the ratio

Discussion in 'Beyond the Basics' started by grooski, Jul 20, 2004.

  1. grooski

    grooski TPF Noob!

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    I've herd about macro and the ratio like 1:1 or 1:3. But what does it meen?
     
  2. Soulreaver

    Soulreaver TPF Noob!

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    1:1 means that the size of the image on the negative is the same size as the subject, that is, a picture of a bee 1:1 would be life size on the neg, as opposed to 1:3, where it would be 1/3 lifesize.
     
  3. grooski

    grooski TPF Noob!

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    so where would the focal length come in with the ratio
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I think the ratio is a result of the focal length combined with how close the lens can focus.

    You could do macro with a 100mm lens or a 300mm lens. You could get the same ratio depending upon how close the lens is able to focus.
     
  5. ksmattfish

    ksmattfish Now 100% DC - not as cool as I once was, but still

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    Focal length comes into play with how close you have to get to the bee to get that 1:1

    It might only be a few inches, but with bees, spiders, poisonous snakes, etc... that might be a big deal.

    I'm sure it also affects the macro subject similarly as focal length affects non-macro shots. Wider lenses will exagerate distances between near and far objects, and long lenses will flatten the image.
     

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