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Focus point indication during playback

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  • Focus point indication during playback

    I am struggling to get any shots in focus when using C-AF and I suspect that I am failing to get the AF point accurately on the chosen subject when I press the shutter button. I thought I would see if I could confirm that was happening by looking at the focus point indication during playback.

    Continually pressing the Info button cycles through various screens on the LCD, one of which shows a small green rectangle on the focusing point on the frame which was selected. However, many of the frames do not have the green rectangle and I am not sure why that is. Does that mean that the camera was not properly focused when I took the shot or is there another reason?

    The green rectangles were rarely on top of the chosen subject, so I seems that my techique is very poor or there is a technical issue with my camera or the setup used. Does anyone have any suggestions as to what is happening?

    Ron

  • #2
    Re: Focus point indication during playback

    Which focus points setting are you using?

    Comment


    • #3
      Re: Focus point indication during playback

      Originally posted by Growltiger View Post
      Which focus points setting are you using?
      My default at the moment is 25 point for C-AF and Single Small for S-AF.

      Ron

      Comment


      • #4
        Re: Focus point indication during playback

        I get this on some of my C-AF sequences of bird flight shots. I assumed it was because the camera did not get focus on any points on some of the shots even if it started with focus. My C-AF release priority setting is off but I think that only affects initial C-AF lock when using sequential-L drive. I am tending to use the 5x5 block as the all-points will more often select off the subject if there is stuff in the background. I also use the focus limit settings to prevent going off-subject with back and foreground stuff.

        I thought the Olympus Workspace / viewer software used to also display the focus points as that is easier than the tiny view you get on the camera playback, but I cannot find this feature in the latest version of Oly Workspace.

        Maybe if you post your settings we can all compare?
        https://www.flickr.com/photos/macg33zr/

        Comment


        • #5
          Re: Focus point indication during playback

          FWIW I've failed to find any way to get Lightroom, Olympus Viewer 3 or Workspace to show the focus point in use.
          I did come across a recommendation for PhotoME on a Flickr group.
          It gives _very_ comprehensive views of the the EXIF data. It also shows the focus point selection on the thumbnail.
          I've not managed to get it to show an enlarged view - I suspect it's using the small JPG thumbnail embedded in the ORF file and can't read the actual ORF data.

          https://www.photome.de/home_en.html
          It's free.
          https://www.flickr.com/photos/amcuk/

          Comment


          • #6
            Re: Focus point indication during playback

            There is an add-in for Lightroom! Though it shows the standard size box for the small focus point.
            I didn’t get where I am today....

            Comment


            • #7
              Re: Focus point indication during playback

              https://github.com/musselwhizzle/Focus-Points
              I didn’t get where I am today....

              Comment


              • #8
                Re: Focus point indication during playback

                Originally posted by BDennis View Post
                Maybe if you post your settings we can all compare?
                Thanks Bill. I posted my settings in another thread, so I have copied them and updated them slightly, as I don't think I have changed much since then.

                C-AF (not tracking); Silent Shutter, Sequential Low 10fps; C-AF Sensitivity +2; 25 focus points or All Points if there is a clear background; S-IS Auto. Default shooting settings: Shutter Priority 1/2000 sec at F5.6. Auto ISO. Range selector switch on lens 4m-∞.

                So, is it the general concensus of opinion that if there is no green rectangle, the camera did not lock focus?

                Ron

                Comment


                • #9
                  Re: Focus point indication during playback

                  OK, geeked out on this now..

                  I've just installed "ExifTool" on my new Mac, exported the EXIF for 2 raw files from a C-AF sequence of some Puffin shots from Bempton last weekend one with a green square and one without a green square. I output the complete EXIF for each ORF to a text file then differenced those files with a software code editor.

                  For ORF with a green square displayed, looking at relevant differences:

                  Code:
                  Drive Mode                      : Continuous Shooting, Shot 29; Electronic shutter
                  Focus Mode                      : MF; C-AF, MF, Imager AF
                  Focus Process                   : AF Used; 64
                  AF Point                        : Unknown (1087)

                  For ORF without a green square displayed:

                  Code:
                  Drive Mode                      : Continuous Shooting, Shot 30; Electronic shutter
                  Focus Mode                      : MF; C-AF, MF, Imager AF
                  Focus Process                   : AF Not Used; 64
                  AF Point                        : Unknown (1341)
                  This seems to imply that AF was not used for Shot 30 in my C-AF sequence as it says "AF Not Used". It does record "AF Point" which has a difference in each case, I'm assuming this is used to display the green squares somehow.

                  I got the EXIF tool here:
                  https://www.sno.phy.queensu.ca/~phil/exiftool/

                  My settings similar to yours except I have C-AF sensitivity at -2 after reading an article by Scott Bourne on the Oly US site. Also face detection off, I had it on accidentally at one point!

