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Thread: Nikkor 90 F8 iris Diaphragm questions

  1. #11
    Jim Jones's Avatar
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    Re: Nikkor 90 F8 iris Diaphragm questions

    Serge -- The lens cell should be installed when using the technique I described in post 7 or you ,ay get a significantly wrong reading.

  2. #12

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    Re: Nikkor 90 F8 iris Diaphragm questions

    Click image for larger version. 

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ID:	189391Hi Jim,

    Looks like you solved the question.
    With the elements attached, the iris is open.
    As Neil said you can barely discern the iris.

    Thanks everyone for your help.

    Serge

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    Quote Originally Posted by JimL View Post
    Looks about right to me... but it would be good if you took a similar picture with the front element installed and the lever set to f8. Neil and Jim's posts both describe how the aperture should behave when looking through the front lens element. For that lens at f8, the aperture should not be open to the full opening of the shutter (which is 24mm). Unless the lever is installed upside down (which it's not), the only other thing that could be wrong that I can think of is if the adjustment ring was not engaged properly with the internal pins of the mechanism. But then your aperture wouldn't open and close properly.

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