Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
- arnedanielsen
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Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Dear friends,
Here are some FD images from July 13th.
First a FD image in H-Alpha using the Takahashi Sky-90II with Coronado 90mm/BF15, Coronado 2x CeMax and ASI 1600mm PRO. Sun FD in H-Alpha 13th of July 2021
For CaK imaging I've been using the ASI ZWO 178mm for a while now. This has produced nice, but undersampled, FD images at the native focal length of 360mm with the William Optics ZenithStar 61II stopped down to 46mm aperture. Using a 2 or 2,5x barlow to increase the focal length to 720-900mm gave a properly sampled image and much better results, but then of course I didn't get FD.
Wanting to get the best from both worlds I decided to buy an ASI ZWO 183mm. This camera has the same pixel size as the 178mm, but much bigger sensor allowing for FD images up till around 920-950mm.
For comparison I started out shooting using the William Optics ZenithStar 61II stopped down to 46mm at it's native focal length of 360mm. Sun FD in CaK 13th of July 2021
Sun FD in CaK 13th of July 2021 - colorized
I then added a Coronado Cemax 2x to the imaging train. This turns out to multiply the focal length by 2,5 in this configuration and thus the focal length ends up at ~900mm. This is at the high end of the optimal sampling range for this aperture/wavelength and just fits the Sun within the field of view. Sun FD in CaK 13th of July 2021
Sun FD in CaK 13th of July 2021 - colorized
Make sure to click on links for full size images.
It's so much fun to getting a properly sampled FD image like this without having to deal with mosaics.
Thanks for looking!
Arne
Here are some FD images from July 13th.
First a FD image in H-Alpha using the Takahashi Sky-90II with Coronado 90mm/BF15, Coronado 2x CeMax and ASI 1600mm PRO. Sun FD in H-Alpha 13th of July 2021
For CaK imaging I've been using the ASI ZWO 178mm for a while now. This has produced nice, but undersampled, FD images at the native focal length of 360mm with the William Optics ZenithStar 61II stopped down to 46mm aperture. Using a 2 or 2,5x barlow to increase the focal length to 720-900mm gave a properly sampled image and much better results, but then of course I didn't get FD.
Wanting to get the best from both worlds I decided to buy an ASI ZWO 183mm. This camera has the same pixel size as the 178mm, but much bigger sensor allowing for FD images up till around 920-950mm.
For comparison I started out shooting using the William Optics ZenithStar 61II stopped down to 46mm at it's native focal length of 360mm. Sun FD in CaK 13th of July 2021
Sun FD in CaK 13th of July 2021 - colorized
I then added a Coronado Cemax 2x to the imaging train. This turns out to multiply the focal length by 2,5 in this configuration and thus the focal length ends up at ~900mm. This is at the high end of the optimal sampling range for this aperture/wavelength and just fits the Sun within the field of view. Sun FD in CaK 13th of July 2021
Sun FD in CaK 13th of July 2021 - colorized
Make sure to click on links for full size images.
It's so much fun to getting a properly sampled FD image like this without having to deal with mosaics.
Thanks for looking!
Arne
- Petrus
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Looking good as usual, Arne! Great CaK shots.
~ Petrus ~
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Interesting description and wonderful photos, I learned a lot, thank you very much, Arne!
Ivan
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Arne, could you take a photo of the Takahashi Sky-90II with Coronado 90mm so that you can understand how the DS is attached to the telescope, perhaps you still have a drawing of the adapter? A friend of mine is now thinking about how best to connect Sky-90 and DS Coronado90. Thank you.
Ivan
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Good images, Arne.
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: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Beautiful images Arne.
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Oooh that last CaK is an absolute cracker just need to get rid of the dust bunny
Alexandra
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Very good indeed Arne! You could unscrew the lens off the Cemax barlow and screw it direct onto the camera nosepiece which would drop the magnification factor a bit, this is what I do...
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: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Thank you very much for your kind comments Petrus, Ivan, Stu, Maurits, Alexandra and Mark!
Ivan: The front filter is the tilt-tuning version that came with the first version of the SolarMax 90. I ordered a custom adapter from ww.PreciseParts.com to fit the dewshield of the Sky-90II. It costed around $250 and was called:
Custom adapter, Coronado SolarMax 90 Solar Filter to Tak Sky 90 Dew Shield, L=10.8 mm
Alexandra: Will do :-) I unfortunately didn't have time for flats on this session, but have done so for later sessions.
Mark: Thanks for the tip. I will certainly try that. I wouldn't mind slightly more air around the solar disc.
Best regards,
Arne
Ivan: The front filter is the tilt-tuning version that came with the first version of the SolarMax 90. I ordered a custom adapter from ww.PreciseParts.com to fit the dewshield of the Sky-90II. It costed around $250 and was called:
Custom adapter, Coronado SolarMax 90 Solar Filter to Tak Sky 90 Dew Shield, L=10.8 mm
Alexandra: Will do :-) I unfortunately didn't have time for flats on this session, but have done so for later sessions.
Mark: Thanks for the tip. I will certainly try that. I wouldn't mind slightly more air around the solar disc.
Best regards,
Arne
- arnedanielsen
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Ivan,Ivan wrote: ↑Fri Jul 23, 2021 9:38 pm Arne, could you take a photo of the Takahashi Sky-90II with Coronado 90mm so that you can understand how the DS is attached to the telescope, perhaps you still have a drawing of the adapter? A friend of mine is now thinking about how best to connect Sky-90 and DS Coronado90. Thank you.
Ivan
Here's an image of the filter attached to the dewshield... Best regards,
Arne
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Re: Sun FD in H-Alpha and CaK 13th of July 2021 - CaK images with new camera (ZWO ASI 183mm)
Thanks a lot, Arne.
Ivan
Ivan