FDs & G-Band images (New G-Band Animation added)
- yltansg
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FDs & G-Band images (New G-Band Animation added)
Hi everyone,
Greetings from Singapore. It has been raining and cloudy for quite a while. I am glad to have 30 minutes this morning with thin layer of clouds over the Sun to get this 3 full disks. Generally a blank disk on WL and some filaments and prominences on HA and interesting areas of magnetic field concentration in the CAK image.
Alfred
Greetings from Singapore. It has been raining and cloudy for quite a while. I am glad to have 30 minutes this morning with thin layer of clouds over the Sun to get this 3 full disks. Generally a blank disk on WL and some filaments and prominences on HA and interesting areas of magnetic field concentration in the CAK image.
Alfred
Last edited by yltansg on Mon Dec 18, 2017 2:09 pm, edited 3 times in total.
- ffellah
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Re: Full disks in 3 wavelengths and scopes used
A beautiful set, Alfred. I am glad you had some sun after a long time.
Franco
Franco
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Re: Full disks in 3 wavelengths and scopes used
Alfred:
Beautiful 3 flavor session.
Best regards,
Eric.
Beautiful 3 flavor session.
Best regards,
Eric.
- MapleRidge
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Re: Full disks in 3 wavelengths and scopes used
Those are very sharp Alfred...well done
Brian
Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
- Carbon60
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Re: Full disks in 3 wavelengths and scopes used
A very fine tryptic, Alfred.
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/
- marktownley
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Re: Full disks in 3 wavelengths and scopes used
Three very nice disks Alfred!
http://brierleyhillsolar.blogspot.co.uk/
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- yltansg
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Re: Full disks in 3 wavelengths and scopes used
Thanks Mark, Stu, Brian, Eric and Franco. Seeing condition continue to be poor today. I took 2 more scopes out of cold storage. These were the images from today's session.
For H-Alpha imaging, a150mm refractor with ARIES D-ERF and Lunt 50.
This was the best of 3 H-Alpha images taken this morning (17 Dec 17)
For G-Band imaging, I used an ARIES C8 ERF with a 430nm filter
It was a struggle to get a decent G-Band image this morning.
This was taken on 1 Nov 17 with the same setup when the seeing was better.
For H-Alpha imaging, a150mm refractor with ARIES D-ERF and Lunt 50.
This was the best of 3 H-Alpha images taken this morning (17 Dec 17)
For G-Band imaging, I used an ARIES C8 ERF with a 430nm filter
It was a struggle to get a decent G-Band image this morning.
This was taken on 1 Nov 17 with the same setup when the seeing was better.
- marktownley
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Re: FDs, G-Band images and Scopes (New images added)
Good additions! Seeing makes all the difference!
http://brierleyhillsolar.blogspot.co.uk/
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Re: FDs, G-Band images and Scopes (New images added)
Thanks Alfred and good to see the comparison in seeing conditions.
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Re: FDs, G-Band images and Scopes (New images added)
A lovely traffic light! and the close ups are fab but the 1st Nov is the business
Alexandra
Alexandra
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Re: FDs, G-Band images and Scopes (New images added)
That granulation is amazing, Alfred. Well done !
Franco
Franco
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Re: FDs & G-Band images (New G-Band animation added)
Thanks Mark, Derek, Alexandra and Franco for your kind comments. Here is a time-lapse gif made from 12 stills taken on 6 Oct 17 from 7:58am to 8:06 am local time.
Enjoy it.
Alfred
Enjoy it.
Alfred
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Re: FDs & G-Band images (New G-Band Animation added)
Great HR (granulation) images there Alfred, well done
Pedro Re'
https://pedroreastrophotography.com/
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- yltansg
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Re: FDs & G-Band images (New G-Band Animation added)
Thanks Pedro. I am able to get reasonable G-Band images with the Edmund Optics 25mm 430/10nm filter when the seeing is average and better. However I have not been able to get a decent image with the Baader Calcium K-Line Filter. I have been trying for some months now Most of the time I used the 430/10nm first and the seeing became poor by the timing I changed over to the K-line filter. Will share findings.
Alfred
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Re: FDs & G-Band images (New G-Band Animation added)
Hello,
The G-band image taken on Nov 1st is pretty good. Well done !
There is no wonder that you get unsatisfactory K line images with the C8. The spherical aberration is so large in near UV that the instrument is no longer diffraction limited.
In the whole, and for diameters larger than around 150 mm, a G-band filter gives images more satisfactory images than a K-line filter:
- the contrast is about the same,
- the sensitivity to turbulence is lower,
- most optics are much better at 430 nm than at 396 nm.
BTW, what is you exposure time with your 430nm FWHM 10 nm filter and the C8 ?
Best regards
Christian
The G-band image taken on Nov 1st is pretty good. Well done !
There is no wonder that you get unsatisfactory K line images with the C8. The spherical aberration is so large in near UV that the instrument is no longer diffraction limited.
In the whole, and for diameters larger than around 150 mm, a G-band filter gives images more satisfactory images than a K-line filter:
- the contrast is about the same,
- the sensitivity to turbulence is lower,
- most optics are much better at 430 nm than at 396 nm.
BTW, what is you exposure time with your 430nm FWHM 10 nm filter and the C8 ?
Best regards
Christian
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/
- yltansg
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Re: FDs & G-Band images (New G-Band Animation added)
Hi Christian,christian viladrich wrote: ↑Mon Dec 25, 2017 4:15 pm
In the whole, and for diameters larger than around 150 mm, a G-band filter gives images more satisfactory images than a K-line filter:
- the contrast is about the same,
- the sensitivity to turbulence is lower,
- most optics are much better at 430 nm than at 396 nm.
BTW, what is you exposure time with your 430nm FWHM 10 nm filter and the C8 ?
Best regards
Christian
Thanks for the valuable information. I am still hoping to catch a nice K-Line image when there is very good seeing
The following are the setting for the 1 Nov G-Band image:
FPS (avg.)=151 Shutter=0.082ms Gain=92 (23%)
Histogramm(min)=84 Histogramm(max)=148 Histogramm=58%
Alfred