PDA

View Full Version : Collapsible Cron Repair

trittium
07-03-2007, 17:07
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?
trittium
07-03-2007, 18:14
does anybody know?
trittium
07-04-2007, 15:04
Here is a photo to help explain my issues

http://farm2.static.flickr.com/1264/717966062_89829c05d1_o.jpg
350D_user
07-04-2007, 15:08
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
07-04-2007, 16:01
Have you tried using a rubber ring for traction/friction to unscrew the front retaining ring?
trittium
07-04-2007, 17:31
Have you tried using a rubber ring for traction/friction to unscrew the front retaining ring?


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?
trittium
07-04-2007, 17:32
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.

I tried from the rear, but I cannot get the retaining ring to unscrew fully.
wlewisiii
07-04-2007, 18:06
DAG. Cost me about $100 to fix from a similar level of dissassembly.

William
trittium
07-04-2007, 18:13
DAG. Cost me about $100 to fix from a similar level of dissassembly.

William

$100 is more than I want to pay, but at this point it is the principle.
trittium
07-04-2007, 19:38
I was able to manipulate the aperture diaphram through the screw holes with a pin. So it is fixed. Yey! Thanks for the support.