Upper rail mounting plate play

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  1. Upper rail mounting plate play

    #1

    Hi!

    How much lateral play do you have on you NN5 upper rail mounting plate?
    The plate seems to be a lot narrower than the rail guides.
    How much?

    My setup:
    NN5+RD8
    Nikon D90
    Sigma 10-20mm F3.5 @20mm F8


    First I tightened the mounting plate to my camera as tight as I could, so that should not distort the measurement.
    Took photos at the extremes and measured the distance in Photoshop.

    Comes out to 1.611406066 degrees which doesn't seem like much but that's 102 pixels! On a higher res camera it'll be even more pixels.

    Combined with the play of the standard NN5 mounting plate (I plan to order the CP2 but I have to order it from abroad as no NN products are available in my country) that's a lot of play which is hard, nay, almost impossible to calibrate while in the field.

    Gives me headaches while stitching.

    Could someone measure theirs? Maybe just my copy is bad?









  2. Re: Upper rail mounting plate play

    #2
    Users Country Flag
    Join Date: Aug 2008
    Location: Netherlands
    Posts: 1,740

    Hi,

    a tiny little play is necessary to move and mount the plate. Use a 2- or 3-way spirit leveler in the shoe of your camera and set it to level. There will be no problem to stitch. Before you fix the upper rail knob hard level the camera with the spirit leveler and then fix tight. I never had stitching problems even without using the leveler.

    Heinz
  3. Re: Upper rail mounting plate play

    #3
    Users Country Flag
    Join Date: Apr 2008
    Location: Hong Kong
    Posts: 2,385

    Quote Originally Posted by kosmarnik View Post
    Hi!

    How much lateral play do you have on you NN5 upper rail mounting plate?
    The plate seems to be a lot narrower than the rail guides.
    How much?

    My setup:
    NN5+RD8
    Nikon D90
    Sigma 10-20mm F3.5 @20mm F8


    First I tightened the mounting plate to my camera as tight as I could, so that should not distort the measurement.
    Took photos at the extremes and measured the distance in Photoshop.

    Comes out to 1.611406066 degrees which doesn't seem like much but that's 102 pixels! On a higher res camera it'll be even more pixels.

    Combined with the play of the standard NN5 mounting plate (I plan to order the CP2 but I have to order it from abroad as no NN products are available in my country) that's a lot of play which is hard, nay, almost impossible to calibrate while in the field.

    Gives me headaches while stitching.

    Could someone measure theirs? Maybe just my copy is bad?


    Do you mean the play between the camera mounting plate and the upper rail? The play should be within 0.13-0.25 deg. They are made by die casting. So they are unlikely to have bad variations.

    Nick



    Fanotec
    We listen. We try harder.
  4. Re: Upper rail mounting plate play

    #4

    Quote Originally Posted by nick fan View Post
    Do you mean the play between the camera mounting plate and the upper rail? The play should be within 0.13-0.25 deg. They are made by die casting. So they are unlikely to have bad variations.

    Nick
    Yeah, between the mounting plate and the rail. I'm pretty sure that camera was really tightly mounted on the plate and that I only measured the play between the mounting plate and the rail.

    I superimposed the photos:


    I measure a 102px lateral distance between the points, which, if I'm correct in my calculations, comes out to ~1.6 degrees.

    So you're saying that's too much of play here?

  5. Re: Upper rail mounting plate play

    #5
    Users Country Flag
    Join Date: Apr 2008
    Location: Hong Kong
    Posts: 2,385

    Quote Originally Posted by kosmarnik View Post
    Yeah, between the mounting plate and the rail. I'm pretty sure that camera was really tightly mounted on the plate and that I only measured the play between the mounting plate and the rail.

    I superimposed the photos:


    I measure a 102px lateral distance between the points, which, if I'm correct in my calculations, comes out to ~1.6 degrees.

    So you're saying that's too much of play here?

    I can't recognize this part. Can you show a "zoom out" photo and circle the problematic part?


    Nick



    Fanotec
    We listen. We try harder.
  6. Re: Upper rail mounting plate play

    #6

    Quote Originally Posted by nick fan View Post
    I can't recognize this part. Can you show a "zoom out" photo and circle the problematic part?
    Um, that's the view from the camera showing the effect of the play.
    A zoomed out view of NN5 + RD8:




    An illustration:



    To be sure I'm talking about the plate on rail movement, not camera.

    I can take more photos of the my setup tomorrow.

  7. Re: Upper rail mounting plate play

    #7
    Users Country Flag
    Join Date: Apr 2008
    Location: Hong Kong
    Posts: 2,385

    Quote Originally Posted by kosmarnik View Post
    Um, that's the view from the camera showing the effect of the play.
    A zoomed out view of NN5 + RD8:




    An illustration:



    To be sure I'm talking about the plate on rail movement, not camera.

    I can take more photos of the my setup tomorrow.

    Do you mean you are sliding along the upper rail? If your camera is not square to the camera mounting plate, you will exagerate the effect of "play" between the camera mounting plate and the rail. The play is due to gap or tolerance between the plate and rail. It can be easily quantized. The gap is 0.1-0.2mm.

    Nick



    Fanotec
    We listen. We try harder.
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