NN3 MkII & 7d - My lower rail settings are odd
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Thread: NN3 MkII & 7d - My lower rail settings are odd


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  1. NN3 MkII & 7d - My lower rail settings are odd


    After multiple calibration sessions with my 7d and the NN3 MKII I consistently come up with 57-58mm for the lower rail setting. Everyone else here and on other boards say that 53mm should be right, but if I try that the center of rotation on the rotator target is WAY off. Could I possibly have something assembled incorrectly or maybe doing something else wrong?

  2. #2
    Users Country Flag
    Join Date: Aug 2008
    Location: Netherlands
    Posts: 1,741

    Hi Mitch,

    What camera are you using? Does the long side of the vertical rail's foot show to rotator? Are you using canon 5D II?

  3. #3

    As I said in my op it's a canon 7d. Yes, the "deeper" foot of vertical rail is facing inward towards rotator head.

  4. #4
    Users Country Flag
    Join Date: Aug 2008
    Location: Netherlands
    Posts: 1,741

    Ups, sorry, missed that early in the morning.

    http://wiki.panotools.org/Entrance_Pupil_Database H for 7D is 42 mm in case the colleagues measured right. Just check it on your own again. My NN3 adds 13mm offset to CP-2. This means LRS should be 55mm.

    Have a look to this thread: http://www.nodalninja.com/forum/show...r+rail+setting

    They way I do it with smooth's tutorial: http://www.easypano.com/forum/displa...PagePosition=1

    Last edited by hindenhaag; 10-08-2012 at 10:25 AM.
  5. #5

    Thanks for the reply. I have double checked all the tutorials as well as my settings and keep coming up with 58mm for the lower rail. I've uploaded some images that show my rig as well as the live view (with grid) in various degrees of rotation about the head. Keep in mind the upper rail has not been set here, only the lower (upper is at an arbitrary position in these photos)...


    I've also uploaded a video showing the camera rotating around...


    I guess as long as it works correctly there really isn't a problem, but its just a bit confusing that everyone else gets a lower rail position that is SO much different with the same setup. Is there any chance that the camera plate that came with my NN3 MKII kit is slightly different?
  6. #6

    Mitch, Far more useful would be two actual camera shots of the nadir taken with the camera pointing vertically down, incrementing the yaw setting of the head by 180 degrees between them. But it doesn't much matter what settings anybody else is using. It's good that you have taken the trouble to set up your head carefully yourself, and the proof of the pudding is in the eating. If your settings work well for you then be happy and shoot some panoramas. I have only ever used my own settings and I really don't care what settings anybody else comes up with.

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