AR2706 21 april
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
AR2706 21 april
Could experiment a bit more today.
D-erf 160mm / Skywatcher 150mm f8 / Baader Glasspath 1,25X / 35nm H-Alpha / PST etalon / Lunt B1200 BF/ 2,5x Powermate / 2 degrees wedgeprism / PGR Grasshopper IMX174.
This one is a single stack:
21042018_12h42m_SW150_GP1,25x_PM2,5x by bart moors, on Flickr
And one hour later the first try of doublestacking the 150mm Skywatcher:
21042018_13h40m_SW150_GP1,25x_PM2,5x_Doublestack by bart moors, on Flickr
Thanks for watching!
D-erf 160mm / Skywatcher 150mm f8 / Baader Glasspath 1,25X / 35nm H-Alpha / PST etalon / Lunt B1200 BF/ 2,5x Powermate / 2 degrees wedgeprism / PGR Grasshopper IMX174.
This one is a single stack:
21042018_12h42m_SW150_GP1,25x_PM2,5x by bart moors, on Flickr
And one hour later the first try of doublestacking the 150mm Skywatcher:
21042018_13h40m_SW150_GP1,25x_PM2,5x_Doublestack by bart moors, on Flickr
Thanks for watching!
Last edited by bart1805 on Sun Apr 22, 2018 6:36 am, edited 1 time in total.
- ffellah
- Way More Fun to Share It!!
- Posts: 11172
- Joined: Mon Oct 27, 2014 6:46 pm
- Location: Westport, CT USA
- Has thanked: 9145 times
- Been thanked: 6025 times
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: AR2706 21 april
Very nice!
What blocking filter are you using?
What blocking filter are you using?
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks Merlin and Franco!
@Merlin: Lunt B1200, forgot to mention it so edited the post.
@Merlin: Lunt B1200, forgot to mention it so edited the post.
- Carbon60
- Way More Fun to Share It!!
- Posts: 14209
- Joined: Wed Mar 07, 2012 12:33 pm
- Location: Lancashire, UK
- Has thanked: 8418 times
- Been thanked: 8163 times
Re: AR2706 21 april
Good images, Bart. Nice to see some activity for a change.
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
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: AR2706 21 april
These are brilliant Bart!
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!
- robert
- Way More Fun to Share It!!
- Posts: 3069
- Joined: Fri Oct 14, 2011 1:49 pm
- Location: N.W.Scotland
- Has thanked: 4 times
- Been thanked: 1274 times
- Contact:
Re: AR2706 21 april
Very fine, especially the first one
Robert
Robert
images and animations http://tinyurl.com/h5bgoso
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: AR2706 21 april
Definitely looks to be a good PST etalon
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!
-
- Way More Fun to Share It!!
- Posts: 12900
- Joined: Wed Oct 19, 2011 10:02 am
- Been thanked: 171 times
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks guys. I sometimes wonder what is more important: a good etalon or a good combination of different things in which the etalon is just a part:
seeing / transparency
the telescope plus camera combination
a really good focus
the settings of the camera
the processing
Off course if you have the luck to have a really good etalon, or like Valery are able to select the very best out of a lot of etalons it matters. But if Valery and I would have both the same quality etalon and the same telescope, I do believe his images would be better. And someone who is able to really process a stacked image well gets better results with a normal etalon than someone who is less good at processing with the very best etalon.
For me personally it looks like the seeing is most important and is getting more important with 150mm than with 127 and 100 mm. If the seeing is far from optimal, I really struggle to get the right focus, even with Gamma set at zero. And maybe that is true for most of us here. We talk about the quality of the etalon, for me it is something I have little control on. It is just what I have. Would be interesting to post a link to a avi. And see what everyone makes of it. What results would different ways of processing result in? Would it go from not bad, quite ok, really good to fantastic?
seeing / transparency
the telescope plus camera combination
a really good focus
the settings of the camera
the processing
Off course if you have the luck to have a really good etalon, or like Valery are able to select the very best out of a lot of etalons it matters. But if Valery and I would have both the same quality etalon and the same telescope, I do believe his images would be better. And someone who is able to really process a stacked image well gets better results with a normal etalon than someone who is less good at processing with the very best etalon.
