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 Post subject: Freshly coated mirror
PostPosted: Sat Jun 07, 2014 8:10 pm 
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I just got my mirror back in the mail today from the coater. They did a nice job. I had worries about shipping it (not to mention it cost $200 to ship to CA and back!) but it survived. Looking forward to first light but before I install it, I want to find something like a large shower cap to cover it with so it doesn't oxidize so quickly (it's stored in the observatory which isn't insulated from the outside air very well). Any ideas on what to use for a 16" mirror?

Here's a pic of the fresh coat:


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PostPosted: Sun Jun 08, 2014 10:36 am 
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Low tack film? I've never done it, nor heard of others doing it, but I wonder if it would not only protect it from the air but also remove dust particles to keep it cleaner with every viewing. I'm thinking frisket film for artwork applications. Rolls of the stretchy film could go a long way. A $50 roll of this stuff could easily cover your mirror 50 times, for a value of $1 per disposable application. Not sure if this is exactly what you were thinking, though.

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PostPosted: Sun Jun 08, 2014 10:38 am 
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Iwata Frisket

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PostPosted: Sun Jun 08, 2014 10:46 am 
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That's an interesting idea, Jason- thanks! I never considered something like that. I'm not familiar with the product- would it not leave anything behind or pull anything (besides dirt, debris etc.) from the coating? I like the idea of it sitting against the mirror to fully protect it. With the SO2 we have in the air here (due to the volcano), things tend to rust, oxidize etc very quickly.

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PostPosted: Mon Jun 09, 2014 6:46 am 
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I'm absolutely NOT certain of what it could potentially do to the coatings. I'm also not specifically familiar with that brand, but I used frisket quite regularly in college to mask off areas for airbrushing, and even after sitting against paper for days I could pull it off with zero discernible damage to the paper. If it's low tack ( I now notice that one says medium tack, not sure if it's different or just a market term), it should be easy to pull without leaving the slightest residue. Another option would be Glad Press and Seal. It's got a funky super low tack quality that differs from standard plastic wraps like Reynold's brand. Again, though, being a poly based plastic material I'd look into the chemical interactions before risking on top of your coatings.

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PostPosted: Mon Jun 09, 2014 4:12 pm 
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Thanks Jason. :cool:

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PostPosted: Mon Jun 16, 2014 12:57 pm 
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How about this? I wonder if it would keep the mirror coating fresh since it's not airtight...

http://www.amazon.com/gp/aw/d/B005O9MIX ... SY165_QL70

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Homebuilt 16" Truss Dob
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SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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PostPosted: Tue Jun 17, 2014 4:13 am 
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Looks cool. I'm obviously not sure if limiting airflow is better or worse for the longevity of your coatings. If dust particles make up the largest issue that looks like a fantastic solution.

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PostPosted: Tue Jun 17, 2014 7:28 am 
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I'm a but unsure of that myself. It's strange becAuse the secondary mirror coatings still look perfect and I just have that covered with a Crown Royal whiskey pouch which certainly isn't airtight. But I'm not sure if the reason that it's done better is because it's hanging upside down ( since scope is usually left pointed upward). I think I'll try the cheap fan covers and see how they work. Worth a try I guess.

Thanks for the help. :cool:

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
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PostPosted: Tue Jun 17, 2014 10:00 am 
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No problem. It will be interesting to see how it works. It's gotta be better than doing nothing at all.

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PostPosted: Tue Jul 01, 2014 5:35 pm 
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Maybe you could spray clear coat onto the outside of the fan cover to seal it, or stretch Saran wrap over the fan cover. I'd say to stretch Saran wrap over the mirror directly but don't know how you could be sure to keep from accidentally contacting the mirror in the process of applying and removing it. Plus it would have to be a pain to deal with that way. The coating looks beautiful, by the way, so congratulations on getting good coating and on getting the mirror across the Pacific twice without incident!

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PostPosted: Tue Jul 01, 2014 6:05 pm 
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Thanks Doug! It was looking pretty bad. I center marked it but I'm still looking at different options to protect it before I reinstall it. Thanks for the ideas. :cool:

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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PostPosted: Wed Nov 12, 2014 5:56 pm 
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Looks awesome Erik :D

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PostPosted: Sun Nov 16, 2014 12:20 pm 
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Thanks! The new coatings make a big difference, especially on dim objects. Had a nice little session the other night.

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-Erik Wilcox
Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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