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    #1

    Magnification ratios

    I've noticed before with my Olympus 4/3 lenses that many telephoto lenses of equal focal length do not give equal magnification of a given subject at equal distance - my 75-300 @ 300mm was as near as I could estimate to my 300mm f2.8. However my Leica 14-150mm @ 150mm gave noticeably lower magnification than the 75-300 @ 150mm. Now I have discovered that my Canon 55-250mm STM @ 250mm produces considerably greater magnification than the Tamron 16-300mm @ 300mm!

    I've yet to compare both plus the 400mm f5.6 L with my Sigma 150-600mm Sport which will be interesting. It appears that what is "written on the tin" is not always what's in it, so who can we trust and where can we find out the true focal length values of a lens? Not the manufacturer's info obviously!

    David
    PBase Galleries:-http://www.pbase.com/davidmorisonimages


    Canon 7D II, Sigma 150-600mm Sport, Sigma 18-300mm, Sigma 8-16mm, National Geographic Expedition Carbon, Lensmaster RH1 Gimbal.


    "It is better to light a single candle than curse the darkness" - Confucius (551–479 BC)
    Tags: None
    #2
    Re: Magnification ratios

    Are we talking about different cameras with different sensors here? - That could explain a lot! Olympus/Leica/Canon?

    Comment

      #3
      Re: Magnification ratios

      Focus breathing?

      Comment

        #4
        Re: Magnification ratios

        Interesting article
        How Does Your Camera's Sensor Size Affect Your Photographs?
        http://www.lightstalking.com/cameras-sensor-size/
        Camera sensors come in different form factors nowadays, ranging from medium format, to Micro Four Thirds, and even smaller in the point-and-shoot cameras,
        Canon 5D3, 7D2, 60D, Canon 70-200L f2.8 IS II, Canon 300 f4L IS, Canon 16-35 f4 L, Canon 24-105mm f/4L IS USM, Canon 1.4 MkIII extender, Sigma AF 10-20mm f/3.5 EX DC HSM, Sigma 150-600 Contemporary, Tamron SP AF 70-300 F/4-5.6 Di VC USD, Canon EF-S 18-55mm 1:3.5-5.6 IS
        https://www.flickr.com/photos/16830751@N03/

        Comment

          #5
          Re: Magnification ratios

          Originally posted by collywobbles View Post
          Are we talking about different cameras with different sensors here? - That could explain a lot! Olympus/Leica/Canon?
          I am only comparing different lenses on one camera - Olympus and Leica on Olympus EM1 and Canon and Tamron on Canon II. Different makes at the stated same focal length at the same distance on the same subject with the same sensor give different magnification ratios - why?

          David
          PBase Galleries:-http://www.pbase.com/davidmorisonimages


          Canon 7D II, Sigma 150-600mm Sport, Sigma 18-300mm, Sigma 8-16mm, National Geographic Expedition Carbon, Lensmaster RH1 Gimbal.


          "It is better to light a single candle than curse the darkness" - Confucius (551–479 BC)

          Comment

            #6
            Re: Magnification ratios

            Originally posted by DrJon View Post
            Focus breathing?
            What is that please?

            David
            PBase Galleries:-http://www.pbase.com/davidmorisonimages


            Canon 7D II, Sigma 150-600mm Sport, Sigma 18-300mm, Sigma 8-16mm, National Geographic Expedition Carbon, Lensmaster RH1 Gimbal.


            "It is better to light a single candle than curse the darkness" - Confucius (551–479 BC)

            Comment

              #7
              Re: Magnification ratios

              Focus breathing is a term used to describe a shift in focal length when you alter the focus distance. This normally takes place at near focus distances.
              Regards
              Lez

              5Ds // 5D Mark III //               7D Mark II // 16-35 f4L // 24-70 f2.8L II //               24-105 f4L II // 70-200 f4 L // 70-200 f2.8 Lis II // 50 f1.2L // 85 f1.8 //100 f2.8Lis // 200 f2.8L // 300 f4Lis // 1.4ex // .......... and a longer wish list

              Comment

                #8
                Re: Magnification ratios

                "Focus Breathing" - generally a lens' focal length tends to reduce the closer you focus. The current Nikon 70-200 f2.8 was particularly famous for this, since at minimum focus distance and set to 200mm it was only about 135mm (IIRC the Canon 70-200 f2.8 II is about 185mm at closest focus and 200mm).

                Comment

                  #9
                  Re: Magnification ratios

                  Thanks.

                  David
                  PBase Galleries:-http://www.pbase.com/davidmorisonimages


                  Canon 7D II, Sigma 150-600mm Sport, Sigma 18-300mm, Sigma 8-16mm, National Geographic Expedition Carbon, Lensmaster RH1 Gimbal.


                  "It is better to light a single candle than curse the darkness" - Confucius (551–479 BC)

                  Comment

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