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Thread: Changing shutters?

  1. #61
    Steve Smith's Avatar
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    Re: Changing shutters?

    Quote Originally Posted by Steve Smith View Post
    I think I would cut and thread one side then mount the shutter part on a custom made threaded mount and machine the other side's depth relative to the first side.
    Actually, that's complete nonsense as the two threads are on different pieces of metal. But the point is still valid that parts on a piece can be machined relative to other parts using a previously machined feature as the holding point for subsequent machining.

    If both front and rear threads were in the same piece of metal, there would be no gap for the shutter and f stop blades!


    Steve.

  2. #62

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    Re: Changing shutters?

    Quote Originally Posted by Old-N-Feeble View Post
    Ed... Any chance you can do a comparison of the two lenses regarding *gasp* bokeh? Then swap the cells and duplicate the test? I'd really like to see the difference between the round vs. penta iris shape. Ill bet others are interested too. BTW, I'll be doing similar comparisons one of these days.
    I received my Apo-Symmar lens this morning, and whilst it is in a Copal #1 shutter the aperture has 7 blades as opposed to the 5 blades I was expecting. I now see little reason to swap the shutters but if you would still like me to do the 'Bokeh' test I will but it will not be until next week. I am sure that at least one of my Copal apertures has only 5 blades?

  3. #63
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Changing shutters?

    Quote Originally Posted by Ed Bray View Post
    I am sure that at least one of my Copal apertures has only 5 blades?
    The #1 and #3 Copals have always(?) had seven blades.

    Earlier Copal 0 shutters had five blades.

    Then Nikon got them to do a special seven-blade version for the Nikkor lenses.
    Those have a capital letter 'S' in a circle on the side of the shutter.

    Then apparently Copal made the seven-blade version standard for the 0 shutter.
    I don't know if the non-Nikkor shutters have the "circle-S" or not.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

  4. #64

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    Re: Changing shutters?

    Thanks for the info Leigh, much appreciated.

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