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New Contributor
Posts: 2
Registered: ‎05-10-2018

Power Diaphragm Unit EF100/2.8

Hi guys,

 

After having issues with the aperture of the above lens I did some research to find out that this is a well known problem and I have changed the Power Diaphragm at the Canon shop.

 

Now I'm wondering if this is a problem that is bound to happen again? Or is this resolved now that the power diaphragm has been changed.

 

So is this a problem with the initially installed power diaphragm or is there also a change it happens with this new one?

 

Thanks for your reply.

 

Best regards

 

Vincent

Honored Contributor
Posts: 5,094
Registered: ‎06-25-2014

Re: Power Diaphragm Unit EF100/2.8

I read this forum pretty consistently, and it's the first time I've seen that issue raised. When there's a prevalent problem, like the circuit board failure on the 70D, we usually hear about it. I think I'd chalk it up to bad luck and not worry about it too much.

Bob
Philadelphia, Pennsylvania USA
VIP
Posts: 11,695
Registered: ‎12-07-2012

Re: Power Diaphragm Unit EF100/2.8

Agree, don't "worry about it too much."

EOS 1DX and 1D Mk IV and several lenses!
New Contributor
Posts: 2
Registered: ‎05-10-2018

Re: Power Diaphragm Unit EF100/2.8

I found that on other places on the web indeed. Not here on Canon.

 

So I didn't make this up  Smiley Happy

 

I got it fixed but then I was wondering if this was a recurring problem or not.  As I have another lense that is exactly the same and I was afraid that one was going to get the same issue.

 

Thanks for your input guys. Much appreciated

 

Vincent

VIP
Posts: 11,695
Registered: ‎12-07-2012

Re: Power Diaphragm Unit EF100/2.8

I used one for a few years and it never acted up or failed.  So there you go, just use it and forget it.

EOS 1DX and 1D Mk IV and several lenses!
New Contributor
Posts: 4
Registered: ‎02-07-2018

Re: Power Diaphragm Unit EF100/2.8

I had this fail on my 24-105 IS. It cost me 350 to fix it. just rec'd it today...Good news it was fast turnaround (2 days to get there, NJ for maine) and a few days till they shipped and it arrived the next day...and cost less than a new lens...ad my had terrible lens creep and that was fixed...

 

but somewhat frustrating to have to spend that much..seems to be a well known issue.....I only use it as a hobby, not professionally, generally staying in my closet, well packed in a backpack....and never in incelement weather or treated rough....

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