Why my Quark always refused to work...

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krakatoa1883
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Why my Quark always refused to work...

Post by krakatoa1883 » Tue Apr 16, 2019 3:37 pm

Since I purchased my Quark chromosphere in 2014 I realized that it is certainly not among the best units, I have always been forced to use of heavy sharpening and contrast masks to make chromosphere details visible, and my results have always been modest. As the etalon performance in Quark units can be very different from each other I thought my one have a too large BP or some defect in the tuning system. Eventually I modified my achromat with a Lunt PT module and this is my current setup, however I still use the Quark with my travel set. Today I casually discovered why my Quark performances were so poor.

The following is a raw, not processed, image of AR12738 I have taken this afternoon with my Quark and its original blocking filter
quark with original bf.jpg
quark with original bf.jpg (18.72 KiB) Viewed 170 times
and this is a raw image of the same region after the original BF has been removed and replaced with a Lunt BF1200
quark with BF1200.jpg
quark with BF1200.jpg (27.66 KiB) Viewed 170 times
OK, I am going to replace definitively the BF :lol:
Raf
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marktownley
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Re: Why my Quark always refused to work...

Post by marktownley » Tue Apr 16, 2019 4:51 pm

You can find the replacements here https://www.andovercorp.com/products/ba ... 600-699nm/

Part No. 656FS02-12.5

I replaced mine with the 25mm version...

Try a circular polariser too between the camera and quark, if the waveplates in the etalon are not perfectly aligned any 'leakage' will be polarised with respect to the primary output so it's contribution can be eliminated with a polariser. Any leakage like this will also reduce contrast.
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Re: Why my Quark always refused to work...

Post by krakatoa1883 » Tue Apr 16, 2019 5:25 pm

Thanks Mark, I am contacting the Italian representative of Andover to purchase the replacement. How did you mount the 25mm for using with it your Quark ?
Raf
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Re: Why my Quark always refused to work...

Post by marktownley » Tue Apr 16, 2019 8:31 pm

Hi Raf,

I mounted the 25mm andover in the cell from a real cheapie barlow lens (throwing the lens away) and then mounted that on a 2" to 1.25" filter adapter https://www.365astronomy.com/365Astrono ... apter.html I then replaced the 2" snout on the Quark with a slightly longer one and screwed it all together.

Mark
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Re: Why my Quark always refused to work...

Post by Valery » Wed Apr 17, 2019 8:01 am

marktownley wrote:
Tue Apr 16, 2019 4:51 pm
You can find the replacements here https://www.andovercorp.com/products/ba ... 600-699nm/

Part No. 656FS02-12.5

I replaced mine with the 25mm version...

Hi Mark,

What was the reason you have replaced it in your Quark?


Valery
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Re: Why my Quark always refused to work...

Post by pedro » Wed Apr 17, 2019 12:26 pm

My Chromosphere Quark was send back for replacement/repair. I will get it back this month. I guess this is not a surprise to most of us...

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Re: Why my Quark always refused to work...

Post by marktownley » Wed Apr 17, 2019 3:28 pm

Valery wrote:
Wed Apr 17, 2019 8:01 am
marktownley wrote:
Tue Apr 16, 2019 4:51 pm
You can find the replacements here https://www.andovercorp.com/products/ba ... 600-699nm/

Part No. 656FS02-12.5

I replaced mine with the 25mm version...

Hi Mark,

What was the reason you have replaced it in your Quark?


Valery
I wanted the larger versions so it sat higher in the exit beam from the HaT, and, I also figured with 2 blocking filters (based on experience) that one would have a higher transmission than the other, which it did, and it was the larger one that let more light through.
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Re: Why my Quark always refused to work...

Post by Montana » Thu Apr 18, 2019 11:48 am

Mark, you would do well setting up a business making custom filters and repairs :)

Alexandra

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