3 Replies Latest reply: Mar 4, 2014 2:59 PM by elie-d RSS

    Understanding Exposure slider and stops?

    Picturequest Community Member
    Picturequest Mar 4, 2014 11:15 AM

      I recently shot a multi exposure pano to stitch. You are suppose to shoot manual so the exposure settings are the same. But I didn't this time. I shoot Ap priority so my shutter speed changed, i.e.:

       

      1/250

      1/125

      1/80

       

      If I want to match each exposure to say the 1/80 exposure, how do I determine how much of the exposure slider equals 1 stop?

       

      do the numbers on the slider relate to specific exposure increments?

       

      Thanks

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        • 1. Re: Understanding Exposure slider and stops?
          99jon Community Member
          99jon Mar 4, 2014 11:52 AM (in response to Picturequest)

          You can use the buttons in Quick Develop in the Library for relative exposure adjustments. The outer buttons are for one stop and the inner buttons for one third.

           

          Use two thirds for 1/125 to 1/80

          Use one plus two thirds for 1/250 to 1/80

           

          This assumes aperture and iso were the same for all three shots.

          • 2. Re: Understanding Exposure slider and stops?
            Ian Lyons CommunityMVP
            Ian Lyons Mar 4, 2014 1:39 PM (in response to Picturequest)

            You might want to try the Match Total Exposure command.

             

            To make the exposure on a series of images appear more consistent, select the images in filmstrip. The image with the target exposure (one that please you most) should be the “most selected”, then choose "Settings > Match Total Exposures” in the Develop module. This command looks at the overall brightness and contrast of image (also some additional camera settings such as ISO and shutter speed settings) and tries to match the series to the most selected image.

            • 3. Re: Understanding Exposure slider and stops?
              elie-d Community Member
              elie-d Mar 4, 2014 2:59 PM (in response to Picturequest)

              In P.V. 2012 (LR4 and LR5) you cannot equate Exposure slider movements to in-camera exposure changes because the latter is a linear shift of luminosity and LR Exposure is applied on a curve, affecting primarily mid-tones and tapering off at the high end. Moreover, it is not even a fixed and predictable curve, but rather "auto-adaptive", altering the roll-off according to the value of the original white point. In P.V. 2010 (and 2003), however, Exposure was linear and Brightness applied the curve and the option to revert to P.V. 2010 processing does exist in any 2012 edition.