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Thread: Damaged aperture - is it fixable

  1. #11

    Join Date
    Jul 2017
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    Re: Damaged aperture - is it fixable

    Quote Originally Posted by Randy View Post
    It only took 6 minutes to get the first entirely unhelpful condescending comment of this thread - thank you internets!
    Actually I thought it very helpful. It all results in a lens that is functional.
    How many minutes did it take to damage the lens?

  2. #12

    Join Date
    Jul 2013
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    Queensland, Australia
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    Re: Damaged aperture - is it fixable

    I had two pins come loose on my cooke series iia 15 inch, I didnt attempt a fix but sent it straight to sk grimes for repair.
    Wasnt hugely expensive albeit the postage.

  3. #13

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    Mar 2016
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    Seoul
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    156

    Re: Damaged aperture - is it fixable

    I tried to repair aperture blades on a shutter with a similar problem, I didn't find a way to get the metal stub to stick in the blade. I remember trying a dab of thread locker, that didn't work and I didn't have anything else that felt worth trying. That was a 20s or 30s dial set shutter. On the other hand, I did manage to replace a set of blades in another dial set shutter, the blades were intact but a couple had jumped out of place somehow (heavy impact at some point, possibly). It took me a good couple of hours to get the blades back in, the first 17 or 18 blades are simple enough, the 19th was a nuisance but getting the final blade in place was tough. A few times during that process I wondered if there's a secret knack to replacing the blades, I suppose the answer is lots of practice and small fingers.

    Before anyone points out I shouldn't have bothered; I received both lenses in that condition - and a professional repair would have cost more than a replacement lens. I hope Randy can fix that lens, I'll be interested to hear if there are any tips about getting the stub to stick in place in an aperture blade.
    Peter

  4. #14
    Randy's Avatar
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    Dec 2010
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    Virginia, USA
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    Re: Damaged aperture - is it fixable

    The blades are plastic, and about 6cm end to end. The pins are brass, and about 2mm in diameter and height.

    Click image for larger version. 

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    Click image for larger version. 

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    I may just try as has been suggested - leave the damaged blades out and try it with just 18.
    https://dl.dropboxusercontent.com/u/52893762/bigger4b.jpg

  5. #15
    Jac@stafford.net's Avatar
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    Dec 2012
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    Winona, Minnesota
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    5,410

    Re: Damaged aperture - is it fixable

    I have a lens with a totally whacked aperture - it has broken blades stuck in an oval shape. I thought it might have some interesting qualities - it does not. The lens is on the bench awaiting a postmortem.

  6. #16
    Tin Can's Avatar
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    Dec 2011
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    12,871

    Re: Damaged aperture - is it fixable

    Looks like it was originally peened.




    Quote Originally Posted by Randy View Post
    The blades are plastic, and about 6cm end to end. The pins are brass, and about 2mm in diameter and height.

    Click image for larger version. 

Name:	wollensak1.jpg 
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Size:	84.8 KB 
ID:	182002

    Click image for larger version. 

Name:	wollensak2.jpg 
Views:	23 
Size:	46.5 KB 
ID:	182003

    I may just try as has been suggested - leave the damaged blades out and try it with just 18.
    sin eater

  7. #17

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    May 2015
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    SooooCal/LA USA
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    Re: Damaged aperture - is it fixable

    If the pin is almost a snug fit, you can try superglue gel or thin, just keep it off the pivot pin moving surface, and it is beneath the surface of the iris blade...

    Note that if there is a blade issue, it is usually because there is a resistance or binding of the blades, inner rings, or the pivots that don't allow the blades to move freely... Check for migrated lubes, oxidation etc...

    If you try to fix, make sure the pin comes perfectly straight off of blade or blade will not sit correctly and repair point will be strained...

    Steve K

  8. #18

    Join Date
    May 2016
    Location
    Manchester , England
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    22

    Re: Damaged aperture - is it fixable

    I don't know about repairing your existing aperture , but would it be possible to replace it as a unit with one of these off ebay ?
    https://www.ebay.co.uk/itm/New-4-60M....c100005.m1851

  9. #19

    Join Date
    Apr 2009
    Location
    Seattle area, WA
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    910

    Re: Damaged aperture - is it fixable

    I'm ashamed to say that I've fixed a broken aperture that was missing pins by sculpting new "pins" out of JB Weld. It works better than you would expect. The lens has been working for a year or two now with no issues.

  10. #20
    Tracy Storer's Avatar
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    Nov 2001
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    Oakland CA
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    Re: Damaged aperture - is it fixable

    Wollensak made a lot of lenses, and I mean a lot. Maybe you can find another (damaged / broken / cheap) lens that uses the same size aperture blades.
    Tracy Storer
    Mammoth Camera Company tm
    www.mammothcamera.com

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