Andrew Burwell created a new topic ' EQ6R-Pro & Indi' in the forum. 1 month ago

Does anyone have any experience with this fairly new Sky-watcher mount? Is it compatible with the INDI drivers and EQMod? I need a little more mount capacity than my AVX has, and am considering the options for the next weight class up to 45-50 lbs.

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Andrew Burwell replied to the topic 'Second night out with KSTARS/EKOS' in the forum. 2 months ago

That's not too far off from where I'm at in terms of how my unprocessed stretched calibrated images look. There are some features in PixInsight that can tackle the noise issue. One thing you can do is extract the luminance, adjust the curves so that all the background of the luminance is dark, and only the stars and object show through. Then use that as a mask on the color image to desaturate and darken the background, which removes all that noise color, then apply MultiScaleLinearTransform to blur that noise into a generally solid smooth color. Then reverse the mask and increase the contrast and color on the stars and objects you imaged without effecting the background.

Also, and this can't be stated enough, the worse your light pollution, the more integration time you need. I would push your times to 6-8 hours of data and see how much that improves your images. Imaging the same object over multiple nights feels like a misuse of a clear night, but if you're interested in better quality, this is what you need to do.

One other thing with regards to imaging. Some online studies by really diligent amateurs have shown that running the ASI1600 at -20C cuts noise in half. So that's something minor you can do right way. And, regarding mono. One way to battle light pollution is to shoot narrowband (which mostly limits you to nebulas). Narrowband images at frequencies that are not effected by light pollution and the moonlight. Depending on the filters you use, they can be to some degree, but the better filters block 95% or more of the light pollution and moon glow.

Also, I find Astro Pixel Processor (for me) is better than PixInsight for integration, light pollution removal, and color calibration. I then take it into PixInsight and enhance everything with their very unique tools.

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Andrew Burwell replied to the topic 'Second night out with KSTARS/EKOS' in the forum. 2 months ago

El Corazon wrote: www.indilib.org/support/community/photos...um.html?albumid=1901
Sorry, I haven't figured out how to link to that full frame image. Here the link to the entire album in my profile. Just select the Leo Triplet image there to get a larger view.
Are you using a light pollution suppression filter in addition to LRGB?


No light pollution filter on this particular image, though I have used one extensively in the past on my one shot color camera. Your camera and integration time can certainly have an effect, but also you probably have more signal noise due to light pollution, so that means you'll need more integration time to counter for it. Also, your processing technique can certainly effect the final quality as well, though looking at your images, there's so much noise I'm inclined to believe this is the removal of the light pollution that's causing this.

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Andrew Burwell replied to the topic 'Second night out with KSTARS/EKOS' in the forum. 2 months ago

Thanks! I don't know what happened with your image, it shows up as a tiny thumbnail. Can you relink it?

It's taken some time to get to this level of quality. I'm going through some of my first shots with my 102, and ugh, they're terrible. Haha.

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Andrew Burwell replied to the topic 'First time issues with automated focusing' in the forum. 2 months ago

knro wrote: I've actually had similar experience with the dust motes. I ended up shooting flats immediately after a filter capture is complete. Now that I think about it again... It might be a good idea to store the filter offset for each filter somewhere and then when flats for that filter are taken, the filter is moved to the position.... Ok I'll add this to my TODO list.

Regarding ADUs, I take it at 25k personally, some even suggest going higher. IMO, it's not an exact science as some might claim so it would take a bit of trial and error to see what works best for your optical train.


What's the difference between storing the offset, versus the absolute position of the filter? Would the absolute position be more accurate, if for instance you accidentally moved the focuser before you shot flats?

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Andrew Burwell replied to the topic 'Re:First time issues with automated focusing' in the forum. 2 months ago

TallFurryMan wrote: I'm far from being an expert at this, but to me flats provide correction for dust/vignetting located on the optical path between lens and photosites. Thus focus shouldn't have any impact because that path is moving as a whole during that process, except for the the scattering of light over the sensor. But I can't see any reason to change the focus for flats neither. I suppose the type of optics would also make a difference, doublet or triplet refractors for instance. Still, I'm no expert at this.

