Mirror Position Affects Aspect Ratio

Discussion in 'Canon EOS Digital SLRs' started by Rich M, Dec 3, 2022.

  1. Rich M

    Rich M New Member

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    EOS70D
    I’m shooting a copy stand project of thousands of pages from an old diary. You can see examples of this work HERE.

    I’m using the remote app so I can trigger the shutter with my phone. That app provides the option of shooting with the mirror up or down. I have the camera set to shoot in 4x3 mode, because that best fits the size of the diary pages I am shooting. If I shoot with the mirror up, I get a 4x3 image. However, if I set the camera to shoot with the mirror down, I get a 16x9 image. Why?

    Is this something I can prevent?
     

  2. johnsey

    johnsey Site Moderator Staff Member Site Supporter

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    I wonder if this is a bug in the IOS app?? Both of these are non- standard ratios for the sensor. The mirror lockup has not limitation to the image capture ratio according to the manual. Shooting raw will always be the standard 2:3, so I have never tested aspect rations, also I use the wireless remote and have never installed the phone app.
     
  3. Caladina

    Caladina Well-Known Member

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    Nice work on the diaries Rich.
     
  4. Rich M

    Rich M New Member

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    Johnsey, I got the answer. Check page 181 in the manual. It seems that when shooting in Live View (mirror up) the camera defaults to the 3x2 aspect ratio, regardless of what the camera is set for. The 4x3 aspect ratio is an option in the setup menu.

    Caladana, thanks for the kind words.
     
  5. johnsey

    johnsey Site Moderator Staff Member Site Supporter

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    That makes sense if your using live view as well, I was also a bit confused since you mentioned 16:9 not 2:3. I knew something was missing in the equation.
     
  6. Rich M

    Rich M New Member

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    Equipment:
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    The camera will shoot stills at the 16x9 aspect ratio if you want it to. That is one of the setup choices.
    HD video is also a 16 x 9 aspect ratio.
     

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