Could someone explain the blur in the image? | Astrobiscuit | Page 1

upbeat lynx Jul 13, 2023, 6:32 PM

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The blurryness in my photos has happened to me my past 3 astro projects and I dont know whats causing it. I know for a fact its not a focus problem as I spend a long time focusing with the asi air app as I do with all my images. I originally thought it was the location of the object because M8 is very low for me and I can only shoot it for a brief period, but so was the north american nebula when I shot it and look how sharp the north american nebula image is compared to M8. Keep in mind these were both captured with the exact same gear.

upbeat lynx Jul 13, 2023, 9:31 PM

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The only difference is NA nebula was shot with narrowban while M8 was unfiltered. Still don't see how that would make a difference as I was able to focus fine with and without filters.

full field Jul 14, 2023, 12:29 AM

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The Nebula region in the Lagoon/Trifid are relatively sharp. I'm not sure how effective BlurX will be on a jpeg though.

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Also, I think there's a bumble bee in your first image 😅

upbeat lynx Jul 14, 2023, 12:54 AM

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Sorry, theses were after i used sharpening software on M8. Probably an artifact. Heres the un sharpenned image.

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Heres the tiff

full field Jul 14, 2023, 12:56 AM

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I'll slap it around and see what I can do!

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oh, could you send the stacked result instead of one already stretched?

upbeat lynx Jul 14, 2023, 12:57 AM

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ye

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my bad

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If you want it right out of dss here it is

full field Jul 14, 2023, 12:58 AM

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that's the stuff 👍

full field Jul 14, 2023, 1:20 AM

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I think the stars are a result of whatever lens you may be using, or a combination of that and the pixel size of your camera.

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This was run through StarX, then stretched, ran through NoiseX, stars added back, then BlurX (XXX!)

upbeat lynx Jul 14, 2023, 1:22 AM

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How come my NA nebula image turned out so sharp then?

full field Jul 14, 2023, 1:24 AM

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You didn't have any dew on your lens shooting the lagoon?

upbeat lynx Jul 14, 2023, 1:24 AM

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No I didnt. I checked that before I started because I felt it may have been a previous calpurate.

full field Jul 14, 2023, 1:25 AM

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Weird. There's definitely some soft halos around the stars in that data. Perhaps it just comes down to atmospheric conditions (transparency/humidty/etc)

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When it gets humid here, my stars look very soft through each of my telescopes. It's almost like it's out of focus, but it's just as "good as it gets" during those times. I'm in the Northeast US, nealry perpetual clouds and high night time humidity all year except the winter 😄

upbeat lynx Jul 14, 2023, 1:28 AM

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Yeah im in the eastern US too. I shot my NA neb picture early in the summer with most likely better conditions.

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Guess I just have to deal with blurry images in the summer.

mossy thunder Jul 14, 2023, 3:18 AM

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upbeat lynx Yeah im in the eastern US too. I shot my NA neb picture early in the summer with...

Ayo were both images taken unfiltered?

upbeat lynx Jul 14, 2023, 4:05 AM

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NA neb was with l-enhance and lagoon was unfiltered

full field Jul 14, 2023, 4:21 AM

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You don't have a uv/ir filter to use?

mossy thunder Jul 14, 2023, 4:34 AM

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upbeat lynx NA neb was with l-enhance and lagoon was unfiltered

What lens/scope was used?

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L-enhance, and most other duo narrowband filters, reduce optical abberations in most cases, so when imaging unfiltered the abberations will look 10x worse. Also depending on your cam, whether it's DSLR or astro cam, you may need a UV/IR cut. Astro cams are sensitive to IR, which caused heavy bloat, or "blurriness" to images taken without a filter.

full field Jul 14, 2023, 5:14 AM

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My T7i is sensitive to IR 😦

mossy thunder Jul 14, 2023, 5:18 AM

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Yii if it's full spectrum

upbeat lynx Jul 14, 2023, 6:17 PM

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mossy thunder L-enhance, and most other duo narrowband filters, reduce optical abberations in ...

I was using a 135 mm Rokinon f 2.0 stopped down to f2.8. My cam was ZWO ASI533MC.

mossy thunder Jul 14, 2023, 6:45 PM

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Yea def go with a 2" UV/IR cut filter, the Lagoon data, from what I can tell, is suffering from bad IR bloat.

upbeat lynx Jul 14, 2023, 7:04 PM

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Can IR bloat really be this extreme? Ive shot unfiltered with this camera before and it didnt look bad at all.

mossy thunder Jul 14, 2023, 7:08 PM

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With the Roki at f2.8?

upbeat lynx Jul 14, 2023, 7:09 PM

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Yeah

mossy thunder Jul 14, 2023, 7:26 PM

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upbeat lynx Can IR bloat really be this extreme? Ive shot unfiltered with this camera before...

Do you have any examples of images taken earlier?

full field Jul 14, 2023, 7:27 PM

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Off Topic: I love that pfp @mossy thunder 😂

mossy thunder Jul 14, 2023, 7:28 PM

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Lol, thanks, I had that pic lying around on my cam roll and decided to see how it looked.

upbeat lynx Jul 14, 2023, 7:31 PM

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mossy thunder Do you have any examples of images taken earlier?

I had some exposures on Anatres unfiltered I was going to show you but I cant seem to find them.

mossy thunder Jul 14, 2023, 7:32 PM

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It also may not show up on single subs, due to IR being faint.

upbeat lynx Jul 14, 2023, 7:36 PM

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The l-enhance lets IR let through so that should have made my NA neb picture less sharp, right?

mossy thunder Jul 14, 2023, 7:41 PM

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No it reduces abberations, along with UV and IR light due to it's tight bandpasses

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So you get less and smaller stars in images.

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Considering your stopped down on the Roki, means the CA wouldn't be that bad on the Lagoon image.

#Could someone explain the blur in the image?