Hello Ladies and gentlemen,
how do you judge the focus on all over the disc?
https://drive.google.com/file/d/1Sj2_W4 ... sp=sharing
I used the tilter for the first time to avoid Newton's rings and it seems, somewhere on the disc, the focus lacks of precision.
What do you think about?
Focus over Sun disc - Help to solve Newton's Rings
- davidem27
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Focus over Sun disc - Help to solve Newton's Rings
Last edited by davidem27 on Sat Jul 03, 2021 8:09 am, edited 1 time in total.
White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
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Re: Focus over Sun disc
I would have thought that the Sun would have the same focus all over, I've never had a problem with this. However if you are using massive tilt this could be a problem. Certainly the left side looks more out of focus than the right so something is not square
A nice disc though
Alexandra
A nice disc though
Alexandra
- davidem27
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Re: Focus over Sun disc
Thankyou Alexandra for replying.
Your look puts one heavy cent to my doubts.
The entity of the tilting is definitely thick.
But this was the first position I figured out that removed Newton's ring.
Maybe I have to try again with another angle.
But, sincerely, I don't think it will work.
Do you have any other tip to remove Newton's rings?
Your look puts one heavy cent to my doubts.
The entity of the tilting is definitely thick.
But this was the first position I figured out that removed Newton's ring.
Maybe I have to try again with another angle.
But, sincerely, I don't think it will work.
Do you have any other tip to remove Newton's rings?
White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200
www.volpetta.com
We are curious. We need equipment, we need seeing, we need time
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200
www.volpetta.com
We are curious. We need equipment, we need seeing, we need time
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Re: Focus over Sun disc - Help to solve Newton's Rings
Hi Davide!
I was also fighting against the N.R. the previous days, because they appeared with my new Barlow. I thought that because it is a considered quality one would not present N.R.s. I found relatively easy (although tiring...) to remove them with some flats in firecapture, but I never had them in full disks, so there it might be more difficult? Did you try?
Best wishes,
Alexandros
I was also fighting against the N.R. the previous days, because they appeared with my new Barlow. I thought that because it is a considered quality one would not present N.R.s. I found relatively easy (although tiring...) to remove them with some flats in firecapture, but I never had them in full disks, so there it might be more difficult? Did you try?
Best wishes,
Alexandros
Alexandros
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Greece
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ZWO ASI290MM, ZWO ASI1600MM Pro,
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Re: Focus over Sun disc - Help to solve Newton's Rings
Hello Alexandros and hello to everyone,
I was away in last weeks so didn't check forums.
I do not know what is the better way to apply flat images to Sun disc images.
I have to find out what are the most common and useful ways.
I saw some youtube videos from a solarchat user but I have to better understand/apply the software process.
How did you tried?
Do anyone else know how to effectively remove Newton's rings from full disk images?
Thanks so much and glad to be here again.
White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200
www.volpetta.com
We are curious. We need equipment, we need seeing, we need time
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200
www.volpetta.com
We are curious. We need equipment, we need seeing, we need time
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Re: Focus over Sun disc - Help to solve Newton's Rings
David,
I had a thread on the subject of full disk flats and NR.
viewtopic.php?f=33&t=31335
FireCapture flats worked well, but for ease of use I’ve gone back to using the T2 tilter at maximum angle.
This is with the TV x2.5 PM and the ASI1600.
I had a thread on the subject of full disk flats and NR.
viewtopic.php?f=33&t=31335
FireCapture flats worked well, but for ease of use I’ve gone back to using the T2 tilter at maximum angle.
This is with the TV x2.5 PM and the ASI1600.
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Re: Focus over Sun disc - Help to solve Newton's Rings
David, I need always a tilter when I do Ha imaging.