Explaining aspect ratio...

Discussion in 'Beyond the Basics' started by Artemis, Dec 20, 2005.

  1. Artemis

    Artemis Just Punked Himself

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    Ive never understoon what macro aspect ratio is...could someone explain it?
     
  2. Digital Matt

    Digital Matt alter ego: Analog Matt

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    Macro aspect ratio?

    Aspect ratio is the ratio between the width and height. It's the same no matter what focal length your using, or what magnification.
     
  3. Artemis

    Artemis Just Punked Himself

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    then...when a lens says an aspect ratio of 1:1 or 1:3...whats it saying?
     
  4. zedin

    zedin TPF Supporters Supporting Member

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    Thats the ratio of size of image on film to size of acutal object. A 1:1 means the image size is just as big as the actual object. A 1:2 means the image on the film is half the size of the acutal object.
     
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  5. Digital Matt

    Digital Matt alter ego: Analog Matt

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    Sorry Arty, I didn't understand what you were asking. Zedin explained it. It's the "magnification" ratio.
     
  6. Artemis

    Artemis Just Punked Himself

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    Its still really hard to undertand...but I think i got it, ty Zedin :)
     
  7. Kent Frost

    Kent Frost TPF Noob!

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    Let's put it like this. Let's say you take a photo of a penny using a macro lens. If the macro lens says 1:1, that means that the image of the penny on the negative (or sensor) will be lifesize. If it says 1:2, it will be half lifesize. If you go the other way and it says 2:1, it will be double lifesize.
     
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  8. 'Daniel'

    'Daniel' TPF Noob!

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    It's essentially basic fractions. Put the left number on top of the top and it gives you the magnification.

    1:2 - 1/2 half magn.

    4:1 - 4/1 4 times magnification.
     
  9. Artemis

    Artemis Just Punked Himself

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    But what is half lifesized? im lost how it cant be lifesized...
     
  10. zedin

    zedin TPF Supporters Supporting Member

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    lifesized or half lifesized refers to the actual image on the negative.

    If you took a picture of a 5mm*5mm square then on the actual negative the image of the square would be 5mm*5mm if you shot at a 1:1 ratio. If you shot at a 1:2 ratio the square on the film would measure 2.5mm*2.5mm.
     
  11. 'Daniel'

    'Daniel' TPF Noob!

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    If its 1:1 then its like a mirror except it doesn't flip the image. Half life size is if its 5mm tall in real life and is the focal distance away then the image will be 2.5mm on the film.
     
  12. Kent Frost

    Kent Frost TPF Noob!

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    1:2 (which is the same as saying 1/2) is half lifesize. If you took a picture of a penny (as mentioned), 1:2 means that the penny would be half actual size on the negative or sensor.
     

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