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    #16
    Re: Extender help needed

    I'm surprised it won't fit on the tamron 150-600 dave ,as there made like the sigma to fit canon full frame .the only trouble you have there is the camera won't A/F with it fitted .
    Looking at your lenses as well I don't think any of them will give you A/F on your 750D with a t.c fitted

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      #17
      Re: Extender help needed

      Dave read the link I put up, the L lenses have a recess that the canon converter fits into, it won't fit onto lenses not on that list unless you put an extension between them
      Canon 1DX, 50D, EF500 F4.0 L, EF100-400 f/4.5-5.6L I , EF100-400 f/4.5-5.6L II, EF70-200 f/2.8L II, EF180 f3.5L Macro, EF 24-105 f/4L, EF17-40 f/4L, EF2.0X III, EF1.4X III, 430EX II, MR-14EX...

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        #18
        Re: Extender help needed

        I use the Kenko HD 1.4 extender with my Canon 70-300mm L lens regularly with no problems.
        Canon 6D; Canon 760D;Canon G15;Canon 40mm f2.8(Pancake);Canon 50mm f1.8(ii); Canon 17mm-40mm f4L;Canon EF-S 10-18mm f4.5-5.6 IS STM;Canon EF-S 55-250mm f4-5.6 STM lens;Canon 24mm-105mmf4L IS;Canon 70-300mm f4-f5.6 L IS USM;Kenko 1.4x HD TC;Canon 430EX ii flash;Giottos tripod;Manfretto monopod;Cokin P filters + bits and pieces!

        www.flickr.com/photos/nathaniel3390

        North Wales where music and the sea give a great concert!

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          #19
          Re: Extender help needed

          Originally posted by Nathaniel View Post
          I use the Kenko HD 1.4 extender with my Canon 70-300mm L lens regularly with no problems.
          nat it's all to do with the max aperture of the lens and with the cameras .it really is a suck it and see with any camera/lens/t.c combo. Also it appears that certain cameras having blocking software installed to stop the use of third party t.c's
          Last edited by the black fox; 21-02-2017, 20:54.

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            #20
            Re: Extender help needed

            Camera/TC/lens combinations all very variable. The Kenko 1.4 wouldn't a/f with the 70D and Sigma 150 - 600 C, so I had hopes when I got the 80D as it is an F8 focussing camera, but all I get is an error message. TC works fine with all other bodies and lenses though, great for making the 105 mm F 2.8 macro into the equivalent of a 150 mm F4 macro.
            EOS 6D, 6D Mk II, 80D, 70D, 100D, 200D, M50, M100. Canon 10-18, 18 - 55, 55 - 250 IS STM lenses, Canon 16 - 35 mm F4L, 35 mm EF-S macro, 50 mm F1.8 STM, 60 mm EF-S macro, MPE-65 macro, 85 mm F1.8, 200 mm F2.8 L II, M 15 - 45 mm, M 22mm F2, M 32mm F1.4. Sigma 24 - 35 F2 Art, 135 mm F1.8 Art, 17 - 50 F2.8 DC, 105 mm OS macro, 100 - 400 C, 150 - 600 C.

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              #21
              Re: Extender help needed

              I have a 760D which I use with the Kenko 1.4 plus 70-300mmL lens for my wildlife pictures and it regularly auto focuses from f8 up to f11. No problem at all. See attached picture

              IMG_1772 by Nathaniel Ramanaden, on Flickr
              Last edited by Nathaniel; 22-02-2017, 09:18.
              Canon 6D; Canon 760D;Canon G15;Canon 40mm f2.8(Pancake);Canon 50mm f1.8(ii); Canon 17mm-40mm f4L;Canon EF-S 10-18mm f4.5-5.6 IS STM;Canon EF-S 55-250mm f4-5.6 STM lens;Canon 24mm-105mmf4L IS;Canon 70-300mm f4-f5.6 L IS USM;Kenko 1.4x HD TC;Canon 430EX ii flash;Giottos tripod;Manfretto monopod;Cokin P filters + bits and pieces!

              www.flickr.com/photos/nathaniel3390

              North Wales where music and the sea give a great concert!

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                #22
                Re: Extender help needed

                Nat, what you set the aperture to, whether it be F8, F11, F16 or whatever, has no effect at all on the autofocus. What counts is the wide open aperture as autofocus always takes place with the lens wide open. It only closes down a split second before you fire the shutter.

                With an F5.6 aperture and a 1.4X TC, that makes the wide open aperture equivalent to F8. In theory according to Canon only a few cameras should be able to autofocus at F8, but as you and I have both discovered that's not always the case, for example the 55 - 250 STM will autofocus even at 250 mm with cameras which Canon say shouldn't do so. But it doesn't apply to all body and all lens combinations, it's a case of try it and see.
                EOS 6D, 6D Mk II, 80D, 70D, 100D, 200D, M50, M100. Canon 10-18, 18 - 55, 55 - 250 IS STM lenses, Canon 16 - 35 mm F4L, 35 mm EF-S macro, 50 mm F1.8 STM, 60 mm EF-S macro, MPE-65 macro, 85 mm F1.8, 200 mm F2.8 L II, M 15 - 45 mm, M 22mm F2, M 32mm F1.4. Sigma 24 - 35 F2 Art, 135 mm F1.8 Art, 17 - 50 F2.8 DC, 105 mm OS macro, 100 - 400 C, 150 - 600 C.

