Daystar Quark banding problem UPDATE

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
Post Reply
User avatar
Astrograph
Im an EXPERT!
Im an EXPERT!
Posts: 200
Joined: Tue Aug 05, 2014 1:00 pm
Location: London
Contact:

Daystar Quark banding problem UPDATE

Post by Astrograph » Thu Aug 28, 2014 4:48 pm

Dear All

Following our hope that problems with Quarks were all behind us, the last batch received had banding problems which caused considerable problems.

After many emails to and from customers (thanks for the input) and Daystar, we finally have a resolution. The problem has been explained as follows by Daystars owner; This information has also been posted by Daystar on other forums.

This last batch apparently had very tight bandpass coatings on the etalons. This resulted in bandpass typically <0.3A (in one case as low as 0.14A)! The lightness / darkness seen in the etalon is a function of FWHM and the coating thickness on the etalon.

To explain this a +/- 0.2A variation on a 0.5A FWHM coating is an 8% variation which should not be discernible. A +/- 0.2A variation on a 0.15A FWHM coating is 26% which is very obvious and shows this banding.

Daystar have therefore decided that all the latest batch and what is in stock is out of specification and will therefore be replaced. All our customers that have reported banding problems will get a replacement which Daystar are sending out in advance allowing customers to hang on to their Quarks until they can be replaced.

Daystar are now going to maintain Quark production within the 0.5~0.3A range they originally advertised and not pursue ultra tight band pass until variations in the coating thickness can be overcome.

Best Regards

Rupert
Astrograph Ltd

User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Daystar Quark banding problem UPDATE

Post by swisswalter » Fri Aug 29, 2014 3:45 am

Hi Rupert

thank you for the information
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

User avatar
GreatAttractor
Almost There...
Almost There...
Posts: 585
Joined: Sat Jun 01, 2013 1:04 pm
Location: Poland

Re: Daystar Quark banding problem UPDATE

Post by GreatAttractor » Fri Aug 29, 2014 4:19 am

Definitely count me in when Daystar starts making 0.15 Å Quarks with 2x magnification :D
My software:
Stackistry — an open-source cross-platform image stacker
ImPPG — stack post-processing and animation alignment
My images

SW Mak-Cass 127, ATM Hα scope (D=90 mm, LS50 etalon), Lunt LS50THa, ATM SSM, ATM Newt 300/1500 mm, PGR Chameleon 3 mono (ICX445)

User avatar
marktownley
Librarian
Librarian
Posts: 24536
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: Daystar Quark banding problem UPDATE

Post by marktownley » Fri Aug 29, 2014 7:33 am

Thanks for the info Rupert
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!

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3053
Joined: Sun Nov 18, 2012 3:13 pm

Re: Daystar Quark banding problem UPDATE

Post by Valery » Fri Aug 29, 2014 5:13 pm

Hi solar gangs,

Can someone explain me what does this mean. My english does not allow to interprete this without a doubt.

"Daystar have therefore decided that all the latest batch and what is in stock is out of specification and will therefore be replaced. All our customers that have reported banding problems will get a replacement which Daystar are sending out in advance allowing customers to hang on to their Quarks until they can be replaced."

Does the DayStar offer the etalons or QUARK as the replacement for the period of servicing of the defective units????

Imagine, I got a QUARK with banding. Then what? I let DayStar know that my QUARK has a banding. What will be then? And what will be if I bought the QUARK directly from the DayStar?


Thanks,

Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

User avatar
Bill Edelen
Ohhhhhh My!
Ohhhhhh My!
Posts: 122
Joined: Mon Mar 03, 2014 6:12 pm
Location: NJ. US

Re: Daystar Quark banding problem UPDATE

Post by Bill Edelen » Fri Aug 29, 2014 8:28 pm

If you have a QUARK from last batch made....Daystar will send you a new one to keep. Once you get it you send the ole one back to them and they keep the old one.

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3053
Joined: Sun Nov 18, 2012 3:13 pm

Re: Daystar Quark banding problem UPDATE

Post by Valery » Sat Aug 30, 2014 4:07 pm

Bill Edelen wrote:If you have a QUARK from last batch made....Daystar will send you a new one to keep. Once you get it you send the ole one back to them and they keep the old one.
Thanks for explanation.


Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

User avatar
Astrograph
Im an EXPERT!
Im an EXPERT!
Posts: 200
Joined: Tue Aug 05, 2014 1:00 pm
Location: London
Contact:

Re: Daystar Quark banding problem UPDATE

Post by Astrograph » Fri Oct 03, 2014 11:08 am

Dear All

With regard to the Daystar Quark, Daystar would like anyone with any queries or concerns regarding their Quark to look at the information provided on the official Daystar website.

Quark Link - http://www.daystarfilters.com/Quark.shtml
Quark Uniformity Link - http://www.daystarfilters.com/Quark/Qua ... mity.shtml
Terms of sale / advance replacements - http://www.daystarfilters.com/termof.shtml

One thing I need to clarify with our original post is the following

All our customers that have reported banding problems will get a replacement which Daystar are sending out in advance allowing customers to hang on to their Quarks until they can be replaced.

This was a service offered to help out our own customers. It was not Daystars official policy which is outlined in the links above.

User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Daystar Quark banding problem UPDATE

Post by swisswalter » Sat Oct 04, 2014 6:36 am

Hi Rupert

thank you very much for the information.

It is difficult to detect, recheck and note an severe uneveness withhin 10 days if the sun comes up only once or twice for a couple of hours a month ;)
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

axlefoley
Im an EXPERT!
Im an EXPERT!
Posts: 284
Joined: Thu Feb 13, 2014 3:22 am
Location: Townsville Australia

Re: Daystar Quark banding problem UPDATE

Post by axlefoley » Sat Oct 04, 2014 6:58 am

I don't do imaging yet but will in the near future, so how do I tell if mine is a problem one.
Alan

User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 3053
Joined: Sun Nov 18, 2012 3:13 pm

Re: Daystar Quark banding problem UPDATE

Post by Valery » Sat Oct 04, 2014 10:00 am

axlefoley wrote:I don't do imaging yet but will in the near future, so how do I tell if mine is a problem one.
Point it at the center of the sun and move the sun across the FOV. If your Quark has a banding, you will see this easily.
To be more sure, use this method with two or three different magnifications.

Note, that slight banding or unevenness visible visually, will be _significantly_ more pronounced when imaging.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

axlefoley
Im an EXPERT!
Im an EXPERT!
Posts: 284
Joined: Thu Feb 13, 2014 3:22 am
Location: Townsville Australia

Re: Daystar Quark banding problem UPDATE

Post by axlefoley » Sat Oct 04, 2014 10:27 am

Thanks Val I will give it a go.
Alan

danrwillard
The Sun?
The Sun?
Posts: 1
Joined: Tue Nov 24, 2015 8:49 pm

Re: Daystar Quark banding problem UPDATE

Post by danrwillard » Tue Nov 24, 2015 9:19 pm

Just starting with quark Chomoshpere on my ES 127mm refractor. I have just got to the point of getting fair focus (adjusting the "knob"). Can someone tell me what this "banding problem" looks like? I do seem to see wide perpendicular bands of lighter/darker areas going across the face of the sun.
Dan

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests