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Thread: When macro lens say 1:1 and min focus distance, does it mean

  1. #1

    Question When macro lens say 1:1 and min focus distance, does it mean

    subject to sensor distance of 30cm? Or the front element of the lens to subject?

  2. #2

    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Quote Originally Posted by dRebelXT
    subject to sensor distance of 30cm? Or the front element of the lens to subject?
    The distance is usually the subject to the film/sensor plane.

  3. #3
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    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Quote Originally Posted by lsisaxon
    The distance is usually the subject to the film/sensor plane.
    I believe so.

    Regards,
    Arto.

  4. #4

    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    1:1 magnification meaning you will get sensor size full frame.

    Focusing distance = distance between the sensor to the object

    Working distance = distance between front tip of the lens to the object
    See my Photo Gallery at the Clubsnap

  5. #5

    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Quote Originally Posted by megaweb
    1:1 magnification meaning you will get sensor size full frame.
    Unless I misunderstand what you're saying this statement is incorrect. 1:1 has nothing to do with sensor size. What it means is that when the lens is in macro setting for 1:1 and the subject is in focus. the size of the subject on the final 100% print will be the same as the original - e.g. you take a picture of a coin at 1:1 and then print the image at 100%, the image of the coin in the picture will be exactly the same size as the actual coin, i.e. life size.
    sk.images, ex - cyber_m0nkey

  6. #6

    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Ok, after reading up, is my understanding correct:

    The 90mm lens achieve 1:1 at closest focusing distance of 30cm(sensor/film to subject), however the lens extend by 9cm and the un-extended lens is 11cm(measure from sensor/film plane). As a result, the lens front is 10cm from subject.

    Assume on a 35mm film.

  7. #7
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    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Sounds cheem. But if u want to go extreme, get the MP-E 65mm f/2.8 Macro Photo.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  8. #8

    Default Re: When macro lens say 1:1 and min focus distance, does it mean

    Quote Originally Posted by cyber_m0nkey
    Unless I misunderstand what you're saying this statement is incorrect. 1:1 has nothing to do with sensor size. What it means is that when the lens is in macro setting for 1:1 and the subject is in focus. the size of the subject on the final 100% print will be the same as the original - e.g. you take a picture of a coin at 1:1 and then print the image at 100%, the image of the coin in the picture will be exactly the same size as the actual coin, i.e. life size.
    You are right that it has nothing to do with sensor size. It also has nothing to do with print size. The 100% (or 1:1) refers to the size of the image at the sensor plane.

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