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Zen Coating Repair Removal - Sigma

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Oltamin View Drop Down
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Joined: 20 September 2014
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Post Options Post Options   Quote Oltamin Quote  Post ReplyReply Direct Link To This Post Topic: Zen Coating Repair Removal - Sigma
    Posted: 18 June 2020 at 16:05
Have tried isopropyl on the Zen finish without much success. I noticed in a recent lens review here on Dyxum (Sigma 28 1.8 posted 17/06/2020), DiMa has successfully cleaned a Sigma 28 1.8. Perhaps he (or others) could shed light on this. He notes that he "completely / professionally removed the zen coating, underneath is a shiny black metal body". I didn't manage to reveal the polished black surface. Perhaps there is a soaking or percentage formula of isopropyl, or alternative solution(s) involved in the process?
 



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Basil View Drop Down
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Post Options Post Options   Quote Basil Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2020 at 17:14
I had that issue on my 500/4.5 It was a big sticky beast when I bought it. I used clean white cotton shop rags and 91% isopropyl alcohol. (old white t-shirts will work as well). I put an ounce of alcohol and the rag and rubbed a small area until the coating was removed. Then I turned the rag and repeated the process until the entire lens was cleaned.

1) Make sure the alcohol is strong enough. Some solutions are only 70%. That didn't work well at all.

2) Wear gloves when you do this. It is a messy process

3) You will remove any lettering on the lens. It's a fair trade-off in my opinion.

4) Take your time. It took me a half hour to clean the beast. Plan accordingly.

Have Fun!!!! It's actually enjoyable to see it come clean and know that you are extending the life of an old lens.

Edited by Basil - 18 June 2020 at 21:29
To see is to enjoy. To see beyond is to rejoice.

A77Mark II; A850; A700; A100; NEX 6; various film bodies and an ever-changing collection of lenses
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Oltamin View Drop Down
Groupie
Groupie

Joined: 20 September 2014
Country: England
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Posts: 63
Post Options Post Options   Quote Oltamin Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2020 at 19:27
Thanks for the tip Basil. Likewise my early 300 2.8 has a lot of sticky area. I will try a stronger isopropyl solution on it. Fortunately the tripod collar, bearing the Apo and detail lettering looks as new after all these years. The only casualty will likely be some minor AF white lettering. It has a very large built in hood, which is sometimes sticking in the heat, so I'm at the point of no return! This in turn screw bolts on to an all metal outer hood which is usable.
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