Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,733   Posts: 1,515,348   Online: 978
      
Results 1 to 5 of 5
  1. #1
    Falkenberg's Avatar
    Join Date
    Sep 2007
    Location
    Denmark
    Shooter
    8x10 Format
    Posts
    469
    Blog Entries
    11
    Images
    7

    Movements on a 20x24" - how precise ?

    I was playing aroung with a Manfrotto 405 geared head as an inspiration on how movements can be handled, but it made me wonder how precise movement has to be on a 20x24" camera ? The Manfrotto head offers two kinds of adjustments, quick and very fine. I have looked a several differnt smaller cameras and they seem to be very different i how precise the movements are. I have no experience with a format as large as a 20x24".
    Last edited by Falkenberg; 01-05-2008 at 04:19 AM. Click to view previous post history.

  2. #2

    Join Date
    Apr 2004
    Location
    Montgomery, Il/USA
    Shooter
    Multi Format
    Posts
    4,971
    Well, if you want to get really fine, design yourself something with a worm gear setup. I think it would really be overkill for something as crude as a view camera. If you do worm drive make sure you have something in mind to disengage the worm so you're not spending too much time trying to zero the camera.
    Think in terms of a trapped threaded shaft engaged with a fixed nut.
    I think I've seen something like this on a focusing stage for macro work.
    Heavily sedated for your protection.

  3. #3

    Join Date
    Dec 2004
    Shooter
    Large Format
    Posts
    540
    Falkenberg,

    If you can get up close and personal with a Calumet C-1 8x10 you will see the focus adjuster is both fast and very fine. It has a round wheels running in tracks, no teeth. Works very well, ultra-fine adjustment and easy the clean.

    Have fun with it.

  4. #4
    Falkenberg's Avatar
    Join Date
    Sep 2007
    Location
    Denmark
    Shooter
    8x10 Format
    Posts
    469
    Blog Entries
    11
    Images
    7
    I will try to find a Calumet C-1 camera or some pictures of it. I had the chance to work some more with the Manfrotto head and I realize that I had misunderstood the way it works. It has two knobs on each and one of the is the finetuning and the other releases for free rotation. I found the Patent litterature for it and it describes it very nicely (http://www.google.com/patents?id=h6o...BAJ&dq=5589903). I also had the chance to play with a hydraulic adjusted clamping device. It could also be a fun way to do the adjustments. But it will never be a fast way to adjust, but it will offer extremely good fixing.

  5. #5

    Join Date
    Jan 2006
    Shooter
    Multi Format
    Posts
    905
    It really depends, how accurate do you want? My cameras have leadscrews for focusing, the next 20x24 I build will have them for movements as well, though I imagine it will add some weight to the camera. For a first attempt, I'd use the philips/chaminox approach, leadscrew driven focus, manual movements.


    erie



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin