Question about Detent rings?

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  1. Question about Detent rings?

    #1

    I have looked through the guide book and frequently asked questions and can not seem to get the info I am looking for. How do you determine what lens goes with what Detent ring? Is it the N=18 so my lens choice would be a 18mm? Seems like this makes sense with the number of dents per plate. Hope this is the right place to ask.

    Cheers,
    Graham Twomey
  2. Re: Question about Detent rings?

    #2
    Users Country Flag
    Join Date: Apr 2008
    Location: Saddleworth UK
    Posts: 242

    Quote Originally Posted by Grahamtwomey View Post
    I have looked through the guide book and frequently asked questions and can not seem to get the info I am looking for. How do you determine what lens goes with what Detent ring? Is it the N=18 so my lens choice would be a 18mm? Seems like this makes sense with the number of dents per plate. Hope this is the right place to ask.

    Cheers,
    Graham Twomey

    some body may come up with a table of focal lengths etc.
    However if you devide the number into 360 Degrees it give the angle between a pair of holes .
    18 holes = 360/18=20 degrees however you must still allow for over lap.
    Various calculators can be found here.. http://www.tawbaware.com/maxlyons/calc.htm
    And perhaps more useful here.. http://www.frankvanderpol.nl/fov_pan_calc.htm
  3. Re: Question about Detent rings?

    #3
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    Join Date: Apr 2008
    Location: Hong Kong
    Posts: 2,366



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