For me personally it looks like the seeing is most important and is getting more important with 150mm than with 127 and 100 mm. If the seeing is far from optimal, I really struggle to get the right focus, even with Gamma set at zero. And maybe that is true for most of us here. We talk about the quality of the etalon, for me it is something I have little control on. It is just what I have. Would be interesting to post a link to a avi. And see what everyone makes of it. What results would different ways of processing result in? Would it go from not bad, quite ok, really good to fantastic?
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: AR2706 21 april
For me the seeing is by far the biggest factor in getting decent images...
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!
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Hi Valtori,
Thanks! Two pst etalons and a High Transmission Circular Polarizer in between them. Bart.
Thanks! Two pst etalons and a High Transmission Circular Polarizer in between them. Bart.
-
- Way More Fun to Share It!!
- Posts: 12900
- Joined: Wed Oct 19, 2011 10:02 am
- Been thanked: 171 times
Re: AR2706 21 april
Bart I have found that yes as the aperture increases the conditions become much more important.I find conditions are seldom good enough here for 150 and rely more on 100mm for Ha and either 80 or 127 for CaK.These really are superb results so you have a great set up there.
- yltansg
- Way More Fun to Share It!!
- Posts: 2798
- Joined: Sat Jun 14, 2014 9:33 am
- Location: Singapore (1.3N, 103.7E)
- Has thanked: 1446 times
- Been thanked: 1423 times
Re: AR2706 21 april
Hi Bart,
Excellent duo!! Can you share your workflow used in your post-processing?
Alfred
Excellent duo!! Can you share your workflow used in your post-processing?
Alfred
- marktownley
- Librarian
- Posts: 42274
- Joined: Tue Oct 18, 2011 5:27 pm
- Location: Brierley Hills, UK
- Has thanked: 20442 times
- Been thanked: 10247 times
- Contact:
Re: AR2706 21 april
Yes, very nice post processing it is too!
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!
Re: AR2706 21 april
Great view in that DS image!
Also, under difficult conditions (I seem to get a lot of practice at this) I make focus and etalon adjustments using the histogram. For focus, adjust the telescope's focus control for a maximum of the peaks of the histogram. That is because when the telescope is in focus, some bright bits will be in focus and will show up at the peak of the histogram, whereas when not in focus, those same points are being averaged with other, darker areas.
The opposite is true for the etalon (I have only one). Look for a dip in the histogram. For this, I look at more like the upper 1/4 of the histogram, rather than just the peaks, as I do with focusing. The histogram will reach a minimum when the etalon is properly tuned because at that point you have achieved the best contrast, which causes many points to be darker than when the etalon is not properly tuned.
For me, the frame rate of the camera is an important factor in focusing. I'll reduce the ROI for a bit if I have to in order to get a frame rate of at least 30/sec so that I can have close to real-time feedback of my adjustments.
Also, under difficult conditions (I seem to get a lot of practice at this) I make focus and etalon adjustments using the histogram. For focus, adjust the telescope's focus control for a maximum of the peaks of the histogram. That is because when the telescope is in focus, some bright bits will be in focus and will show up at the peak of the histogram, whereas when not in focus, those same points are being averaged with other, darker areas.
The opposite is true for the etalon (I have only one). Look for a dip in the histogram. For this, I look at more like the upper 1/4 of the histogram, rather than just the peaks, as I do with focusing. The histogram will reach a minimum when the etalon is properly tuned because at that point you have achieved the best contrast, which causes many points to be darker than when the etalon is not properly tuned.
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks Alfred! I just try al lot in IMPPG and Photoshop.But normally I load the image in IMPPG. Sigma down to 1,2 and set the tone curve as I think the picture looks best. When I did not make a flat (did make one with AR2706) I make a layer in Photoshop and apply Gaussian blur, invert the layer and use linear light. Make it one layer again. Then make a new layer and apply a High Pass filter, radius o,3 or 0,4 pixels. Use linear or weak light and make it one layer again. Then see if it is useful to apply unsharp mask, very very lightly. After that reduce the noise. And in the end use curves to make the final adjustments. It is a bit like that.
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks Bruce! And thank you for the tips. Just checked and in preview I have now set the preview framerate at max.Bruce Girrell wrote: ↑Tue Apr 24, 2018 2:42 pm Great view in that DS image!
