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ZWO ASIAIR PRO DITHERING SETTING HELP

CCD CMOS Equipment
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#1 Midnit369

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Posted 08 May 2021 - 06:15 PM

I have the ASIAIR PRO and was looking into dithering settings and wondering how to improve them. 

EQUIPMENT 

 

NEXSTAR 6SE

Aperture 150mm F/10

FL 1500mm

 

MAIN CAMERA

ZWO ASI533MC PRO

Pixel Size 3.76

Pixel Array/Resolution 3008 x 3008

Chip/Sensor Size 1" x 1" (11.31mm x 11.31mm)

Bin 1

Image Scale .82 arcsecs w/ focal reducer F/6.3

 

ZWO MINI GUIDE SCOPE 

Aperture 1.18" (30mm) F/4

FL 120mm

 

GUIDE CAMERA

ZWO ASI120MM MINI

Pixel Size 3.75

Pixel Array/Resolution 1280 x 960

Chip/Sensor Size 1/3" x 1/3" (4.8mm x 3.6mm)

Bin 1

Image Scale 6.44 arcsecs

 

I used a program called New Astronomy CCD Calculator to give me the Image Scale

 

https://new-astronom...former.com/1.5/

 

Then I used the math in 

 

https://www.myastros...culatedithering

 

So it said to divide Guider Scale/Imager Scale to give me Dither Scale.

 

6.44/.82=7.85

 

Dither Level   |   Pixels

---------------       ---------

1       -             +/-  0.5  x  Dither Scale  

2       -             +/-  1.0  x  Dither Scale

3       -             +/-  2.0  x  Dither Scale 

4       -             +/-  3.0  x  Dither Scale

5       -             +/-  5.0  x  Dither Scale

 

3.0*7.85=23.55 Pixels

 

So my Dether Level be 4

 

​Can someone verify my calculation. 

 

I want to set my settings up in ASIAIR PRO and get the best out it.

 

 p3949496545-5.jpg

 



#2 ian408

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Posted 08 May 2021 - 06:34 PM

Try this tute. https://www.youtube....h?v=Ae4iGj1GcB0


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#3 ian408

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Posted 08 May 2021 - 07:26 PM

By the way, I should mention, it sounded like the dithering settings are really dependent on how much noise is present in the image already and what focal range you're using.  The pixel count probably shouldn't be 1-the idea is to move the scope enough to find the noise. The tutorial suggests 3 pixels.  Dither might be anywhere between 3 and 5. Again, depending on the noise. 


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#4 Midnit369

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Posted 08 May 2021 - 07:37 PM

Thank you



#5 ian408

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Posted 08 May 2021 - 07:40 PM

Thank you

You're welcome! I'm just waiting for mine to show up so have been trying to learn how it works :D


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#6 Midnit369

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Posted 08 May 2021 - 07:41 PM

By any chance do you what could effect my stacking all my images are great but as soon as it start doing a live stacking. I will so many images get ignored. How can I improve my settings for live stacking to get 90% to 100% stack instead of rejection.



#7 Midnit369

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Posted 08 May 2021 - 07:44 PM

Your going to love it I have had issues with Polar Alignment and getting longer exposures for galaxies and nebulas now i have no issues but I like to try live stacking so i can see the difference in me using PixInsight or ASIAIR Pro stacking.


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#8 ian408

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Posted 08 May 2021 - 10:25 PM

Stacking might have a high rejection rate for a lot of reasons. Streaks are just one reason you might reject a frame.  

 

I don't know how stacking works in AIRPRO. I mean, I understand the concept, just not how it works.




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