I have been shooting Ha with a Quark Chromosphere for a few months now and it looks like my quark is providing good contrast and uniformity, but I can't stop noticing how all the details lack of smoothness when I zoom in.
It's almost like an irregular but low spatial frequency pattern is overlaid on the chromosphere structures
Some examples below:
I see images form other Quark users with similar setup/cameras and structures have a very smooth "silk-like" aspect.
Any ideas what could cause this effect?
- Camera noise? I would exclude I am using the Max at HCG and RN should be limited
- Photosphere granulation leakage ?
- Deteriorated Quark blocking filter?
My setup: Quark Chromosphere, Bresser acro 127/1200, Astronomik L3 Uv/IR cut, Apollo M-Max. Frames are flat calibrated.
Thanks
Help me diagnose if I have a problem with my Quark
- marktownley
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Re: Help me diagnose if I have a problem with my Quark
Are those unprocessed images?
http://brierleyhillsolar.blogspot.co.uk/
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Re: Help me diagnose if I have a problem with my Quark
Here the unprocessed stacks:
https://drive.google.com/drive/folders/ ... sp=sharing
https://drive.google.com/drive/folders/ ... sp=sharing
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Re: Help me diagnose if I have a problem with my Quark
Thanks!
I don't think you have a problem with that Quark at all. I think you have a very nice one. I think your image is ever so slightly in the blue side of the Ha centreline, but that is easily fixed.
The pattern you are seeing is the chromosphere overlain over the granulation of the photosphere, this is because your Quark has a wider bandpass. This isn't a bad thing and the Quark is in spec, indeed, it is a very even fov, which is rare for a Quark!
Here is my processed version of the raw data...
I don't think you have a problem with that Quark at all. I think you have a very nice one. I think your image is ever so slightly in the blue side of the Ha centreline, but that is easily fixed.
The pattern you are seeing is the chromosphere overlain over the granulation of the photosphere, this is because your Quark has a wider bandpass. This isn't a bad thing and the Quark is in spec, indeed, it is a very even fov, which is rare for a Quark!
Here is my processed version of the raw data...
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
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- Oh, I get it now!
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Re: Help me diagnose if I have a problem with my Quark
Thank you, so indeed it’s a photosphere leakage. How is that not a bad thing?
How do I fix the blue shift? I have the quark set to -4 CCW as that one appeared to be the best in band position to my eyes
The quark is decently uniform but the stacks have been calibrated with flats, that’s why they are so even
Here how the flat looks like
Thanks!
How do I fix the blue shift? I have the quark set to -4 CCW as that one appeared to be the best in band position to my eyes
The quark is decently uniform but the stacks have been calibrated with flats, that’s why they are so even
Here how the flat looks like
Thanks!
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Re: Help me diagnose if I have a problem with my Quark
That's a very good flat, you do have a very good quark, not all are like this!
My advice would be to take images of same mid disk feature, no flats with a click either side of and including the current click position, and without processing look which is the darkest and most even in terms of illumination.
BTW, interesting to see the results from this setup. I have the same scope and a Quark and have been wondering what the Apollo Max would be like with it, I use an IMX174 chipped camera.
Mark
My advice would be to take images of same mid disk feature, no flats with a click either side of and including the current click position, and without processing look which is the darkest and most even in terms of illumination.
BTW, interesting to see the results from this setup. I have the same scope and a Quark and have been wondering what the Apollo Max would be like with it, I use an IMX174 chipped camera.
Mark
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
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Re: Help me diagnose if I have a problem with my Quark
Hi! here three unprocessed stacks at different tuning positions:3CCW, 4CCW and 5CCW. TIFF can be downloaded from here:https://drive.google.com/drive/folders/ ... sp=sharing
3CCW
4CCW
5CCW
3CCW is definitely the less uniform.
5CCW appears more uniform but to my eyes maybe also a bit softer in the details compared to 4CCW
3CCW
4CCW
5CCW
3CCW is definitely the less uniform.
5CCW appears more uniform but to my eyes maybe also a bit softer in the details compared to 4CCW
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Re: Help me diagnose if I have a problem with my Quark
4ccw looks like the best to me. Maybe you can also try to rotate the camera relative to the Quark by 90° to see if you get even better results with the 4ccw setting.
Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x