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Thread: Lens recalibration

  1. #1

    Join Date
    Nov 2010
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    12

    Lens recalibration

    Hi
    My Nikkor-m 300mm F9 seems little too soft compared to 75mm grandagon-n and 210mm apo-sironar-n. Is there any place that can re-calibrate the lens?
    OR just my expectation is too high.


    Thanks

  2. #2

    Join Date
    Feb 2015
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    Re: Lens recalibration

    You could start by defining "re-calibrate".

  3. #3

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    Jul 2006
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    Collinsville, CT USA
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    Re: Lens recalibration

    Are we talking about the distance between the front and rear groups of elements? Over the years I've come across a few (3) optics mounted in shutters that projected mediocre images. In those three cases the distance was more than it should have been and I'm talking in a couple of mm's.

  4. #4
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Lens recalibration

    Quote Originally Posted by Greg View Post
    In those three cases the distance was more than it should have been and I'm talking in a couple of mm's.
    That's a huge error.
    2mm = 0.080".

    Precision machine work can easily hold a tolerance of +/- 0.001" (0.0254mm).
    Tight tolerance work can do 1/10th of that error.

    - Leigh
    Last edited by Leigh; 7-Dec-2017 at 11:23.
    If you believe you can, or you believe you can't... you're right.

  5. #5

    Re: Lens recalibration

    25.4mm per inch..

    2mm / 25.4 = 0.07874 inch.



    Bernice

  6. #6

    Join Date
    Sep 1998
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    Oregon and Austria
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    Re: Lens recalibration

    Quote Originally Posted by justiny View Post
    Hi
    My Nikkor-m 300mm F9 seems little too soft ...
    I had a similar problem with my Nikkor M 300mm when I first got it. After a bit of examination I determined that the lensboard I had it mounted on was preventing the rear element from seating all the way into the shutter barrel. A bit of woodworking fixed the problem and the lens performed spectacularly thereafter. Maybe you have a similar issue?

    Best,

    Doremus

  7. #7

    Join Date
    Jan 2013
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    Madisonville, LA
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    Re: Lens recalibration

    You can send the lens to a shop like SKG and have them check the alignment. I've done that with the number of my lenses

  8. #8
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Lens recalibration

    Quote Originally Posted by Bernice Loui View Post
    25.4mm per inch..
    2mm / 25.4 = 0.07874 inch.
    Hi, Bernice,

    Brain fade.

    1mm = 0.040" 2mm = 0.080".
    That's the rough equivalent used by machinists for visualizing dimensions.

    Note to self: Do not post before coffee.

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

  9. #9

    Join Date
    Jan 2006
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    Tucson AZ
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    1,300

    Re: Lens recalibration

    The machined leader block on LTO tape drives was held to around 5 micron tolerances. At one point it was costing $13 for a piece of Delrin about half the size of your thumbnail. Finally after only 5 - 10 years of trying we were able to hold tolerance in a molded version.

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