"Coated" Lunt BG38 Blue filter?????

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Merlin66
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"Coated" Lunt BG38 Blue filter?????

Post by Merlin66 » Wed May 06, 2020 1:28 am

https://luntsolarsystems.com/shop/solar ... g-filters/

I see there are reports, on SGL, that the replacement Lunt "Blue" filters for the BF assembly are "coated" for additional protection..
I'm unable to confirm.
Does anyone have some confirmation details on this filter's current construction?????


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Re: "Coated" Lunt BG38 Blue filter?????

Post by marktownley » Wed May 06, 2020 5:31 am

Doesn't look coated in the Lunt pic in the link. Looks like normal BG38 to me. What has SGL got to say?


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Re: "Coated" Lunt BG38 Blue filter?????

Post by Merlin66 » Wed May 06, 2020 6:13 am

In a recent post he says:
"""
Lunt were able to tell me that the blue glass is a UV Cut filter.

The newest version has a coating to inhibit this build up.

They also confirmed it was OK to try and clean the old BG filter and suggested CLR.
"""
I'm following it up with "Anthony" the member on SGL.....


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Re: "Coated" Lunt BG38 Blue filter?????

Post by DeepSolar64 » Wed May 06, 2020 5:53 pm

CLR? Awesome!!! You can clean them!


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Re: "Coated" Lunt BG38 Blue filter?????

Post by marktownley » Wed May 06, 2020 7:33 pm

DeepSolar64 wrote:
Wed May 06, 2020 5:53 pm
CLR? Awesome!!! You can clean them!
Yeah, it's all based on soda glass, so it just effectively oxidizes on the surface. Straightforward to remove.


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Re: "Coated" Lunt BG38 Blue filter?????

Post by DeepSolar64 » Thu May 07, 2020 5:38 pm

That's really good to know. This applies to both Lunt and Coronado BFs?


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Re: "Coated" Lunt BG38 Blue filter?????

Post by Merlin66 » Fri May 08, 2020 8:14 am

No, the Coronado ITF is a completely different design.
If it fails, the Maier Photonics replacement is a drop in replacement.


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Re: "Coated" Lunt BG38 Blue filter?????

Post by DeepSolar64 » Mon May 11, 2020 5:43 pm

The Coronado BFs cannot be cleaned off if they oxidize?


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Re: "Coated" Lunt BG38 Blue filter?????

Post by marktownley » Mon May 11, 2020 6:32 pm

DeepSolar64 wrote:
Mon May 11, 2020 5:43 pm
The Coronado BFs cannot be cleaned off if they oxidize?
No. The Coronado ITF is a laminated filter, the oxidation occurs between the layers. These are bonded with an epoxy and cant be separated.


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Re: "Coated" Lunt BG38 Blue filter?????

Post by DeepSolar64 » Mon May 11, 2020 6:36 pm

marktownley wrote:
Mon May 11, 2020 6:32 pm
DeepSolar64 wrote:
Mon May 11, 2020 5:43 pm
The Coronado BFs cannot be cleaned off if they oxidize?
No. The Coronado ITF is a laminated filter, the oxidation occurs between the layers. These are bonded with an epoxy and cant be separated.

Well Lunt has it on Coronado over that. Do you have a link for Maier Photonics if I ever need it?


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Traq 60mm with Baader AstroSolar film
Lunt, Coronado, TeleVue, Orion, Celestron and Sears eyepieces

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Re: "Coated" Lunt BG38 Blue filter?????

Post by marktownley » Mon May 11, 2020 6:40 pm



Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: "Coated" Lunt BG38 Blue filter?????

Post by DeepSolar64 » Tue May 12, 2020 4:48 pm

Thank you for the link, Mark. I will save it for sure.


Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Traq 60mm with Baader AstroSolar film
Lunt, Coronado, TeleVue, Orion, Celestron and Sears eyepieces

Image Visual Observer

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