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Thread: Iris for large lens?

  1. #1

    Join Date
    Sep 2007
    Location
    Boulder, CO
    Posts
    217

    Iris for large lens?

    Hi,
    I have a rather large lens that I am trying to decide what the best approach for an iris and/or shutter would be. The two elements need to be 1.365 inches apart, and the inside lens elements are about 2.5 inches across. I am going to machine a barrel/spacer but am wondering what to do about the iris.

    Another member with this lens machined a vertical waterhouse slot and would drop a slide with a hole in it (in front of the waterhouse stop) to get about 1/25th depending on the hole. I may end up doing this, but I would rather incorporate an adjustable iris and maybe throw a packard shutter in behind it.

    Others apparently have used Sinar Auto or Copal DS shutters, but that is a pretty expensive option considering most of the exposures will be long. I have also heard of people using "Rapidyne" shutters but am not familiar with them.

    Does anyone have or know where I can find a rather large iris that might work?


    Evan

  2. #2

    Join Date
    Dec 2007
    Location
    Washington, D.C.
    Posts
    1,497

    Re: Iris for large lens?

    Rolyn Optics sells a wide range of iris diaphragms suitable for lenses.

  3. #3

    Join Date
    Sep 2007
    Location
    Boulder, CO
    Posts
    217

    Re: Iris for large lens?

    Barry;
    Perfect! Thank you!

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