Collapsible Cron Repair

T

trittium

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Oct 3, 2005
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I uncrewed to two screws holding in the aperture ring on the cron. I guess the spring on the blade pushed the retaining ring up, and now I can't get the screws back in.

I was able to remove the first and second element, but there is another one in the way I cannot figure out how to remove. It doesn't have spanner marks and does not fall out. I have tried to unscrew the filter ring, to no avail. How do I get to the aperture retaining ring so I can push it down and screw the screws back in?
 
Here is a photo to help explain my issues

717966062_89829c05d1_o.jpg
 
An analysts viewpoint... if you can't get at it from one side...

... unless attacking the lens from the rear element isn't a good idea.
I stand to be corrected on this one, having never had the guts to strip a lens at all.
 
Flyfisher Tom said:
Have you tried using a rubber ring for traction/friction to unscrew the front retaining ring?
Click to expand...


I tried a rubber ring, and rubber lid openner. From what I read, the whole front assembly is supposed to unscrew, but it isn't unscrewing. Could it be cemented in place? If so, how can I safely break/lossen the cement without damaging the other elements?
 
350D_user said:
An analysts viewpoint... if you can't get at it from one side...

... unless attacking the lens from the rear element isn't a good idea.
I stand to be corrected on this one, having never had the guts to strip a lens at all.
Click to expand...

I tried from the rear, but I cannot get the retaining ring to unscrew fully.
 
DAG. Cost me about $100 to fix from a similar level of dissassembly.

William
 
I was able to manipulate the aperture diaphram through the screw holes with a pin. So it is fixed. Yey! Thanks for the support.
 
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