November 22, 2017, 05:23:40 PM

Author Topic: 85L mk II rubber coating breakdown  (Read 17057 times)

YuengLinger

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Re: 85L mk II rubber coating breakdown SAME HERE!
« Reply #30 on: September 25, 2016, 08:20:31 AM »
Why is this happening? Any ideas on this?

DEET did it!!!  Sorry for late reply.

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Re: 85L mk II rubber coating breakdown SAME HERE!
« Reply #30 on: September 25, 2016, 08:20:31 AM »

TommyLee

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Re: 85L mk II rubber coating breakdown
« Reply #31 on: September 25, 2016, 10:06:38 AM »
ikeithb
/////
best guess....
oils and contaminants transferred from hands..

as you pass thru industrialized society each day...
you touch all sorts of stuff...
and collect chemicals, contaminants....
one or more maybe act as solvent in a way to breakdown the rubber...
Camera bodies seem to do better than this older lens

this lens design is pretty old... looks the same as mark 1 to me
.... so that may be 15+ yr old tech  in that rubbery feeling grip....

two things good here
1. after J.R. gave me a lead... I gained confidence in trying something myself
2. the design was good to let the old part slide off so easily..replacement was almost no effort

one worrying thing...what other lenses or bodies will have this happen?

TOM

YuengLinger

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Re: 85L mk II rubber coating breakdown
« Reply #32 on: September 25, 2016, 12:49:25 PM »
OP, Tom, do you use insect repellent?

It will definitely break down rubberized coatings.  Well documented.

RBC5

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Re: 85L mk II rubber coating breakdown
« Reply #33 on: September 25, 2016, 01:37:17 PM »
Not just insect repellent, as there are several kinds, but DEET itself. It is a solvent that dissolves plastics, synthetic clothing, even varnish. If you rub enough of it on your hands you can pick up your camera and leave permanent fingerprints in the plastic. Nasty stuff.

Mt Spokane Photography

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Re: 85L mk II rubber coating breakdown
« Reply #34 on: September 25, 2016, 02:54:58 PM »


two things good here
1. after J.R. gave me a lead... I gained confidence in trying something myself
2. the design was good to let the old part slide off so easily..replacement was almost no effort

one worrying thing...what other lenses or bodies will have this happen?

TOM

Occasionally, someone has a problem with rubber or coatings on cameras and lenses.  Its common enough such that replacement rubber parts for lenses and cameras are sold on ebay.  You can get them from Canon, of course.  I've had literally dozens of Canon lenses and bodies, and have removed those rubber parts to service some of them, but never yet had to replace one, but it does happen.

Rob-downunder

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Re: 85L mk II rubber coating breakdown
« Reply #35 on: September 25, 2016, 04:24:29 PM »
Hi,

This is not an uncommon issue with the 85 1.2. What you need to do is buy spare part CY3-2154-000, which you can find on eBay US for 50 bucks. There are 6 small screws to undo, slip the old cover off and replace with the new. These screws are only for the plastic cover and do not affect the lens alignment in any way.

In all the cases I've seen online the affected rubber is restricted to this cover, although sometimes there may be a little of the gummy rubber that has been transferred to other parts of the housing, this should be minor and easily cleaned after replacing the faulty cover.

Rob

TommyLee

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Re: 85L mk II rubber coating breakdown
« Reply #36 on: September 29, 2016, 03:25:34 PM »
YuengLinger


never use insect repellents..
or paints...
or cleaning solvents ...(much)....
I would hazard a guess.... hand cream....    chapstick-like products....stuff like that ... that works its way into our lives...
....

and the part is available from canon...check this thread closely....
for $27 + shipping.....
no need for e-bay








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Re: 85L mk II rubber coating breakdown
« Reply #36 on: September 29, 2016, 03:25:34 PM »

BigAntTVProductions

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Re: 85L mk II rubber coating breakdown
« Reply #37 on: September 29, 2016, 04:57:56 PM »
looks like its was melting from extreme heat/fire
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Billybob

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Re: 85L mk II rubber coating breakdown
« Reply #38 on: October 22, 2017, 08:26:06 PM »
An amazing topic!

I finally decided to get rid of my 85mm L II.  However, when I pulled it out of storage, it had the sticky feel described in the thread.

Glad to find there is an easy--and inexpensive--fix.

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Re: 85L mk II rubber coating breakdown
« Reply #38 on: October 22, 2017, 08:26:06 PM »