overview for bistdunarrisch

Heart and Soul nebula in c/[email protected]

[–] [email protected] 1 points 1 week ago

Thank you for your nice comment!

M42 (Orion Nebula) in c/[email protected]

[–] [email protected] 2 points 2 weeks ago (1 children)

The stripes are called walking noise/ pattern and often show up when not using a tracking mount and not using dithering.

Because not every pixel of your camera captures signal exactly equally bright you‘ll see this difference along the movement of the sky as it gets accumulated with every subframe. The only way to get rid of it is to vary the pixels for each part of the image after each exposure. This can be done by moving the camera slightly after each shot. This process is called dithering.

With good calibration frames the pattern can by minimized very slightly. Other than that the only real option for processing I can think of is to hide the pattern by not stretching the dark ares too much.

Other than that great image!

Heart and Soul nebula in c/[email protected]

[–] [email protected] 3 points 1 month ago

I didn't check but would guess right about one hour. Plus ~30min registration. Normally I just start the process and leave my laptop and come back later, so I don't know for sure.

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Heart and Soul nebula (lemmy.world)

submitted 1 month ago by [email protected] to c/[email protected]

4 comments fedilink

On our journey to shot the best images we can with our non ideal setup we collected more data on the heart nebula. Main problem with our setup is the distance of the sensor which is not perfect and results in bad star shapes in the corners. Stepping down to 2.8 and using BXT helps a lot. Combined with old data we gathered a total exposure time of 14 hours.

Samyang 135mm @f2.8 and f2.0
Fuji X-T5 (unmodified)
STC dual narrowband filter
Star Adventurer 2i
856 x 60s
ISO 3200

Editing:

stacked, remove green noise, BGE in Siril
BXT, SXT in Pixinsight
streched with GHS in Siril
NXT, colouring, contrast, recombining stars in PS

Full resolution: https://telescopius.com/pictures/view/211833/deep_sky/ic-1824/heart-and-soul-nebula/by-maxi_franzi

Sh2-132 - The Lion Nebula in c/[email protected]

[–] [email protected] 2 points 2 months ago

Absolutely stunning image! Thanks for sharing

124

[OC] deer in german woods (lemmy.world)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

4 comments fedilink

Shoot with a Samyang 135mm lens and a Fuji X-T5.

NGC 7293 - Helix Nebula in c/[email protected]

[–] [email protected] 3 points 3 months ago

Also we were quite surprised how bright the nebula is. We didn't thought to get that much signal with 15min exposure time. Even more so as our camera is not infrared modified.

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NGC 7293 - Helix Nebula (lemmy.world)

submitted 3 months ago by [email protected] to c/[email protected]

1 comments fedilink

This is a first test to shoot NGC 7293 with a 135mm lens. Sadly we could only gather 15 min exposure time as the time frame for shooting this nebula is super short and we had a lot of clouds. Hopefully we have better conditions next year. But this test makes us hopeful to get a decent image with our equipment.

Samyang 135mm
Fuji X-T5
dual narrowband filter
Star Adventurer 2i
29 * 30s
stacked in Siril
BXT, NXT, SXT
final editing in PS

42

C/2023 A3 (Tsuchinshan-ATLAS) (lemmy.world)

submitted 3 months ago by [email protected] to c/[email protected]

0 comments fedilink

Got another shot at C/2023 A3.

Samyang 135mm f2.0
Fuji X-T5
603 x 5s
ISO 400
Stacked, streched in Siril
combined stars, comet and foreground in Photoshop

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 1 points 3 months ago* (last edited 3 months ago) (1 children)

Ah ok, so I assumed you registered all your light frames onto your stars as your stars look very sharp. And that’s the normal way for every astro image you would normally do. A comet however moves so fast that its position changes even in the short time frame were you took the images.

So after registering all the images with the stars pattern you want to make a second registration were you mark the position of the comet on the first frame and on the last frame. With that now all images are aligned onto the comet and now the stars appear to move in the background. As your stars look so sharp I assumed you didn’t make the second registration. In DSS there is a comet mode for that but I haven’t worked with that so I can’t tell you about the workflow with that program.

Hope that helped in any way!

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 1 points 4 months ago (3 children)

I do not have much experience with DSS, as far as I know the result should be very similar. „Lights“ is the term for a single exposure. The technique is basically the same no matter which software you use.

But if you have Siril specific questions feel free to drop any questions :)

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 1 points 4 months ago (5 children)

It‘s hard to tell from your image, bit it appears you can even get a bit more details if you register your lights onto the comet itself and then stack all the images. I used Siril for the two step registration process.

But nice image nonetheless!

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 1 points 4 months ago

Cool thank you!

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 2 points 4 months ago

Lets see what the next days will bring. As the comet rises higher maybe it will be even more visible.

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 2 points 4 months ago

Your image looks not to bad either. On my phone the comet looked the same like yours.

C/2023 A3 & M5 in c/[email protected]

[–] [email protected] 1 points 4 months ago* (last edited 4 months ago)

Thanks for answering! Yes the comet moved quite a bit, but I stacked two images. One for the stars and one for the comet were I registered the images onto the comet itself. So the stream seems to be a real feature of the comet.

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C/2023 A3 & M5 (lemmy.world)

submitted 4 months ago* (last edited 4 months ago) by [email protected] to c/[email protected]

20 comments fedilink

We got extremely lucky and got a tiny window of cloudless sky in an never ending sequence of cloudy nights. Also the conditions were a nightmare with severe light pollution and lights shining directly at our equipment.

Samyang 135mm f2.0
Fuji X-T5
158 x 5s
ISO 125
@f2.8

And maybe somebody here can explain to us what the ionized gas is that 'shoots out‘ in front of the comet?

Also do the colours seem to be correct? We tried our best at background extraction and maintaining the true colour, but the raw data was of poor quality. From images of other comets the dust tails normally seems to have a yellow/orange colour and only the plasma tail is blue.

Edit: found the answer to the Anti-tail. It shows the trail of dust were the comet has traveled, which appears to come out at the opposing side because of earths angle relative to the comet and sun.