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An elementary question on overlap

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  • #16
    Re: An elementary question on overlap

    In fact as far as I understood the crop factor is the ration between 36mm and the horizontal dimension of the sensor.
    I guess I can make the sensor dimension to be visible and possible to be documented, so that the focal length written will not have to be recalculated.
    What do you think about this approach ?
    My blog : Aslan Resimler

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    • #17
      Re: An elementary question on overlap

      I just have verified the formulas and it possible to make the modification in the file to fit any camera.
      I will just add the horizontal and vertical sensor size input and remove the comment on focal length.
      That means, after documenting the sensor size, you will just have to tell what focal length you use, without any crop factor.

      I am going to do that immediately and post the new file.
      My blog : Aslan Resimler

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      • #18
        Re: An elementary question on overlap

        Originally posted by YvesG View Post
        In fact as far as I understood the crop factor is the ration between 36mm and the horizontal dimension of the sensor.
        The crop factor is usually taken to be the ratio of the diagonal sizes.

        John

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        • #19
          Re: An elementary question on overlap

          No problem.
          In fact with the formulas I use, I just need the sensor size now.
          I have modified the file, so that you can document it freely and it is now on line.

          Panorama calculator for all

          I hope it will work correctly.
          My blog : Aslan Resimler

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          • #20
            Re: An elementary question on overlap

            Originally posted by John Houghton View Post
            The crop factor is usually taken to be the ratio of the diagonal sizes.

            John
            I have read my book again about photographic mathematics and I confirm that :
            the crop factor is the ratio between 36mm (argentic) and the larger size (width) of the sensor, not the diagonal.
            My blog : Aslan Resimler

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            • #21
              Re: An elementary question on overlap

              And here is what I found that puts me back to the beginning of the way to calculate crop factor :

              Some camera companies use the diagonal field of view measurement method. That is, if they describe a camera as having a particular 35mm equivalent focal length, it means the camera produces the same field of view along the diagonal as a 35mm camera with a lens having the stated focal length.

              Other companies use the horizontal field of view rather than the diagonal field of view. This produces a slightly different result from using the diagonal because the aspect ratio of the digital image (usually 4:3) is different from the aspect ratio of 35mm film images (exactly 3:2). When a digital camera produces the same horizontal field of view as a 35mm camera with a lens having a particular focal length it actually has a larger diagonal field of view.





              At the end, it is not an issue as formulas are based on sensor size and not the crop factor.
              But I am still questionning myself on what is the official definition (not wikipedia).
              My blog : Aslan Resimler

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              • #22
                Re: An elementary question on overlap

                Originally posted by YvesG View Post
                No problem.
                In fact with the formulas I use, I just need the sensor size now.
                I have modified the file, so that you can document it freely and it is now on line.

                Panorama calculator for all

                I hope it will work correctly.
                great thanks.

                Nick
                Fanotec
                We listen. We try harder.

                Comment


                • #23
                  Re: An elementary question on overlap

                  Concerning crop factor :

                  For a sensor that has the same format ratio than 24x36, you can use either the diagonal or the width of the sensor to calculate this ratio. It is giving the same result.
                  For other formats, you have to consider the width and not the diagonal.

                  So, as a general rule, to calculate the crop ratio, you should apply : Crop ratio = 36 / Sensor width(mm)
                  My blog : Aslan Resimler

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                  • #24
                    Re: An elementary question on overlap

                    I have just reworked the results presentation area in order to simplify the reading.
                    I hope it will bring something and that you will like it.


                    My blog : Aslan Resimler

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                    • #25
                      Re: An elementary question on overlap

                      Originally posted by YvesG View Post
                      I have just reworked the results presentation area in order to simplify the reading.
                      I hope it will bring something and that you will like it.


                      That is a nice tweak!
                      THx

                      Nick
                      Fanotec
                      We listen. We try harder.

                      Comment

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