-Eric


You're right in that the focuser is moving all imaging gear as a whole. But it's distance from the objective, which you are shooting through, changes. Thus the focus of any object through the objective, or dust on the objective, changes relative to the distance from the focuser. That's my understanding anyway.

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Andrew Burwell created a new topic ' First time issues with automated focusing' in the forum. 2 months ago

This is my first time using automatic focusing in EKOS. Typically, I focus once, then never touch it again, and I've not had issues with my flats. But my first imaging session, I did one full set of L, then focused, then did RGB all at the same focus. Then I did all my flats at my last focus setting, which was what RGB were set to.

If I don't take my flats at the proper focus, I would assume dust motes would not correct out of the image properly?

Hence, the below stretched Luminance image showing uncorrected dust motes.



And then this stretched Green showing no dust motes. Red and Blue also didn't have any.




If you are automating the process of capturing with refocus either for temperature changes or filter changes, then how do you account for the focus setting? Is this information saved somewhere in the image, or can it be appended to the file name?

Also, I took the flats at 20k ADU, which has been typical for me in the past, but as you can see vignetting wasn't fully uncorrected in these images. What's the best way to understand the proper ADU for your flats to correct properly?

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Andrew Burwell replied to the topic 'Second night out with KSTARS/EKOS' in the forum. 2 months ago

And here’s the first image I captured over the two nights. Only 4.5 hours of integration.

get.jpg?insecure

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Andrew Burwell replied to the topic 'ZWO on Raspberry Pi doesn't connect' in the forum. 2 months ago

gth871r wrote: I did a 'apt-get dist-update' and suddenly it works. I have no idea why but i'll take it.


Curious to know how well this works for you on PI. I have the same camera, as well as the ASI224 for guiding. Both are USB3, and knowingly work better with the additional bandwidth of USB3, so curious to hear how it runs on a USB2 system, as I'd like to get a PI system running at the telescope if I could make it work. I would think for DSO photography it shouldn't be much of an issue since you are not sending lots and lots of data except every few minutes when a frame is captured.

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Andrew Burwell replied to the topic 'Polar Alignment Assistant Tool without Polaris' in the forum. 2 months ago

I have this problem too. My mount has a good routine to handle this with it's All Star Polar alignment routine. But I've never understood why you need to be at Polaris to align. Presumably it's due to the stars rotating, making it more difficult to get an alignment process complete within an acceptable time frame. But I always wonder why if you know precisely where the stars are, why you couldn't do a polar align from another star because you know it's relation to Polaris and the pole.

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Andrew Burwell replied to the topic 'First night out with KSTARS/EKOS' in the forum. 2 months ago

Yes, this was enabled. I'll try it out this evening to see if that fixes it.

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Andrew Burwell replied to the topic 'First night out with KSTARS/EKOS' in the forum. 2 months ago

knro wrote: Dithering happens between frames and not during capture, so it shouldn't cause your frames to become blurry. Maybe logs could shed a light on this.


I'm not sure why this happened. I used the default settings, but it looked like it was constantly dithering during the 60 second exposures. Each image had stars that looked like z shape. I'll attempt it again and see if I can log it.

I also ran into another issue with the internal guider now that I got it working. For long periods of time the image coming from the camera would be black, and would periodically go back to showing a normal image of the stars. When it was black, even for 5 minutes at a time, the guiding continued to work as if it still was tracking the star. See attached images of dithering example, and my guiding panel screen with the black image.




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Andrew Burwell replied to the topic 'First night out with KSTARS/EKOS' in the forum. 2 months ago

The LUMA setting worked for me (I must have overlooked this before), and now I'm able to guide with the internal guider. I attempted dithering, but all my frames were blurry until I turned it off. So, I'm not quite sure how to set this up.

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Andrew Burwell replied to the topic 'Second night out with KSTARS/EKOS' in the forum. 2 months ago

One other question that just came to my mind. If a sequence fails during operation, what is the best course of action to take? Should you save the progress of the sequence, restart EKOS, then load that aborted sequence to continue?

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