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Esteemed Contributor
Posts: 4,987
Registered: ‎06-25-2014

Re: Problem with two different Canon 85mm f/1.8 Lenses


@CaliforniaDream wrote:

@RobertTheFat wrote:

@ebiggs1 wrote:

"I wound up buying a second 85mm brand new."

 

Call Canon 1 (800) 652-2666.  If it is brand new and it is from a real Canon USA dealer, Canon will get it right. If you are buying grey .......... well you'er on your own.

 

BTW, it is unlikely the contacts (other lenses work OK) but if you must clean them use a q-tip and denatured alcohol. Nothing else!


Someone with more knowledge of chemistry than I have may want to weigh in on this, but I'd be inclined to prefer isopropyl alcohol over denatured alcohol, precisely because it's already poisonous and therefore doesn't need to be "denatured" (in order to prevent it from turning up in untaxed liquor). The whole point of using alcohol to clean contacts is that in its pure form it doesn't leave a residue. By definition, denatured alcohol contains an adulterant; and depending on what that adulterant is, it might conceivably leave a residue.


Denatured alcohol is "denatured" usually by adding methanol to ethyl alcohol making it poisonous but having minor alteration on its prosperities.


Sounds sensible. Thanks for the clarification.

Bob
Philadelphia, Pennsylvania USA
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Posts: 11,230
Registered: ‎12-07-2012

Re: Problem with two different Canon 85mm f/1.8 Lenses

Denatured alcohol has always been the goto solvent for removing grime from hard surfaces, appliances, machinery, finished products and lens contacts.  It is my preferred agent although I am sure others will work. 

 

However, I still maintain cleaning the lens contacts is a rarely needed exercise. But if you must, denatured alcohol is a highly effective solvent and cleaning agent.

EOS 1DX and 1D Mk IV, even less and less other stuff.
New Contributor
Posts: 4
Registered: ‎03-09-2019

Re: Problem with two different Canon 85mm f/1.8 Lenses

The response from Canon Service is that there is "no Service Advisory for this lens". I'm out of luck to get it repaired for no cost_ I figured that would be a long shot. When I get it back, I will use it to make sure all functions are satisfactory. I like this lens for shooting indoor sports in poorly lit gyms, particularly volleyball. The picture quality is on par with my 70-200 f/2.8 II for this purpose, and it's 2/3 stop faster, and more hand holdable. I heavily crop final pictures and have been pleased with results. Let the testing begin.

New Contributor
Posts: 4
Registered: ‎03-09-2019

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

Service and repair has been completed, and I have received the repaired lens.

 

The Service Details: "...it was found that the power diaphragm assembly was broken causing an error to be displayed from time to time. The power diaphragm was replaced. The product functions were confirmed."

 

I have no knowledge how or why this part broke, and it is not a lens that I heavily use, but I have done some test shots, and it appears that it actually locks on focus faster than what I remember before the repair, so that's all good. Canon Service turnaround time was very good, as it took only 5 days from the time it was sent in until is was returned back to me. That is based on me living in Norcal and the repairs done in Socal. Hopefully, this issue is closed for me.

 

New Contributor
Posts: 3
Registered: ‎03-09-2019

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

[ Edited ]

My issue with this, is that it is happening just on the 85mm f/1.8 lens. I have other lenses that don't do this. I got a similar response from Canon, but am taking additional steps. If they stand behind their gear, then this problem should not happen just on a specific lens.

 

Thanks for the info everyone.

Occasional Contributor
Posts: 7
Registered: ‎09-24-2018

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

I am considering the purchase of an EF 85mm f/1.8 USm because they are on sale. Is the broken power diaphragm (whatever that is) a common problem with this lens model? I've been reading countless customer reviews and this is the first time I've heard of this defect. Cautious buyer!

Plankowner110
6D, EF 35mm f2 IS USM, EF 85mm f1.8 USM
VIP
Posts: 8,202
Registered: ‎08-13-2015

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm


@Plankowner110 wrote:

I am considering the purchase of an EF 85mm f/1.8 USm because they are on sale. Is the broken power diaphragm (whatever that is) a common problem with this lens model? I've been reading countless customer reviews and this is the first time I've heard of this defect. Cautious buyer!


I could not say one way or the other.  But, I will say that I am not a fan of this lens.  The lens hood is a complete joke.  It does not even lock into place.  I had initially thought that I was sent a third party hood by mistake.

----------------------------------------------------------------------------------------------------------------------------------------------------------

"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 11,230
Registered: ‎12-07-2012

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

" Is the broken power diaphragm ... a common problem with this lens model?"

 

Even if it is, it isn't a very expensive part. $50 bucks or so, I guess, maybe less. It is a pretty old design so it has been well tested in the field so I would not worry about it.

The thing you should be asking is, what are you going to do with an 85mil?  It is a very limited use and specialized lens.  It really does just one job well.  Portraits. If you are not into portraits I would not buy an 85mm lens.

It is not a "my first lens" or even "my second lens" choice.  So what other lenses do you have?

EOS 1DX and 1D Mk IV, even less and less other stuff.
VIP
Posts: 11,230
Registered: ‎12-07-2012

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

A little further advice when considering the Canon EF 85mm f/1.8 USM Lens.  Do you already own the Canon EF 70-200mm f/2.8L IS III or II USM Lens?  If not this is the lens you want.  Save the albeit small amount of money put towards the 85mil to help fund or to save for the Canon EF 70-200mm f/2.8L IS III USM Lens.

In most of the professional world of portrait photography the Canon EF 70-200mm f/2.8L IS III USM Lens has superseded the 85mm as the lens of choice.  After all it includes the desirable 85mm FL.  Myself included even though I own the absolutely beautiful EF 85mm f1.2L. Occasionally I use my 85mm f1.2 but it is for the f1.2 not the 85mm.

 

Don't buy any lens just because it is cheap or on sale.  These are poor reasons to do so.

EOS 1DX and 1D Mk IV, even less and less other stuff.
Occasional Contributor
Posts: 7
Registered: ‎09-24-2018

Re: Problem with two different Canon 85mm f/1.8 Lenses... Power Diaphragm

Thank you. I will pass on the 85mm lens.
Plankowner110
D6, 35mm f2 IS USM, 50mm f1,8 STM
Plankowner110
6D, EF 35mm f2 IS USM, EF 85mm f1.8 USM
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