Possible damage on BF600?

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04Stefan07
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Possible damage on BF600?

Post by 04Stefan07 » Thu Oct 19, 2017 11:18 am

I inspected my blocking filter 600 the other night and found this disturbing blemish on the glass.

This doesn't look good. I contacted Lunt but still haven't heard back from them so I thought I would share the problem here.

Anyone seen this before?
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Photo 18-10-17, 20 29 35.jpg
Photo 18-10-17, 20 29 35.jpg (327.15 KiB) Viewed 811 times
SOLAR SCOPE: Lunt LS50THa Pressure Tuned including B600 filter
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Re: Possible damage on BF600?

Post by [whrudey] » Thu Oct 19, 2017 8:43 pm

Looks like "crud". Had this problem a few years ago and Rikk, at Lunt was very helpful o in offering to replace the BF. Meanwhile, I tried cleaning the BF using rust remover and, it worked.

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Re: Possible damage on BF600?

Post by [whrudey] » Thu Oct 19, 2017 9:04 pm

Looks like "crud". Had this problem a few years ago and Rikk, at Lunt was very helpful in offering to replace the BF. Meanwhile, I tried cleaning the BF using rust remover and, it worked.

Here's my "crud".
IR Filter.jpg
IR Filter.jpg (47.28 KiB) Viewed 789 times
Here's the Rust Gel - aka Naval Jelly.
Rust gel.jpg
Rust gel.jpg (15.39 KiB) Viewed 789 times
Here's an image before the "crud".
before.jpg
before.jpg (64.47 KiB) Viewed 789 times
Here's an image with the "crud".
during.jpg
during.jpg (48.7 KiB) Viewed 789 times
Here's an image when the "crud was cleaned off with the Rust Gel.
after.jpg
after.jpg (76.9 KiB) Viewed 789 times

Apparently, this is a common problem. Since the "tint" in the BF is through and through, the outside is almost indestructible.

Hope this helps.

Bill

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Re: Possible damage on BF600?

Post by bart1805 » Thu Oct 19, 2017 9:24 pm

That is not the Blocking Filter I guess, but the "blue glass" on the side of the prism that is facing the telescope. If it is still under warranty you can contact Lunt. They will replace it. Or let them send you a new one, it is very easy to install.

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Re: Possible damage on BF600?

Post by [whrudey] » Thu Oct 19, 2017 10:04 pm

bart1805;

Actually, it is the IR/UV "blocking filter". Try my suggestion out - what have you got to lose other than waiting for the replacement to arrive ? Trust me, I've been there and done that. Remember, it will happen again in the future.

Bill

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Re: Possible damage on BF600?

Post by bart1805 » Thu Oct 19, 2017 10:26 pm

Hi Bill,
According to Lunt:
This is the BG Filter – the Schott-designed BG (Blue Glass) filter. This filter is also created to absorb any residual IR.

But yes, your suggestion is what I myself would do. Contact Lunt and get a new one. And in the meantime clean it like you describe.
Bart.

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Re: Possible damage on BF600?

Post by [whrudey] » Thu Oct 19, 2017 11:25 pm

Semantics aside, the important issue is what to do to keep imaging. I live in the Caribbean where shipping is always an issue in terms of time/delays as well as keeping the customs folks happy. Pleased to hear that you agree.

Bill

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Re: Possible damage on BF600?

Post by Dave S » Fri Oct 20, 2017 12:14 am

I also had that happen and Lunt sent me a new BG glass.

Mine clouded over after I had left the scope outside on a high heat and humidity day. At the time, I wondered if condensation was the cause of the crud.

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Re: Possible damage on BF600?

Post by 04Stefan07 » Wed Mar 28, 2018 3:33 am

I received my replacement glass in the mail, it took months for Lunt to send it.

Just need to swap it over.
SOLAR SCOPE: Lunt LS50THa Pressure Tuned including B600 filter
MOUNTS: Skywatcher HEQ5 Pro & Skywatcher Star Adventurer
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Re: Possible damage on BF600?

Post by pedro » Wed Mar 28, 2018 8:13 pm

I had a similar problem a few years ago. It was solved by soaking the ITF in baader cleaning fluid (B3400)

See below, before and after cleaning
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lunt_152_b3400_20120820-01.jpg
lunt_152_b3400_20120820-01.jpg (292.17 KiB) Viewed 490 times

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Re: Possible damage on BF600?

Post by 04Stefan07 » Thu Aug 09, 2018 4:07 am

Crap, I need to be more active on here haha.

I replaced the glass with the replacement Lunt gave me and all good!
SOLAR SCOPE: Lunt LS50THa Pressure Tuned including B600 filter
MOUNTS: Skywatcher HEQ5 Pro & Skywatcher Star Adventurer
CAMERA: Flea3 1.3 MP Mono USB3 Vision (VITA 1300) & QHY5L-II Mono

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