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PDB
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Question

Post by PDB » Wed Jun 06, 2018 12:37 pm

for the ones that know a lot more than I do ...

Did some capturing today under a bright blue sky, seeing could be better, with the Skywatcher 100 f/8.3 and the "bad" Quark to do some tests again. Made some flats to get rid of the uneven images and other defaults in the filter.

When looking at the following image I suspected the Quark again of having some "clouded" regions. (not 100% sharp image)
IMPPG_2018-06-06_T_11-39-38-0371_HA_lapl5_ap9416.jpg
IMPPG_2018-06-06_T_11-39-38-0371_HA_lapl5_ap9416.jpg (296.5 KiB) Viewed 596 times
But then I processed an earlier image (taken app. 35 minutes earler) from the same region (There is a little offset, and this one is also a bit sharper)

No "clouded" areas on this one ...
IMPPG_2018-06-06_T_11-03-05-0887_HA_lapl5_ap9292.jpg
IMPPG_2018-06-06_T_11-03-05-0887_HA_lapl5_ap9292.jpg (378.5 KiB) Viewed 596 times
To show the difference I tried to align both in an animated gif
Anim2.gif
Anim2.gif (488.34 KiB) Viewed 596 times

Now the question: Is this the Quark changing band while heating. The heater was at the same position in both, but the Sun had been warming the Quark as well for 30 minutes through the 35nm H-Alfa filter (used as ERF in from of extension tube and diagonal), or is this really solar material getting out of that region. (fyi no clouds were covering the sky)

Regards,

Paul

PS: Some bonus from yesterday with a low Jupiter at app. 20°
2018-06-05-2107_6-PDB-L-Jup_AS_P5_lapl4_ap31.jpg
2018-06-05-2107_6-PDB-L-Jup_AS_P5_lapl4_ap31.jpg (10.04 KiB) Viewed 596 times

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Re: Question

Post by Montana » Thu Jun 07, 2018 6:39 am

It is only when you view the gif that it really shows the difference. I have no idea but it seems that it is not quite on band in the first shot. I found with my Quark that it was next to impossible to focus when it was even slightly off band as the contrast was so low. Then, Autostakkert always did a very poor job of stacking as the contrast was so incredibly low. My videos were always infinitely better than the stacked output and it should be the other way round. I am wondering if ASK3 is not stacking certain regions very well because of very poor contrast?

I love the Jupiter!
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Re: Question

Post by PDB » Thu Jun 07, 2018 7:28 am

Thanks Alexandra.

Yes sometimes AS!3 has problems stacking, but in this case seems to be in the capture. Have a look at the following image. This is a sceenshot of SER player showing 1 image from each video. Using the tools menu i altered gamma to get some more contrast. You can see the Quark is not really even and there are some spots. But notice the "cloudy" field on the bottom one. Quark and camera position did not change. (I had been making flats in between, so focus changed, and scope was not pointing at same exact position). The "cloudy" field is at a sensor position which is "clean" in the top one.
Schermafdruk.png
Schermafdruk.png (304.62 KiB) Viewed 558 times


Rgrds,

Paul

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Re: Question

Post by Montana » Fri Jun 08, 2018 6:40 am

Is there some condensation floating about in there?

Alexandra

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Re: Question

Post by PDB » Fri Jun 08, 2018 7:34 am

Wel it might very well be. (the contamination in not on the outside, and if you put some gentle pressure on the red filtter in the back it seems to change, at least I think)

P.

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Re: Question

Post by krakatoa1883 » Fri Jun 08, 2018 11:16 am

Paul,

my own Quark doesn't show any foggy zone, even when off band, so the behavior of your unit could be due to "something" trapped inside (I can't say exactly what and where) or to some inhomogeneities of the etalon. In the clear areas of your images your Quark doesn't seem to be badly off band.

Have you noticed if the foggy areas always appear in the same locations ?
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Re: Question

Post by PDB » Fri Jun 08, 2018 11:33 am

Have you noticed if the foggy areas always appear in the same locations ?
Looks like they are, but not always present. No time for further testing in the coming weeks, so have to "freeze" this subject for at least a month.

Rgrds,

Paul

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Re: Question

Post by Montana » Fri Jun 08, 2018 1:19 pm

All the best Paul and keep us updated when you can :)
Alexandra

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Re: Question

Post by Derek Klepp » Sun Jun 10, 2018 7:38 am

Paul I used to have similar issues with an old Daystar Solaredi 60mm scope .I used to rotate the etalon itself to try and rectify the problem.

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Re: Question

Post by PDB » Sun Jun 10, 2018 10:52 am

Hi Derek,

on my list of todos (when back from hospital) is to make a series of flats with 10 to 15 minute time-intervals, and do this in different Quark rotations.

Rgds,

Paul

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Re: Question

Post by Derek Klepp » Mon Jun 11, 2018 3:54 am

Good idea .

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Re: Question

Post by TheSkyBurner » Mon Jun 11, 2018 5:03 am

could be a little bit of fog from handling the quark with your bare hands. I have had the heat transfer from my palm and cast an immediate moisture accumulation onto my filters several times and it just evaporates when i take my hand away. Perhaps a similar problem.

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