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Thread: Canon 70-200 mkII + 2x extender question

  1. #1

    Default Canon 70-200 mkII + 2x extender question

    Hi people, I was experimenting with a 500mm mirror lens last night, and it jitters like mad when I'm focusing. End up 1 shot marginally ok while the rest were just out of focus.

    I have a 70-200 and was toying with the idea of getting a 2x extender. Like to ask if anyone has tried and does the focusing jitter a lot at 400mm?

    Thanks in advance.

  2. #2
    Moderator Octarine's Avatar
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    Default Re: Canon 70-200 mkII + 2x extender question

    What do you mean by 'jitter'? The image shaking in viewfinder? Well, that's pretty normal since the narrow field of view amplifies the slightest movement of the camera / lens system. AFAIR, the 500m mirror lenses are manual focus lenses, it's pretty normal that the image 'jitters' while you focus and touch the lens.
    But then: is your tripod / tripod head stable enough?
    If you want to use this physically longer lens of 70-200 with extender then do consider a tripod collar balance the camera / lens setup.
    EOS

  3. #3

    Default Re: Canon 70-200 mkII + 2x extender question

    Yep, it jumps around in the view finder.

    I use a old manfrotto tripod/head combi that's been quite stable, sufficient to handle heavier setups, so I'm guessing it's not the factor.

    Thanks for helping me to frame the question, due to the narrow FOV, will the 70-200/2x extender combi also be as jittery?

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    Moderator Octarine's Avatar
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    Default Re: Canon 70-200 mkII + 2x extender question

    Quote Originally Posted by cokezerodrinker View Post
    Thanks for helping me to frame the question, due to the narrow FOV, will the 70-200/2x extender combi also be as jittery?
    The 500mm mirror lens is rather compact. The lever of the long lens and the weight / center of gravity being further away from the ball head will make it even worse when the camera is mounted on the tripod head. If you use a tripod collar for the lens then the entire setup is a) better balanced; and b) movements at the camera side will cause less jitter because the pivotal point is somewhere in the middle of the setup.
    EOS

  5. #5

    Default Re: Canon 70-200 mkII + 2x extender question

    Quote Originally Posted by Octarine View Post
    What do you mean by 'jitter'? The image shaking in viewfinder? Well, that's pretty normal since the narrow field of view amplifies the slightest movement of the camera / lens system. AFAIR, the 500m mirror lenses are manual focus lenses, it's pretty normal that the image 'jitters' while you focus and touch the lens.
    But then: is your tripod / tripod head stable enough?
    If you want to use this physically longer lens of 70-200 with extender then do consider a tripod collar balance the camera / lens setup.
    Quote Originally Posted by Octarine View Post
    The 500mm mirror lens is rather compact. The lever of the long lens and the weight / center of gravity being further away from the ball head will make it even worse when the camera is mounted on the tripod head. If you use a tripod collar for the lens then the entire setup is a) better balanced; and b) movements at the camera side will cause less jitter because the pivotal point is somewhere in the middle of the setup.
    Thanks. Will get a extender to try out then.

  6. #6

    Default Re: Canon 70-200 mkII + 2x extender question

    the more tele the lens,the more easier to get jitter.
    i have the lens and the 2x MK III extender and at 400mm,the stability of the tripod head and tripod is very important.
    but iam more concern with the IQ on this set up.
    iam curious what do u shoot with these lenses?
    Last edited by Turbonetics; 13th June 2014 at 05:28 PM.

  7. #7

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    What camera are you using? You might want to just get a wired remote
    hi

  8. #8

    Default Re: Canon 70-200 mkII + 2x extender question

    Quote Originally Posted by Turbonetics View Post
    the more tele the lens,the more easier to get jitter.
    i have the lens and the 2x MK III extender and at 400mm,the stability of the tripod head and tripod is very important.
    but iam more concern with the IQ on this set up.
    iam curious what do u shoot with these lenses?
    For now, just moon shots. Not proficient enough to try moving targets.

    Quote Originally Posted by silvermoon1407 View Post
    What camera are you using? You might want to just get a wired remote
    5D mk2. I do use a wired remote for shooting, but the 500mm is manual, hence still need to move the lens when focusing.

  9. #9

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    Quote Originally Posted by cokezerodrinker View Post

    For now, just moon shots. Not proficient enough to try moving targets.

    5D mk2. I do use a wired remote for shooting, but the 500mm is manual, hence still need to move the lens when focusing.
    The moon moves significantly at 500mm. By the time u focus, u need to recompose already, which may explain the jitters. Not to mention u probably need at least 1/500s for sharp shots
    hi

  10. #10

    Default Re: Canon 70-200 mkII + 2x extender question

    Thanks for the tip!

    The movement was visible, but still managable, given that the focus didn't really change much. By moving targets, I meant anything moving faster than a slug probably.
    Last edited by cokezerodrinker; 16th June 2014 at 04:39 PM.

  11. #11

    Default Re: Canon 70-200 mkII + 2x extender question

    Quote Originally Posted by cokezerodrinker View Post
    For now, just moon shots. Not proficient enough to try moving targets.



    5D mk2. I do use a wired remote for shooting, but the 500mm is manual, hence still need to move the lens when focusing.
    I haven't use a mirror lens before,but when shooting moon i prefer to use manual focus.
    and yes the moon moves so its best that u give allowance to the position it is moving towards so u do not need to keep adjusting your lens position. be it using a 70-200mm with 2x TC or a 500mm mirror lens,stability is very important in shooting moon.
    some things u can take note other than positioning the lens mentioned above and a stable support,it is best that u use a remote shutter and mirror lock up if your camera has this features.

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