves taking 2 images.  A photo is taken then ETTR looks at it and it modifies the exposure for the next photo.  There are two ways to use this method: **Always on** and **Auto snap**.  The Always on setting sets the ETTR for the next photo on //every photo// you take for the next photo.  The Auto snap setting takes a photo, calculates the ETTR, and then if necessary takes the second photo immediately.  
  
-The second method uses the live view momentarily to run through a series of exposures until the exposure is correct without taking a photo.  You then take the photo.+The second method uses the live view momentarily without taking a photo.  You then take the photo.
  
 ETTR sets the shutter speed and ISO.  It does not change the aperture setting thus not altering the depth of field of the scene. ETTR sets the shutter speed and ISO.  It does not change the aperture setting thus not altering the depth of field of the scene.
  
-==== The Settings ====+====== The Settings ======
  
 In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR: In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR:
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 **Shadow SNR limit**: 2  Is defined in EV levels of noise form 1 to 4 EV.  The higher the SNR the less noise.  Typical settings from 2 to 4 EV.  For a Timelapse we recommend 2 or 3. **Shadow SNR limit**: 2  Is defined in EV levels of noise form 1 to 4 EV.  The higher the SNR the less noise.  Typical settings from 2 to 4 EV.  For a Timelapse we recommend 2 or 3.
  
-==== The Advanced settings ====+====== The Advanced settings ======
  
 {{:playground:aettr0.jpg|}} {{:playground:aettr0.jpg|}}
playground/exposure_to_the_right_ettr.txt · Last modified: 2014/01/25 12:23 by mgrant