Advice requested on Quantum filter purchase

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torsinadoc
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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »

9858C886-FC7B-4A1A-B244-746243795089.jpeg
9858C886-FC7B-4A1A-B244-746243795089.jpeg (83.35 KiB) Viewed 2329 times
They tuned some settings on the quantum. Here is the test result. It will be cloudy for a few days so won’t be able to test


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Re: Advice requested on Quantum filter purchase

Post by marktownley »

Hope it works well for you!


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Re: Advice requested on Quantum filter purchase

Post by christian viladrich »

Just wondering whether you could post a larger version of the test report ?


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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »



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Re: Advice requested on Quantum filter purchase

Post by Ljungmann »

Looks great on paper Alan. I hope it will live op to expectations! I love my SS 0.3 filter. Great Views.


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Re: Advice requested on Quantum filter purchase

Post by christian viladrich »

Yes indeed, it looks good on paper :-)


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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »

I am red green color blind so the FWHM CWL were difficult to interpret. This is the same etalon from my earlier post. I assume this means there was uneven heating or user error (gasp). I hope their "tweaks" fixed the issue.


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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »

I was finally able to test. If you recall, the last version drifted off band when it was pointed at the sun. I ran a 30 minute animation to see if there was a drift. This test was at F28 and I used my powermate (I am still waiting for a Baader TZ3).

Set up: 102 F 11, Baader DERF, Baader UVIR, Quantum (F28), basler 155. This is sharpened in ImPPG.

https://astrob.in/full/ypx99b/0/


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Re: Advice requested on Quantum filter purchase

Post by rsfoto »

torsinadoc wrote: Sat Mar 20, 2021 8:46 pm I was finally able to test. If you recall, the last version drifted off band when it was pointed at the sun. I ran a 30 minute animation to see if there was a drift. This test was at F28 and I used my powermate (I am still waiting for a Baader TZ3).

Set up: 102 F 11, Baader DERF, Baader UVIR, Quantum (F28), basler 155. This is sharpened in ImPPG.

https://astrob.in/full/ypx99b/0/
Hi,

I looked at your animation and I see a shift from more detailed to less detailed or viceversa as I do no know where is the start or the end of the test.


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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »

rsfoto wrote: Sat Mar 20, 2021 11:07 pm
torsinadoc wrote: Sat Mar 20, 2021 8:46 pm I was finally able to test. If you recall, the last version drifted off band when it was pointed at the sun. I ran a 30 minute animation to see if there was a drift. This test was at F28 and I used my powermate (I am still waiting for a Baader TZ3).

Set up: 102 F 11, Baader DERF, Baader UVIR, Quantum (F28), basler 155. This is sharpened in ImPPG.

https://astrob.in/full/ypx99b/0/
Hi,

I looked at your animation and I see a shift from more detailed to less detailed or viceversa as I do no know where is the start or the end of the test.
Sorry. Here is the version without a loop. I had pretty variable seeing (I had image around noon)

https://www.astrobin.com/full/ypx99b/B/?nc=user


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Re: Advice requested on Quantum filter purchase

Post by marktownley »

That looks very good Alan!


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Re: Advice requested on Quantum filter purchase

Post by Bob Yoesle »

Hi Alan,

Just came back to this thread from another post. Looking at the test report, the numbers indicated seem great. But when you measure the plot of the full aperture FWHM, it seems to tell a little different story.

I copied your link to the DayStar test report. I measured where the FWHM should lie, and the FWHM was then highlighted by a blue bar. This very same blue bar was copied identically to measure along the lower left-hand base of the graph, and you can see approximately 6.6 FWHMs fit end-to-end to reach 5 A. This indicates a full aperture FWHM of ~ 0.75 A, not 0.30 A as specified on the test report:

Alan D Test Report 2.png
Alan D Test Report 2.png (154.79 KiB) Viewed 1945 times


Since you have the original report and therefore access to the highest resolution test report image, you may want to repeat this exercise to see what you come up with. I grant that this methodology is crude, but it does raise some questions about the test report and how the data stated and figures shown are arrived at. And given this plot would or should be the ideal in a fully collimated or perfect telecentric system at f50+, this causes me to have additional concern as to what the filter actually provides "real world" versus "on paper:"

FWHM-N.jpg
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Re: Advice requested on Quantum filter purchase

Post by christian viladrich »

Hi Bob,
As you said this discrepancy within the test report is unfortunatly noted on many other reports. So the question is what is the measuring protocole used by DayStar ?

It looks as if the FWHM claimed at the top of the report comes from FWHM measurements made through small size aperture (3 mm ?), averaged over the full aperture. If this is so, then it would be wrong since the CWL also changes accross the full aperture of the etalon.

On the other side, the FWHM measured over the full aperture of the etalon (transmission graph at the botton of the report) includes variation of the CWL over the full aperture of the etalon, so a much larger (and relevant) FWHM.

In any case, it would be good to know ...


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Re: Advice requested on Quantum filter purchase

Post by torsinadoc »

Im printing a few adapters and will test it at F52 with my baader TZ3.


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Re: Advice requested on Quantum filter purchase

Post by Bob Yoesle »

I'd compare the contrast at f50 with a front mounted 0.7 A air-spaced of known quality and see how they compare...


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Re: Advice requested on Quantum filter purchase

Post by Ljungmann »

Hi Bob!
In my test rapport from Daystar after the upgrade to a new Quantum house + new blocker and trimmer I did try to look at the data again using your measurement. It is a 0.6A SE filter with a Del Woods etalon. And the result shows a full Aperture FWHM of 0.61A
I am not surpriced because thats what I do see in the real word.


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