Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
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Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Dear All,
Here are some new test images comparing various configurations.
Comparison between F/27 (left image) and F/35 (right image)with the C8 Edge-HD. The F/35 image has been resized to have the same sampling as the F/27 image. Both images are then processed exactly in the same way. Seeing is similar for both images.
The increase in contrast appears significant. As a reminder, a 0.3 FWHM filter has an effective FWHM of 0.5 at F/27 and 0.4A at F/35 :
Full image with the C8 Edge-HD at F/27 :
Full image with the C8 Edge-HD at F/35 :
The increase of resolution between F/35 and F/27 is not negligible.
Now the image taken with the C11 Edge-HD (HAT) at F/27 :
This time the incease in resolution is significant.
Best regards
Christian Viladrich
Here are some new test images comparing various configurations.
Comparison between F/27 (left image) and F/35 (right image)with the C8 Edge-HD. The F/35 image has been resized to have the same sampling as the F/27 image. Both images are then processed exactly in the same way. Seeing is similar for both images.
The increase in contrast appears significant. As a reminder, a 0.3 FWHM filter has an effective FWHM of 0.5 at F/27 and 0.4A at F/35 :
Full image with the C8 Edge-HD at F/27 :
Full image with the C8 Edge-HD at F/35 :
The increase of resolution between F/35 and F/27 is not negligible.
Now the image taken with the C11 Edge-HD (HAT) at F/27 :
This time the incease in resolution is significant.
Best regards
Christian Viladrich
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
That is a great comparison, Christian ! Is it just the contrast ? Detail in the f/35 seems better... or maybe that is just my impression.
All impressive images anyway....
Franco
All impressive images anyway....
Franco
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Hi Christian:
Superb images.
What f /ratio do you recommend me for a setup that I will start to try as soon as the weather lets me.
It is a 10" f/20 TEC Maksutov with a full aperture Aries D-ERF, an ATM 0.45Aº Daystar H alpha filter.
I was planning to try it at f/20 or at f/40 with a Baader 2X Telecentric.
¿What do you suggest ?
Best regards,
Eric.
Superb images.
What f /ratio do you recommend me for a setup that I will start to try as soon as the weather lets me.
It is a 10" f/20 TEC Maksutov with a full aperture Aries D-ERF, an ATM 0.45Aº Daystar H alpha filter.
I was planning to try it at f/20 or at f/40 with a Baader 2X Telecentric.
¿What do you suggest ?
Best regards,
Eric.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Hi Christian,
Very nice and useful comparision work! Very informative for users.
The only questions remain:
can we achieve about the same contrast at F/27 as at F/35 by postprocessing contrast addition?
what will be the final resolution F/27 vs F/35 if the camera has enough sampling at F/27.
For me the F/27 is not necessary worser than the F/35. F/27 allows wider FOV and significantly shorter exposure and, possibly shorter movie cadence. Of course, I prefer to have slower F/D at the etalon and then use a focal reducer if a smaller image scale required.
Thanks for your comparative work.
Valery
Very nice and useful comparision work! Very informative for users.
The only questions remain:
can we achieve about the same contrast at F/27 as at F/35 by postprocessing contrast addition?
what will be the final resolution F/27 vs F/35 if the camera has enough sampling at F/27.
For me the F/27 is not necessary worser than the F/35. F/27 allows wider FOV and significantly shorter exposure and, possibly shorter movie cadence. Of course, I prefer to have slower F/D at the etalon and then use a focal reducer if a smaller image scale required.
Thanks for your comparative work.
Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
All stunning images, Christian. We're into 6sigma comparison territory here, I think. They are all superb examples of hi-res solar imaging that most of us would be absolutely delighted with.
Stu.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Christian, not only are your postings brilliant but educational.
I have put the C11 image on my desktop as a wallpaper for inspiration ( and as a processing template ).
One day ....
Best wishes,
David
I have put the C11 image on my desktop as a wallpaper for inspiration ( and as a processing template ).
One day ....
Best wishes,
David
Making the possible difficult and the difficult impossible.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Wow! both versions I would be ecstatic with
Alexandra
Alexandra
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
It seems aperture rules.Thank you for the comparisons.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Good old rule.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
outstanding images Christian
Pedro Re'
https://pedroreastrophotography.com/
https://pedroreastrophotography.com/
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
At the expense of image noise maybe?
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: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Thanks to all :-)
France : indeed, the resolution of the image at F/35 is larger (even if I rescaled it to the same sampling for the comparison). This could increase the contrast of smaller details. Still the contract of larger details (the filaments) is only affected by the effective bandpass of the filter.
Eric : I would say go for F/30, still you would need to find a X1.5 telecentric. So maybe, F/40 with the X2 telecentric and a X0.7 focal reducer ?
Valary : this is an interesting question ;-) It is all about S/N. The more contrast you have at the acquisition, the softer you can process the image. Still, this is a matter of finding the correct balance between exposure time (which increases with F/D), seeing and contrast.
France : indeed, the resolution of the image at F/35 is larger (even if I rescaled it to the same sampling for the comparison). This could increase the contrast of smaller details. Still the contract of larger details (the filaments) is only affected by the effective bandpass of the filter.
Eric : I would say go for F/30, still you would need to find a X1.5 telecentric. So maybe, F/40 with the X2 telecentric and a X0.7 focal reducer ?
Valary : this is an interesting question ;-) It is all about S/N. The more contrast you have at the acquisition, the softer you can process the image. Still, this is a matter of finding the correct balance between exposure time (which increases with F/D), seeing and contrast.
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Hi Christian,
I agree with David that your postings helped me to learn. Thanks.
Alfred
I agree with David that your postings helped me to learn. Thanks.
Alfred
- michael.h.f.wilkinson
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Absolutely stunning images. The slower F-ratio definitely has the edge
Solar kit: GP-C8 with Thousand Oaks Solar filter, APM 80mm F/6, Lunt Herschel Wedge, Solar Spectrum 0.3Å H-alpha filter, Beloptic Tri-Band ERF (80mm free aperture), Thousand Oaks 90mm ERF, Coronado SolarMax II 60mm with Double Stack Unit. Lunt straight B1800 Ca-K module.
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Very very true!christian viladrich wrote: ↑Sun Aug 06, 2017 9:21 am It is all about S/N. The more contrast you have at the acquisition, the softer you can process the image. Still, this is a matter of finding the correct balance between exposure time (which increases with F/D), seeing and contrast.
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: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Alfred, David : it is my pleasure if it can be of any help :-)
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Hi Christian. Are you using the RG32 or RG46 solar spectrum filter?
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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: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Hi Mark, this is the RG32.
Still need some time to finelly tune it right on on Ha.
Still need some time to finelly tune it right on on Ha.
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
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Re: Various test images with Solar Spectrum RG 0.3A, C8 Edge HD at F/27 and F/35, and C11 at F/27
Must confess it's a filter i'm very seriously thinking about getting myself...christian viladrich wrote: ↑Thu Aug 10, 2017 6:48 pm Hi Mark, this is the RG32.
Still need some time to finelly tune it right on on Ha.
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!