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Lou took this great image of a prom with his Lunt152 double stacked with a Quark

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Replacement Quark ERF

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Moriniboy
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Replacement Quark ERF

Post by Moriniboy » Sun Jul 07, 2019 5:41 pm

Hi,

Recently bought a quark prom second hand, its got a lot of problems (4 in total) but the worst turned out to be a failed ERF.

Anyone got a solution to this?

No idea of the age I'm afraid.

Regards Nigel
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krakatoa1883
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Re: Replacement Quark ERF

Post by krakatoa1883 » Sun Jul 07, 2019 7:27 pm

You mean the blocking filter, I see. You have to replace it, there is no other solution. Mine too degraded, I bought a new one from Andover.
Raf
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Moriniboy
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Re: Replacement Quark ERF

Post by Moriniboy » Sun Jul 07, 2019 8:45 pm

Thanks, assumed it was the ERF or is it a combined ERF and BF unit?
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krakatoa1883
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Re: Replacement Quark ERF

Post by krakatoa1883 » Mon Jul 08, 2019 9:56 am

Actually it does both jobs, cuts etalon harmonics and protects the etalon from excessive heat. Unfortunately this kind of filters are not designed specifically for solar observing and shall therefore be protected by using of some energy rejection device placed in front of them. Based on what occurred to my Quark BF I now think that a UV/IR cut filter as recommended by Daystar is not enough, a Baader 35nm filter would be much better.
Raf
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Moriniboy
Oh, I get it now!
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Re: Replacement Quark ERF

Post by Moriniboy » Mon Jul 08, 2019 10:12 am

Thanks
Hoping for clear skies.....lol

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