Strange Streaks In ...
 
Share:
Notifications
Clear all

2023-03-15: APP 2.0.0-beta14 has been released !

IMPROVED FRAME LIST, sorting on column header click and you can move the columns now which will be preserved between restarts.

 

We are very close now to  releasing APP 2.0.0 stable with a complete printable manual...

 

Astro Pixel Processor Windows 64-bit

Astro Pixel Processor macOS Intel 64-bit

Astro Pixel Processor macOS Apple M Silicon 64-bit

Astro Pixel Processor Linux DEB 64-bit

Astro Pixel Processor Linux RPM 64-bit

Strange Streaks In Image

5 Posts
3 Users
0 Likes
513 Views
(@greenj23)
Molecular Cloud
Joined: 2 years ago
Posts: 2
Topic starter  

Forgive the dumb question as I'm just starting out. Any idea what these streaks might be?

 

Using:

WO Z61

ASI294MC Pro

EQ6-r Mount

Optolong L-Pro filter

ASI 120mm Mini Guide cam

Streaks

 


   
ReplyQuote
(@wvreeven)
Quasar
Joined: 5 years ago
Posts: 2102
 

@greenj23 It is hard to say without more information but it looks like walking noise to me. Did you drizzle in between exposures?

Walking noise arises when there is a slight shift of the FOV in between exposures such that instrument noise gets slowly shifted with respect to the target. It is hard to impossible to remove during processing and post-processing. The only remedy against it is to sufficiently drizzle in between images so the noise gets spread in a random and large enough way so it can be processed out.


   
ReplyQuote
(@greenj23)
Molecular Cloud
Joined: 2 years ago
Posts: 2
Topic starter  

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.


   
ReplyQuote
(@astrogee)
Neutron Star
Joined: 5 years ago
Posts: 135
 
Posted by: @greenj23

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.

I think Wouter meant to say dither rather than drizzle - you need to dither to drizzle however. Anyway, the walking noise is due to good guiding while having flex between the guide scope and main scope. I've heard that very good calibration can get rid of it but I haven't seen that in practice. Dither is the way to go. "Dither or die" they say.


   
ReplyQuote
(@wvreeven)
Quasar
Joined: 5 years ago
Posts: 2102
 
Posted by: @astrogee
Posted by: @greenj23

@wvreeven Thanks! I'm using the AsiaIR Pro to capture. I don't it has a drizzle option and this is the first time ive seen this issue. I used DSS to stack. I guess i'll see if this issue happens again next time I get a clear night.

I think Wouter meant to say dither rather than drizzle - you need to dither to drizzle however. Anyway, the walking noise is due to good guiding while having flex between the guide scope and main scope. I've heard that very good calibration can get rid of it but I haven't seen that in practice. Dither is the way to go. "Dither or die" they say.

Oops, yes I meant dither instead of drizzle. Thanks for the correction!


   
ReplyQuote
Share: