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is the LUmix 12-35mm parfocal?

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    is the LUmix 12-35mm parfocal?

    Another thread for a different question: Is the Lumix 12-35mm 2.8 parfocal?
    Catherine Stratton

    Stratton Films

    catherine@strattonfilms.com
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    #2
    My understanding is that no it is not.

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      #3
      The Lumix 12-35 is parfocal, at least mine seems to be. The Lumix 35-100 is definitely not.

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        #4
        These lenses are not parfocal mechanically. However, when used on a camera with an active mount, the system "remembers" focua and resets it as you change focal length. It can take a second or two for the lens to catch up. It's not perfect, but it works, and considering the small size, weight and constant f2.8 maximum aperture of these things they are very useful lenses on the AF100.

        I might add that they are very sharp at f2.8 - 5.6, better than many lenses I've adapted from still cameras, including Leica-R. The 35-100 is slightly soft in the corners at about 70-100, but in most cases that's more of a problem with stills than video. my only complaint is the manual focus and iris adjustment on the 35-100 is more spongy feeling than the 12-35, which is pretty responsive. With AF, which I seldom use but have tested, both lenses work well.

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          #5
          Originally posted by Mac View Post
          These lenses are not parfocal mechanically. However, when used on a camera with an active mount, the system "remembers" focua and resets it as you change focal length.
          Thanks for the clarification, I figured if they were genuinely parfocal Panasonic would have sold them as such. Nice to know in practice this isn't such as issue.

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            #6
            Thank you for your replies.
            Catherine Stratton

            Stratton Films

            catherine@strattonfilms.com
            www.strattonfilms.com
            www.facebook.com/strattonfilms
            www.vimeo.com/strattonfilms
            www.linkedin/in/cathstratton

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              #7
              I should mention, although it's obvious, that these two lenses together cost nearly as much as the current bargain prices on the AF100. And unfortunately they're not useable on other cameras except the GHs... If you have a BMDCC in your future, they won't work with the current model (which no one can get yet anyway) becuase it's passive. I invested in them along with two Noktons hoping for a significant update to the Panasonic MFT line.

              STOP, I'm not starting another bitch session about the AF!... but it important to know the limitations.

              Comment


                #8
                *** Remember : Panasonic released a firmware update for both the 12-35mm and the 35-100mm lenses in December 2012 ***

                Lumix Customer Support ( links to firmware udpates on this page )

                Comment


                  #9
                  Originally posted by TheDingo View Post
                  *** Remember : Panasonic released a firmware update for both the 12-35mm and the 35-100mm lenses in December 2012 ***

                  Lumix Customer Support ( links to firmware udpates on this page )
                  Has anyone done the update? I didn't hear about the firmware update before now. Add this to the weekend to do list.

                  I love both of these lenses a lot. But then I also have a GH3 so I get more use from them. It would have been great if they made these with video in mind more but I guess you cant have it all.
                  Last edited by Erik Naso; 02-08-2013, 01:20 PM.
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                    #10
                    Originally posted by Erik Naso View Post
                    Has anyone done the update? I didn't hear about the firmware update before now. Add this to the weekend to do list.

                    ...I also have a GH3...
                    Erik,

                    I updated both lenses via the GH3. Was quick & simple.

                    Best,
                    B

                    Comment


                      #11
                      Does this firmware fix the exposure stutter upon zooming in the 12-35? That's the one thing that kills it for me on this lens - I very much need to do slow zooms for a project, and with the flicker I can't use the 12-35. Also, I assume that the 14-35 f/2 Olympus doesn't have such a flicker - I may have to go for it, even though I lose 2mm on the wide end.

                      Comment


                        #12
                        Originally posted by OldCorpse View Post
                        Does this firmware fix the exposure stutter upon zooming in the 12-35?
                        Officially the firmware updates are for improvements with the AF speed, but sometimes other things get bundled in too.


                        ...For the exposure stutter problem, what's the simplest way to reproduce this?

                        i.e. Just zoom at any aperture and it should show up? ( I haven't spent much time using the zoom while filming, so I haven't noticed exposure stutter yet )

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                          #13
                          Originally posted by TheDingo View Post
                          For the exposure stutter problem, what's the simplest way to reproduce this?

                          i.e. Just zoom at any aperture and it should show up? ( I haven't spent much time using the zoom while filming, so I haven't noticed exposure stutter yet )
                          Erik Naso describes it here, including a video of the test - basically, just slow zoom:

                          Lumix 12-35 G X Vario F2.8 OIS Lens Review.

                          Comment


                            #14
                            Originally posted by Mac View Post
                            And unfortunately they're not useable on other cameras except the GHs... I invested in them along with two Noktons hoping for a significant update to the Panasonic MFT line...
                            STOP, I'm not starting another bitch session about the AF!... but it important to know the limitations.
                            Mac (and Catherine)-food for thought regarding purchasing Lumix (or any M4/3) lenses---
                            Even if these lenses don't work for your (or others) post-AF100 future, just in the sheer numbers of GH1/2/3s sold, there should be great resale value in M4/3 glass, even if there's not a vast array of cameras using them.

                            Comment


                              #15
                              It is my understanding that the 12-35 and the 35-100 are parafocal, meaning that once you focus on the telephoto end of the lens that it will stay in focus at any focal length as you zoom back out. I know they can briefly lose focus on a whip zoom but otherwise the focus will hold. If anyone can clarify please do so.

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