For me, the frame rate of the camera is an important factor in focusing.....
Also, under difficult conditions (I seem to get a lot of practice at this) I make focus and etalon adjustments using the histogram.
Interesting in how you focus using the histogram. I tune the etalon to the point where it gives the most contrast, that I can clearly see on my screen even with less good seeing. I will try your advice and see what happens.
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks Derek! Yes, that is my experience too. I think I have finally hit the point where aperture fever comes to a stop. But..... A couple of months ago I bought a used Intes Alter M703. It will be checked, cleaned and collimated next week. Made an adapter so I can use the 160mm D-Erf on the 703. So hopefully in a couple of weeks I can show you the results of this Russian beauty. If it works it will be a whole lot easier to carry everything to the garden and far less wind exposure.Derek Klepp wrote: ↑Tue Apr 24, 2018 9:16 am Bart I have found that yes as the aperture increases the conditions become much more important.I find conditions are seldom good enough here for 150 and rely more on 100mm for Ha and either 80 or 127 for CaK.These really are superb results so you have a great set up there.
Re: AR2706 21 april
You can also reduce ROI to increase the frame rate. One of my cameras has a large sensor and the max frame rate is something like 15 fps. Most of the time it's slower than that. So for that camera I almost always have to reduce ROI to get a frame rate fast enough for focusing.bart1805 wrote: ↑Tue Apr 24, 2018 7:24 pm Thanks Bruce! And thank you for the tips. Just checked and in preview I have now set the preview framerate at max.
Interesting in how you focus using the histogram. I tune the etalon to the point where it gives the most contrast, that I can clearly see on my screen even with less good seeing. I will try your advice and see what happens.
I suggest trying out my adjustment methods on a day when you have fairly decent seeing. The focus peak and etalon dip should be readily apparent. Both should be very close to what you would set using direct observation of the image. When the seeing gets poor, I trust the histogram more than my eyes.
Bruce
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
I will let you know what the results are, quite curious if it works for me. Would be a nice solution!Bruce Girrell wrote: ↑Wed Apr 25, 2018 5:03 pm I suggest trying out my adjustment methods on a day when you have fairly decent seeing. The focus peak and etalon dip should be readily apparent. Both should be very close to what you would set using direct observation of the image. When the seeing gets poor, I trust the histogram more than my eyes.
Bruce
- MapleRidge
- Way More Fun to Share It!!
- Posts: 10199
- Joined: Fri Jan 13, 2012 11:58 pm
- Location: Cambray, ON Canada
- Has thanked: 64 times
- Been thanked: 4340 times
- Contact:
Re: AR2706 21 april
Very sharp images Bart...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
- Valery
- Way More Fun to Share It!!
- Posts: 4059
- Joined: Sun Nov 18, 2012 3:13 pm
- Has thanked: 156 times
- Been thanked: 893 times
Re: AR2706 21 april
bart1805 wrote: ↑Tue Apr 24, 2018 7:29 pmThanks Derek! Yes, that is my experience too. I think I have finally hit the point where aperture fever comes to a stop. But..... A couple of months ago I bought a used Intes Alter M703. It will be checked, cleaned and collimated next week. Made an adapter so I can use the 160mm D-Erf on the 703. So hopefully in a couple of weeks I can show you the results of this Russian beauty. If it works it will be a whole lot easier to carry everything to the garden and far less wind exposure.Derek Klepp wrote: ↑Tue Apr 24, 2018 9:16 am Bart I have found that yes as the aperture increases the conditions become much more important.I find conditions are seldom good enough here for 150 and rely more on 100mm for Ha and either 80 or 127 for CaK.These really are superb results so you have a great set up there.
Hi Bart,
Stay with 150mm refractor. 10mm aperture increase will not make a notable resolution increasing. Refractors give the best contrast.
Only full aperture of 703 can deliver a bit better resolution.
"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.
-
- Almost There...
- Posts: 636
- Joined: Mon Feb 06, 2017 9:04 pm
- Location: The Netherlands
- Been thanked: 1 time
Re: AR2706 21 april
Thanks Valery, You are right about the resolution. But I will try it anyway. Really curious how the Alter operates in H-Alpha.