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Deep sky stacker Only one frame will be stacked

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paul16mj

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Minor Planet

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Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sun May 06, 2018 2:24 am

Deep sky stacker Only one frame will be stacked

I tried to photograph m106, and stack 30 light frames into deepskystacker.

But somehow it still runs off when i use 30 second exposures with minimum star trails.

Can i fix this somehow?
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
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h2opolo

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Black Hole

Posts: 1233

Joined: Mon Dec 19, 2016 5:47 pm

Location: Louisiana

Post Sun May 06, 2018 9:41 am

Re: Deep sky stacker Only one frame will be stacked

I'm not totally sure of what it is that you are describing. Can you provide some better detail? Do you have access to Pixinsight or are you only using DSS? Give me some better detail of what is going on and I will do anything I can to help you out.

Sean
ES ED-102, Carbon 127, GSO RC-8, Celestron C-11,
ATIK 460 EX Mono, ZWO ASI 1600 MM cool
NEQ6, ST80, Lodestar X2,
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com
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paul16mj

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Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sun May 06, 2018 1:44 pm

Re: Deep sky stacker Only one frame will be stacked

Okay, so i took 30 light frames of messier 106,
I took 5 dark frames with the same settings but with the lens cap on the scope.
And 5 bias frames with the fastest shutter speed the camera could handle (450d)

When i import into DSS and start registering the images. The star detection threshold is at 3 percent, and it will detect around 170~ stars.

This somehow is still not enough and the software just cant do it.

There are some star trails at the edges of the image, but not at the center. I find this so strange. Could it be because the telescope has a built-in barlow lens?

Also my camera fell out 2 days ago but it seems to be working fine, as the problem occured before this.
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
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paul16mj

User avatar

Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sun May 06, 2018 4:03 pm

Re: Deep sky stacker Only one frame will be stacked

Ive got the scope out now, somewhat polar aligned.
But even in the eye piece. stars that are off to the side appear a but elongated.

Im prety sure this is because of that dammn built in barlow...

Any way to avoid this?
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
<<

h2opolo

User avatar

Black Hole

Posts: 1233

Joined: Mon Dec 19, 2016 5:47 pm

Location: Louisiana

Post Sun May 06, 2018 4:09 pm

Re: Deep sky stacker Only one frame will be stacked

I gotta tell ya it's been so long since I used DSS that I'm having to really think about what your writing. I get that the threshold is low because the exposures were only 30 seconds. Did you look at Dougs video on DSS? If memory serves it Sigma Clip that you want to use. As far as star trailing around the edges are you saying that the final shot that comes out of DSS has star trails on it?

Without guiding your mount you are playing with fire with regards to star trails. Even a perfect polar alignment is not going to help you much. Depending on what part of the sky you are shooting is going to more or less be more forgiving than not. If you are shooting to the North then the rotation of the Earth is not so dramatic but if you are shooting to the East or West you are going to see some rotation without some sort of tracking system in play.

Does your mount support a guide port?
ES ED-102, Carbon 127, GSO RC-8, Celestron C-11,
ATIK 460 EX Mono, ZWO ASI 1600 MM cool
NEQ6, ST80, Lodestar X2,
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com
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paul16mj

User avatar

Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sun May 06, 2018 5:32 pm

Re: Deep sky stacker Only one frame will be stacked

I am taking short enough exposures for star trails not to appear.

But my scope has a built in barlow lens, that somehow bends the light. So the raw images from the camera have good stars in the middle of the image, and to the sides it has these elongated stars.
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
<<

h2opolo

User avatar

Black Hole

Posts: 1233

Joined: Mon Dec 19, 2016 5:47 pm

Location: Louisiana

Post Sun May 06, 2018 6:15 pm

Re: Deep sky stacker Only one frame will be stacked

Oh okay, that sounds like coma. can you post a picture ? You may need to add a flattener to the back end to stop that from happening. What scope and camera are you using?
ES ED-102, Carbon 127, GSO RC-8, Celestron C-11,
ATIK 460 EX Mono, ZWO ASI 1600 MM cool
NEQ6, ST80, Lodestar X2,
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com
<<

paul16mj

User avatar

Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sun May 06, 2018 6:18 pm

Re: Deep sky stacker Only one frame will be stacked

The scope is a 150/1400 bresser pollux. And the camera is a canon 450d EOS

I will get a new scope however in 2 months

this scope is not made for astrophotography but i wanted to try it to see how it would end up.

Tonight i shot 20 images with 80 seconds of exposure, DSS seems to stack them fine. I tried it with 5 and it worked.

I guess its because i photographed a star cluster called m13. It has a lot of stars to align on
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
<<

h2opolo

User avatar

Black Hole

Posts: 1233

Joined: Mon Dec 19, 2016 5:47 pm

Location: Louisiana

Post Sun May 06, 2018 9:45 pm

Re: Deep sky stacker Only one frame will be stacked

That maybe it but just stay in touch as you go along. I'll be happy to lend you a hand as you get started. It was a struggle for me at first and I felt silly asking so many questions from people that were producing such beautiful shots, but they always helped me out. Go back a year and look at my questions and you won't feel bad. Just keep trying and ask questions nobody here will steer you wrong. Your in the right place. Just keep trying and bring your troubles to us. We will help you

Sean
ES ED-102, Carbon 127, GSO RC-8, Celestron C-11,
ATIK 460 EX Mono, ZWO ASI 1600 MM cool
NEQ6, ST80, Lodestar X2,
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com

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