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  • #16
    Thanks, this seems to be a very good resource for how to see light and how the camera sees it.

    I just had a thought; if the shutter speed is kept constant, wouldn't ISO 800 with -2 EV behave the same as ISO 200 with no compensation? Or if my math is wrong, a more general statement; would negative exposure compensation be also achieved by reducing ISO (light sensitivity)?

    My feeling is that if you shoot in manual mode then negative exposure compensation would behave like reducing ISO, but in aperture or shutter priority the camera would insist on calculating the exposure "correctly" based on all settings like SS, ISO, Aperture?

    Obviously you know what you are doing, therefore what am I missing here?
    Zafar
    Nikon D300s, Nikkor 50mm F1.4G, Tamron SP 24-70mm F2.8 VC, Tokina 11-16mm F/2.8, Tamron SP 70-200mm F2.8 VC, Nikkor 18-300mm F3.5-5.6, Nikon SB 900
    Flickr http://www.flickr.com/photos/zafarsami/

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    • #17
      Originally posted by ZafarSami View Post
      My feeling is that if you shoot in manual mode then negative exposure compensation would behave like reducing ISO, but in aperture or shutter priority the camera would insist on calculating the exposure "correctly" based on all settings like SS, ISO, Aperture?
      This is "backwards."
      In full manual mode EC affects nothing except "when" the meter tells you the exposure is correct. The actual exposure is determined by the settings. What the meter looks like in this situation is very dependent on camera make/model.

      In manual mode with auto ISO enabled the camera will change the ISO to get the "correct" exposure based upon the EC setting (Nikons and newer Canons).

      In an auto mode (A/S) the camera will change whatever it has control of to obtain the "correct exposure based upon the EC setting.

      On Nikons in A mode with auto ISO the camera will change the ISO first (based upon the menu settings) and then start to change SS. In S mode with auto ISO Nikons will change the aperture first until it hits the limit, and then it will change ISO.

      Basically, what EC does is tell the camera meter "where" the correct exposure is. For EC to be applied, the camera must have control of a relevant setting (ISO/A/SS)
      Last edited by sk66; 01-21-2013, 07:13 PM.
      Steve
      the Photographic Academy.com
      SharpShooter Industries
      My 500px, My Flickr, My Blog

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      • #18
        Thanks Steve. Got it. Manual mode exposure compensation just adjusts the viewfinder metre's centre point, while in A/S modes will it will apply less or more exposure as you choose compared to the camera calculation.
        Zafar
        Nikon D300s, Nikkor 50mm F1.4G, Tamron SP 24-70mm F2.8 VC, Tokina 11-16mm F/2.8, Tamron SP 70-200mm F2.8 VC, Nikkor 18-300mm F3.5-5.6, Nikon SB 900
        Flickr http://www.flickr.com/photos/zafarsami/

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        • #19
          Thanks Steve.

          ------------------------

          Originally posted by ZafarSami View Post
          Thanks Steve. Got it. Manual mode exposure compensation just adjusts the viewfinder metre's centre point, while in A/S modes will it will apply less or more exposure as you choose compared to the camera calculation.
          This will be camera dependant, as Steve says.
          Last edited by RichardTaylor; 01-21-2013, 08:25 PM.
          Flickr stream.
          http://www.flickr.com/photos/34094515@N00/

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          • #20
            Thanks for this! Very informative thread with really nice pictures. They illustrate the points perfectly.
            Right! I'm off to look at ways to weatherproof my camera so I can head out in the rain.

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            • #21
              Glad to help out.

              Nowdays I use Optech rainsleves, howver you may get by with just an umbrella and/or a plastic bag (and a rubber band or two) with hole in the bottom for the lens to poke through.

              #13
              IMG_1033
              Flickr stream.
              http://www.flickr.com/photos/34094515@N00/

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              • #22
                Can I call dibs on the patent for a small umbrella that slots in the flash shoe? Maybe not...

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