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Old 05-02-2021, 07:53 PM
Dermy (Dave)
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Mirror aluminising - what are our options in Australia

Good evening all,

New to the forum, and new to the ATM scene. I've found myself with a 12.5" f/5 and an 8" f/7. The 8" definitely needs recoating, and the 12.5" will need it in the next couple of years.

I've been pointed at Saintech, and will ask them about prices.

What are our options for vendors to re-aluminise mirrors?

Cheers!

Dermy
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  #2  
Old 06-02-2021, 06:14 AM
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mura_gadi (Steve)
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Hello,

I posted yesterday in ATM section about Saintech, the other option may be A.E.C in SA. they also offered mirror coating services at one stage. Saintech may still be operating, with or without Wayne as the owner operator, Wayne has the knowledge, that's why I contacted him prior to Covid about his services.


Steve
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Old 06-02-2021, 07:57 AM
m11 (Mel)
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Wayne recoated a 12inch mirror for me in August of last year.
The company is called Palmway Optical now

https://palmwayoptical.com/
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  #4  
Old 06-02-2021, 09:08 AM
fsphotography (Frank)
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Longman optics in Tasmania. Very competitive on price.


Frank.
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  #5  
Old 06-02-2021, 09:15 AM
Stefan Buda
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I can do the 8" for you if you can't find anyone suitable. I coat my own mirrors up to 10" and if someone approaches me I help if I can.
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  #6  
Old 26-05-2021, 11:41 AM
legswilly (Werner)
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Quote:
Originally Posted by Stefan Buda View Post
I can do the 8" for you if you can't find anyone suitable. I coat my own mirrors up to 10" and if someone approaches me I help if I can.

What do you coat your mirrors with? You put a protective coating on your mirrors and what is it?
I am looking into mirror coating using silver nitrate. Now I am looking for protective coating.
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Old 26-05-2021, 01:27 PM
Stefan Buda
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I evaporate aluminium followed by half wave thickness of silicon monoxide for protection. The silicon monoxide turns to silicon dioxide (quartz) after exposure to atmospheric oxygen. Reflectivity is 90% and does not deteriorate as in the case of unprotected aluminium.
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Old 26-05-2021, 07:47 PM
legswilly (Werner)
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Quote:
Originally Posted by Stefan Buda View Post
I evaporate aluminium followed by half wave thickness of silicon monoxide for protection. The silicon monoxide turns to silicon dioxide (quartz) after exposure to atmospheric oxygen. Reflectivity is 90% and does not deteriorate as in the case of unprotected aluminium.

Can't do that myself. Can only do silver coating. There is coating I can apply myself from Angel gilding in the US called Angel Guard. I might not be able to import it, so I am looking here. I wear glasses and I get the lenses coated so they don't scratch (as much). There might be something that I can apply to the silver coating.


Your coating is done under vacuum. Did you build it yourself?
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  #9  
Old 27-05-2021, 10:48 AM
Stefan Buda
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Originally Posted by legswilly View Post
There might be something that I can apply to the silver coating.


Your coating is done under vacuum. Did you build it yourself?
Silver can be protected the same way as aluminium, but the silver should be evaporated rather than chemically applied. Aluminium has higher reflectivity at the blue end of the spectrum.

I built my own high vacuum system.
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  #10  
Old 06-06-2021, 08:33 PM
davidcampbell
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Quote:
Originally Posted by Stefan Buda View Post
I evaporate aluminium followed by half wave thickness of silicon monoxide for protection. The silicon monoxide turns to silicon dioxide (quartz) after exposure to atmospheric oxygen. Reflectivity is 90% and does not deteriorate as in the case of unprotected aluminium.
Stefan,

I have a tiny flat front surface mirror on a bath interferometer I made that needs recoating.
Would you be able to recoat it next time you are doing a bigger mirror?
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  #11  
Old 06-06-2021, 09:57 PM
Stefan Buda
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Originally Posted by davidcampbell View Post
Stefan,

I have a tiny flat front surface mirror on a bath interferometer I made that needs recoating.
Would you be able to recoat it next time you are doing a bigger mirror?
That should be no problem, but why don't you just rip apart an old DVD drive, as most of them contain at least one small front surface mirror. It doesn't need to be more than 4mm wide.
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  #12  
Old 07-06-2021, 07:33 PM
davidcampbell
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Quote:
Originally Posted by Stefan Buda View Post
That should be no problem, but why don't you just rip apart an old DVD drive, as most of them contain at least one small front surface mirror. It doesn't need to be more than 4mm wide.
Ah good idea!
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  #13  
Old 18-10-2021, 05:30 PM
Myrk511 (Kevin)
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Quote:
Originally Posted by Stefan Buda View Post
I can do the 8" for you if you can't find anyone suitable. I coat my own mirrors up to 10" and if someone approaches me I help if I can.
Hi Stefan,

I’ve a 10” mirror that desperately needs recoating. I’d also love to learn about the process. Please PM when you have a chance.

Cheers! Kevin
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