2nd Foray into Hi-Res Imaging! (Ca K added.)
- p_zetner
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2nd Foray into Hi-Res Imaging! (Ca K added.)
Greetings Everyone.
I now have my feet wet and understand a little more about approaching high magnifications / resolution.
Here is an image of AR12665 with good seeing and a focal length of ~5600mm. System speed is f/28 which is a little fast for the Daystar giving about 0.7A fwhm bandwidth, according to Christian Vladrich's calculations
http://www.astrosurf.com/viladrich/astr ... lar/FP.htm
and there is, of course, the usual continuum leakage associated with a single stacked filter. I'll address these issues in future imaging but am pretty satisfied with the performance of the system. Camera control used Firecapture and Image stacking used AS2 and a stack of ~400 out of 9000. (Probably a little over the top but no significant degradation in sharpness of the final image and an overall improvment in noise.)
Cheers.
Peter.
I now have my feet wet and understand a little more about approaching high magnifications / resolution.
Here is an image of AR12665 with good seeing and a focal length of ~5600mm. System speed is f/28 which is a little fast for the Daystar giving about 0.7A fwhm bandwidth, according to Christian Vladrich's calculations
http://www.astrosurf.com/viladrich/astr ... lar/FP.htm
and there is, of course, the usual continuum leakage associated with a single stacked filter. I'll address these issues in future imaging but am pretty satisfied with the performance of the system. Camera control used Firecapture and Image stacking used AS2 and a stack of ~400 out of 9000. (Probably a little over the top but no significant degradation in sharpness of the final image and an overall improvment in noise.)
Cheers.
Peter.
Last edited by p_zetner on Sat Jul 15, 2017 1:25 am, edited 1 time in total.
- ffellah
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Thanks very much, Franco!
Here is a view of the active regions 2666 and 2665 in Ca K.
Cheers.
Peter.
Here is a view of the active regions 2666 and 2665 in Ca K.
Cheers.
Peter.
- marktownley
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Looking nice Peter!
I've certainly found with my 8" HaT and double stacked Quark get better results with a longer focal ratio telecentric. With the native HaT telecentric (f27.9) I find the image quite washed out detail wise compared to when I use the Quark with its native telecentric (f43) and then a telecompressor after this to bring things back to a more seeing and pixel sampling friendly f30(ish). That way you keep the tighter bandpass of the filter and I find easier to post process the more contrasty images. I'm sure you've got something tucked away in your comprehensive box of lenses that could rig up
Out of curiousity what is the transmission curve like for the 0.2nm CaK filter from Omega? You're getting nice images from that CaK rig.
Mark
I've certainly found with my 8" HaT and double stacked Quark get better results with a longer focal ratio telecentric. With the native HaT telecentric (f27.9) I find the image quite washed out detail wise compared to when I use the Quark with its native telecentric (f43) and then a telecompressor after this to bring things back to a more seeing and pixel sampling friendly f30(ish). That way you keep the tighter bandpass of the filter and I find easier to post process the more contrasty images. I'm sure you've got something tucked away in your comprehensive box of lenses that could rig up
Out of curiousity what is the transmission curve like for the 0.2nm CaK filter from Omega? You're getting nice images from that CaK rig.
Mark
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- Carbon60
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Nice close ups, there, Peter.
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: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Superb! the CaK is particularly nice work
Alexandra
Alexandra
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Thanks for the feedback, everyone.
Mark: Definitely have to aim for a telecentric with higher f number. I will try to configure f50 with a reducer following. The Omega CaK filter is this one http://www.ebay.ca/itm/Optical-Filter-A ... 2388c6fd30. The claim is 2 Angstrom fwhm with 60% transmission. The filter I bought seems to have pretty uniform throughput .... not always the case with Omega filters. I think I may have posted the optics before. Here's the configuration I use (lenses are Edmund Optics achromats, 40 mm dia.) except the positions of Lunt etalon and Omega filter are interchanged. Image plane is 73 mm from last lens surface.
All the best.
Peter.
Mark: Definitely have to aim for a telecentric with higher f number. I will try to configure f50 with a reducer following. The Omega CaK filter is this one http://www.ebay.ca/itm/Optical-Filter-A ... 2388c6fd30. The claim is 2 Angstrom fwhm with 60% transmission. The filter I bought seems to have pretty uniform throughput .... not always the case with Omega filters. I think I may have posted the optics before. Here's the configuration I use (lenses are Edmund Optics achromats, 40 mm dia.) except the positions of Lunt etalon and Omega filter are interchanged. Image plane is 73 mm from last lens surface.
All the best.
Peter.
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Peter:
Very good H alpha result, the CaK is stunning.
Best regards,
Eric.
Very good H alpha result, the CaK is stunning.
Best regards,
Eric.
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Superb resolution in CaK Peter
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
- p_zetner
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Thanks Eric and Brian.
Still need to work on improving contrast in H alpha.
Best regards.
Peter.
Still need to work on improving contrast in H alpha.
Best regards.
Peter.
- marktownley
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Re: 2nd Foray into Hi-Res Imaging! (Ca K added.)
Thanks for the detail Peter. I've been mulling myself for sometime whether to mount my CaK filters in a telecentric beam as a means to gain some contrast. I was looking at the Omega CaK filter very recently, but my experience with them in the past has always been 'variable'
More shots more often please!
More shots more often please!
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!