Sunny 16...

Discussion in 'Photography Beginners' Forum' started by JeffieLove, Apr 4, 2010.

  1. JeffieLove

    JeffieLove TPF Noob!

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    Let's talk about this sunny 16 rule....

    I have tried it a few times outside... around noon-2 in the afternoon ... Sun high in the sky and unobscured... Aperture set to 16, ISO to 100, Shutter to 1/100... All my shots come out underexposed...

    Why?
     
  2. Dominantly

    Dominantly TPF Noob!

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    Your camera is broke.:er:

    Examples?
     
  3. JeffieLove

    JeffieLove TPF Noob!

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    i deleted them because they looked like poo! lol...

    I will do some tomorrow...

    but whenever I do it, my light meter says -2... and blinks... which means severely underexposed ;) lol
     
  4. usayit

    usayit No longer a newbie, moving up!

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    The sunny 16 rule was more accurate in the film days... Digital cameras and their sensors are not completely accurate.

    EOS 450D

    Looks to me that the XSi 100 might be measured at a lower ISO across the range.
     
  5. Derrel

    Derrel Mr. Rain Cloud

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    According to the DXO Mark measurements, the XSi has inaccurate ISO settings, which is a very easy way for a manufacturer to skew the noise results favorably, by mis-labelling the ISO values, and deliberately keeping the ISO levels lower than specified, as Canon does with the XSi, calling an 1165 ISO "1600", and calling an ISO 303 "400",etc. This practice of some manufacturers is according to dPreview's testing department.

    Question for you JeffieLove: did the pictures look badly underexposed on the computer, or just on the back of the camera? I mean, you said they looked like "poo"; the discrepency between the XSi's real, tested ISO level and its stated ISO is not terribly bad at ISO 100.

    And, the second question--why not use the light meter?
     
  6. Dominantly

    Dominantly TPF Noob!

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    I had mentioned the rule to her as a quick an easy way to getting your starting point when shooting on Sunny days.

    Even more then the light meter, I rely on the Histogram to show me whats really going on. The LCD is useless in a sunny environment, and depending on what and how you're meter, you can still be mislead. If you just expand the view on the LCD to shot histogram after every shot, then you can see where your shots are leaning in the spectrum.
     
  7. IgsEMT

    IgsEMT No longer a newbie, moving up!

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    Historam is nice but on Bright or Dark scenarios it'll mislead you by showing tour either Over or under. It's a good tool though to use. Don't forget to use highlight priority or "blinkies" as they r commonly called ;)
     
  8. usayit

    usayit No longer a newbie, moving up!

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    The easiest solution is to figure out by how much your camera is under-rating the ISO specified and compensate. I use a hand-held meter a lot and before I figured this out it would drive me absolutely NUTS! I used to put a label on the camera somewhere indicating how much to compensate.

    You'll have to do that for each and every camera... individually. My M8 is spot on. My Samsung/Pentax GX-1L is under. My Canon 1DMII is close enough.. I think 1/3 stop under. I need to figure out my Panasonic G1 which is still new to me. According to the DXO mark website, its over but I was under exposing yesterday... could be user error or the fact that I was shooting through glass and fencing yesterday at the zoo.


    btw... one of the neat things about the G1 that I had not realized until yesterday is that the EVF can be used to examine the image just took. This means you can look at the picture and histogram through the viewfinder even on the brightest of days without even moving the camera away from your eye. Neat!
     
  9. JeffieLove

    JeffieLove TPF Noob!

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    So now I am curious. If your camera is 1/3 stop under dies that mean you are generally going to want to shoot with the light meter 1/3 stop to the right?

    Forgive me for the idiot question. I've been awake for 10 minutes and my brain isn't quite working yet.
     
  10. Dao

    Dao No longer a newbie, moving up!

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    I think you may not really need to worry about it too much. Just use the in-camera light meter for your shots. Check the histogram(s) afterward if needed.

    If the camera meter say you need EV13, just set your camera settings accordingly. i.e. ISO100, f/5.6 and 1/250.
     
  11. usayit

    usayit No longer a newbie, moving up!

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    hahaha lol. yes... Dao's suggestion is the easiest solution. My suggestion is assuming you want to use a meter other than what is internal to the cameral.

    Yes... If your camera is consistently underexposing by 1 stop, then you can compensate by over exposing 1 stop over what your external meter is reporting. In my case, I would set my handheld meter to ISO 160 when my Pentax is set to ISO 200 so I don't have to figure things out in my head on the fly.
     
  12. JeffieLove

    JeffieLove TPF Noob!

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    Yeah dao, I haven't figured out all that ev stuf yet....
     

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