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Bubbles

Posted: Sun Jan 10, 2021 4:43 pm
by krakatoa1883
After only one year of use my Lunt B1200 BF developed bubbles and other defects in the cement between the elements, they are visibile as superimposed on the solar images and are very annoying. I am very disappointed because I always treated the filter with great care and my other B600 which is four years old is instead still perfect.

In my microscopy arsenal I have both solvents and optical cements, so I wonder if I can detach the glasses and replace the cement by myself, but I would not like risking to damage the coating. Has anyone already tried this kind of surgery on a BF ? Thanks.

Re: Bubbles

Posted: Sun Jan 10, 2021 5:09 pm
by rsfoto
krakatoa1883 wrote: ā†‘
Sun Jan 10, 2021 4:43 pm
After only one year of use my Lunt B1200 BF developed bubbles and other defects in the cement between the elements, they are visible as superimposed on the solar images and are very annoying. I am very disappointed because I always treated the filter with great care and my other B600 which is four years old is instead still perfect.

In my microscopy arsenal I have both solvents and optical cements, so I wonder if I can detach the glasses and replace the cement by myself, but I would not like risking to damage the coating. Has anyone already tried this kind of surgery on a BF ? Thanks.
Hi,

I would contact Lunt and show them what happened in order they can replace it ...

You have a 5 year warranty according to what I just read on their website.

https://luntsolarsystems.com/warranty/

Re: Bubbles

Posted: Sun Jan 10, 2021 6:00 pm
by Highbury Mark
Are you based in Europe? Presuming Italy? As Rainer says, Iā€™m sure if you contact Lunt Europe (via Bresser in Germany) they will either fix it or provide a replacement.

Re: Bubbles

Posted: Mon Jan 11, 2021 4:39 pm
by krakatoa1883
Thanks for your answers, I just wanted to explore a different solution than sending the item to Bresser, however I thinks that this is still the best thing to do.

Re: Bubbles

Posted: Mon Jan 11, 2021 5:58 pm
by Highbury Mark
Really excellent website you have - together with some great telescopes. I shall add it to my ever growing list of online solar resources. And good luck with the blocking filter.

Re: Bubbles

Posted: Mon Jan 11, 2021 6:54 pm
by marktownley
Looks like rust to me!

Re: Bubbles

Posted: Tue Jan 12, 2021 4:00 pm
by krakatoa1883
Hi Mark, it's not rust they are bubbles in the glue between the elements, the external surfaces are perfect.

Re: Bubbles

Posted: Tue Jan 12, 2021 6:00 pm
by marktownley
krakatoa1883 wrote: ā†‘
Tue Jan 12, 2021 4:00 pm
Hi Mark, it's not rust they are bubbles in the glue between the elements, the external surfaces are perfect.
Gotcha. I can't think of any fix you can do other than a return and replace from point of purchase.

These things shouldn't happen though...