                  All the best,
                  --Bill
                  https://www.flickr.com/photos/macg33zr/

                  Comment


                  • #10
                    Re: Focus point indication during playback

                    Originally posted by Walti View Post
                    There is an add-in for Lightroom! Though it shows the standard size box for the small focus point.
                    That's brilliant but sadly not for me

                    Known Issues

                    1 - Not currently working on Windows.
                    https://www.flickr.com/photos/amcuk/

                    Comment


                    • #11
                      Re: Focus point indication during playback

                      Known Issues: "Not currently working on Windows."

                      Bummer.

                      Comment


                      • #12
                        Re: Focus point indication during playback

                        This one claims to work on Lightroom both Mac and Windows.

                        http://www.lightroomfocuspointsplugin.com

                        Disclaimer I have not tried it as I am on a mac but worth a try.
                        Dave

                        My Flickr

                        Comment


                        • #13
                          Re: Focus point indication during playback

                          Originally posted by BDennis View Post

                          My settings similar to yours except I have C-AF sensitivity at -2 after reading an article by Scott Bourne on the Oly US site. Also face detection off, I had it on accidentally at one point!

                          All the best,
                          --Bill
                          I'm surprised you would use -2. This setting means that when the distance changes, it takes just over a second before the camera changes focus.

                          The advantage of -2 is that the subject can go behind an obstacle for a whole second and the camera will pick it up still in focus when it appears again a second later.

                          The advantage of +2 is that the camera always instantly tries to keep the subject in focus. The disadvantage is that if it goes behind an obstacle for even a moment the camera will try to reacquire focus.

                          So you can see why the camera initially defaults to zero, as a compromise (170ms delay). I set mine to +2 and accept the disadvantage, but benefit from it always trying to focus without delay.

                          Here is the table of timings for each setting. The delay is the time it waits before deciding to reacquire focus. Note that it isn't linear.

                          Sensitivity ----- Delay in 1/100 of a second ----- Frames at 18fps
                          +2 ----- 0 ----- 0
                          +1 ----- 5 ----- 1
                          0 ----- 17 ----- 3
                          -1 ----- 67 ----- 12
                          -2 ----- 117 ----- 21

                          Comment


                          • #14
                            Re: Focus point indication during playback

                            Originally posted by Growltiger View Post
                            I'm surprised you would use -2. This setting means that when the distance changes, it takes just over a second before the camera changes focus.
                            Thanks, I didn't know about these timings. I will give it a try the other way.

                            I ended up with -2 after experimentation on small birds like warblers flying around in reedbeds and found it "more sticky" on the subject.

                            There is a blog post by David Tipling where he discusses this same thing here: https://davidtipling.com/f/olympus-e...af-sensitivity

                            It seems like one needs different C-AF sensitivity according to the background (plain sky, trees, reedbeds etc). Hopefully more smarts in the camera will one day be able to do this - plain sky background vs messy stuff ought to be easy.

                            I need to experiment more!
                            https://www.flickr.com/photos/macg33zr/

                            Comment


                            • #15
                              Re: Focus point indication during playback

                              Originally posted by wornish View Post
                              This one claims to work on Lightroom both Mac and Windows.

                              http://www.lightroomfocuspointsplugin.com

                              Disclaimer I have not tried it as I am on a mac but worth a try.
                              Sadly it doesn't appear to support Olympus cameras
                              http://www.lightroomfocuspointsplugin.com/#faq

                              Which camera models are supported by the plugin?

                              Lightroom Focus Points plugin currently works for all past-2002 Canon EOS DSLR and all Nikon DSLR. It was successfully tested with images from the following cameras.
                              Canon: EOS 1D X / 1D C, 1D Mark 4, 1Ds Mark3, 1D Mark3, 1Ds Mark2, 1D Mark2 N, 1D Mark2 - 5D Mark 4, 5D Mark 3, 5D Mark 2, 5D Mark2, 5D, 6D, 7D - 80D, 70D, 60D, 50D, 40D, 30D, 20D, 10D - 700D, 100D, 650D (Rebel T4i), 600D (Rebel T3i), 550D (Rebel T2i), 500D (Rebel T1i), 450D (Rebel XSi) , 400D (Rebel XTi), 350D (Rebel XT), 300D (Rebel), M, EOS 1100D, EOS 1000D. Generally all Canon DSLR, and also most Canon Powershot models, should work fine too.
                              Nikon: D4s, D4, D3S, D3X, D3, D2Xs, D2HS, D2X, D2H, D1X, D1H, D1 - D750, Df, D810, D800, D800E, D700 - D610, D600, D500, D300S, D300, D200, D100 - D7200, D7100, D5600, D5500, D5300, D5200, D5100, D7000, D5000, D90, D60, D40X, D80, D70s, D50, D70 - D3300, D3200, D3100, D3000, D40. Nikon 1 (mirrorless) series (1J1, 1J2, 1J3, 1J4, 1V1, 1V2, 1V3, 1S1, 1S2, 1AW1, 1J5) are also supported. Sony (new): Sony A77ii (beta)

                              https://www.flickr.com/photos/amcuk/

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