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                  #23
                  Re: Extender help needed

                  I use a 1D iv with a mark i 100-400L f4-5.6 with a Canon 1.4 mark ii and have had no problem with auto focussing, as has been said, maybe the body lets me get away with it.
                  Hanging on in quiet desperation is the English way

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                    #24
                    Re: Extender help needed

                    I use a 1D iv
                    All of the "single number" cameras can a/f at F8 max aperture, officially only the 80D of the others can do so .......... though some other combinations can work in practice.
                    EOS 6D, 6D Mk II, 80D, 70D, 100D, 200D, M50, M100. Canon 10-18, 18 - 55, 55 - 250 IS STM lenses, Canon 16 - 35 mm F4L, 35 mm EF-S macro, 50 mm F1.8 STM, 60 mm EF-S macro, MPE-65 macro, 85 mm F1.8, 200 mm F2.8 L II, M 15 - 45 mm, M 22mm F2, M 32mm F1.4. Sigma 24 - 35 F2 Art, 135 mm F1.8 Art, 17 - 50 F2.8 DC, 105 mm OS macro, 100 - 400 C, 150 - 600 C.

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                      #25
                      Re: Extender help needed

                      With Canon extenders the situation is clear - if the body is not F8 enabled for AF then the camera will not event try to focus if the effective maximum aperture of the combination exceeds f5.6. As I understand it Canon extenders report the effective aperture to the cameras firmware which causes the AF to be disabled automatically. With many (most?) third party converters I suspect that the converter merely passes the actual aperture of the lens to the camera rather than the effective aperture thus fooling the camera into not disabling the AF.

                      As an example I have two Kenko 2x converters; the basic MC7 and the Pro-300 (which is white a la Canon). I discovered that when coupled to my 70-200 f4L the Pro-300 the camera will not even try focus while with the basic MC7 it does, albeit rather slowly and hesitantly. On further investigation it seems that the Pro-300 also reports the effective maximum aperture as f8 while the MC7 says it's f4.

                      This said the situation is confused a little by the fact that both converters will allow AF when coupled to an original EF 70-210 f4 which suggests that the lens may also play some part in determining whether the set aperture or the effective aperture is used.
                      Last edited by El Sid; 22-02-2017, 12:40.
                      Nigel

                      You may know me from Another Place....

                      The new ElSid Photogallery...

                      Equipment: Far too much to list - including lots of Nikon...

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                        #26
                        Re: Extender help needed

                        My theory is and it's all that it is a theory .is that canon have starting putting in some form of software blocker into there latest bodies myself and Steve Dawes can both verify that we have had t.c problems with 7D2 and 80D bodies and t.c,s when using the sigma sports lens.

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                          #27
                          Re: Extender help needed

                          My theory is ............ canon have starting putting in some form of software blocker into there latest bodies
                          If that were the case, I'd expect the problems to arise with all lens and TC combinations. The Kenko works fine with all of my lenses and bodies (including 80D) except for the 150 - 600.
                          EOS 6D, 6D Mk II, 80D, 70D, 100D, 200D, M50, M100. Canon 10-18, 18 - 55, 55 - 250 IS STM lenses, Canon 16 - 35 mm F4L, 35 mm EF-S macro, 50 mm F1.8 STM, 60 mm EF-S macro, MPE-65 macro, 85 mm F1.8, 200 mm F2.8 L II, M 15 - 45 mm, M 22mm F2, M 32mm F1.4. Sigma 24 - 35 F2 Art, 135 mm F1.8 Art, 17 - 50 F2.8 DC, 105 mm OS macro, 100 - 400 C, 150 - 600 C.

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                            #28
                            Re: Extender help needed

                            And there's the crunch Richard ,it's showing up on the new bodies ,my kenko HD worked fine with the sigma lens on the 1d3 but not on the 80d or 7d2 ,the 80d/7d2 with sigma 150-600 will not work with a canon mkiii tc but will work with a canon mkii .my feeling is there's something in the electronics blocking the combos .now using the 80d with the dedicated sigma tc and it works fine

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                              #29
                              Re: Extender help needed

                              If there was something in the body, would it not also affect the Sigma 105 macro plus Kenko as well on the 80D? Has anybody seen any problems apart from with the 150 - 600? Haven't heard of any ..........
                              Mind you, I can barely hold the 150 - 600 still and on target as it is at 600 mm, without the extender as well, so not a great loss to me.
                              EOS 6D, 6D Mk II, 80D, 70D, 100D, 200D, M50, M100. Canon 10-18, 18 - 55, 55 - 250 IS STM lenses, Canon 16 - 35 mm F4L, 35 mm EF-S macro, 50 mm F1.8 STM, 60 mm EF-S macro, MPE-65 macro, 85 mm F1.8, 200 mm F2.8 L II, M 15 - 45 mm, M 22mm F2, M 32mm F1.4. Sigma 24 - 35 F2 Art, 135 mm F1.8 Art, 17 - 50 F2.8 DC, 105 mm OS macro, 100 - 400 C, 150 - 600 C.

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