topic EF 85mm f1.2L How to replace rear cover in EF & RF Lenses

EF 85mm f1.2L How to replace rear cover

ebiggs1 — Fri, 01 Nov 2024 15:43:49 GMT

As a general rule, I advise most folks to not try camera/lens repair themselves. However, if you are in the business you have occasion to make quickie repairs to keep the wheel rolling along so I have done some in my career.

Anyway one that most could or can do is replace to rear cover on your EF 85mm f1.2L. They seem to have a problem with getting a sticky coating that makes them almost unusable. You can still get the rear cover part but supply is getting less and less so if you need one get it sooner rather than later. The Rebel T4 has a similar problem don't know if it related. Anyway beside the new part all you need is the proper Philips style screwdriver. It is tiny and a larger one will not work you will simply damage the screws.. Tweezers can be helpful as these screws are tiny. They are tightly affirmed in the lens so careful pressure is required. There are six screws.

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Re: EF 85mm f1.2L

ebiggs1 — Fri, 01 Nov 2024 15:22:22 GMT

BTW, if interested the part is Main Cover Housing Ass'y CY3-2154-010

Re: EF 85mm f1.2L

Peter — Fri, 01 Nov 2024 15:32:56 GMT

Did you try to clean it off with isopropyl alcohol?

Re: EF 85mm f1.2L How to replace rear cover

ebiggs1 — Sat, 02 Nov 2024 19:43:50 GMT

Yes doesn't work. Won't even touch it.

Re: EF 85mm f1.2L How to replace rear cover

boc1972 — Fri, 15 Aug 2025 11:57:39 GMT

Hello. I want to ask what is the part name for the rear cover for Canon 85mm 1.2 L mark 1. I want to change it on my own lens but I don't know the Assembly number and if you can suggest where I can purchase it. Thank you.

Re: EF 85mm f1.2L How to replace rear cover

ebiggs1 — Fri, 15 Aug 2025 14:05:44 GMT

EF 85 F1.2 II Main Cover Barrel ASS'Y Rear Tube CY3-2154. It is about $50 bucks.