CaK, 24022019, second try telecentric beam
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CaK, 24022019, second try telecentric beam
The first time I tried the Baader TZ-3 telecentric for CaK imaging, there were extreme reflections. I used it the first time with the Baader blue and K-line before the TZ-3. Today I tried it with the two inch Lunt extension. In there are two filters, not the actual B600 blocking filter which is originally mounted in a diagonal.
The seeing was terrible. between 4 - 6 checking the SSM. So I did 1 minute runs assisted by the SSM and the software Paul build. In these circumstances a SSM is crucial: if I had not bought one, I would have gone back inside after 10 minutes. There were some runs I could grasp somewhere between a 100 and 200 frames. Not a lot to work with. One of the reasons was that I could not get my Grasshopper (IMX 174) running at a normal speed. Just installed the new SDK and now it is running at high speed the way it should.... Exposure was 10ms. No gamma, gain about 1.400
Spacing seemed to be crucial. It was all a bit washed out in the beginning, but after some rebuilding of the image train this is the way it looks now:
20190224_133324_resized by bart moors, on Flickr
It is very long, 61 cm, but does not weigh much: 884 grams. Did not use the Skybender, so mounted the two PST#1 filters in a T2 adapter for 1,25 inch filter cells. Tried to image with and without the Baader K-line (half to it....).
Here are the first two examples, first one without the K-line:
Sun_111432_Gain=1363(off)_Exposure=10.0ms_Gamma=1332(off)42561IMPPG by bart moors, on Flickr
And this one with the K-Line mounted after the TZ-3, before the PST#1 filters.
Sun_131933_Gain=1444(off)_Exposure=10.0ms_Gamma=1332(off)42405IMPPG by bart moors, on Flickr
The results look promising but not revolutionary compared to the "normal double stacking" routine.
- even without tilting the filters, not an extreme amount of reflections.
- it was very hard to focus thanks to the seeing.
- finding the perfect distances for the TZ-3 and the camera will make the results better.
- The PGR IMX174 does a great job. The pixel size seems to fit perfect for f27. And now it runs at a speed it should...
And finally, if you like colours, the version on Astrobin:
Any advice or questions: you are very welcome! Bart.
The seeing was terrible. between 4 - 6 checking the SSM. So I did 1 minute runs assisted by the SSM and the software Paul build. In these circumstances a SSM is crucial: if I had not bought one, I would have gone back inside after 10 minutes. There were some runs I could grasp somewhere between a 100 and 200 frames. Not a lot to work with. One of the reasons was that I could not get my Grasshopper (IMX 174) running at a normal speed. Just installed the new SDK and now it is running at high speed the way it should.... Exposure was 10ms. No gamma, gain about 1.400
Spacing seemed to be crucial. It was all a bit washed out in the beginning, but after some rebuilding of the image train this is the way it looks now:
20190224_133324_resized by bart moors, on Flickr
It is very long, 61 cm, but does not weigh much: 884 grams. Did not use the Skybender, so mounted the two PST#1 filters in a T2 adapter for 1,25 inch filter cells. Tried to image with and without the Baader K-line (half to it....).
Here are the first two examples, first one without the K-line:
Sun_111432_Gain=1363(off)_Exposure=10.0ms_Gamma=1332(off)42561IMPPG by bart moors, on Flickr
And this one with the K-Line mounted after the TZ-3, before the PST#1 filters.
Sun_131933_Gain=1444(off)_Exposure=10.0ms_Gamma=1332(off)42405IMPPG by bart moors, on Flickr
The results look promising but not revolutionary compared to the "normal double stacking" routine.
- even without tilting the filters, not an extreme amount of reflections.
- it was very hard to focus thanks to the seeing.
- finding the perfect distances for the TZ-3 and the camera will make the results better.
- The PGR IMX174 does a great job. The pixel size seems to fit perfect for f27. And now it runs at a speed it should...
And finally, if you like colours, the version on Astrobin:
Any advice or questions: you are very welcome! Bart.
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Re: CaK, 24022019, second try telecentric beam
Very interesting Bart, I'm always looking for convenient ways to do double stack Cak!
Very best,
Very best,
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Re: CaK, 24022019, second try telecentric beam
That's a long image train Bart, it seems to work fine
Pedro Re'
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Re: CaK, 24022019, second try telecentric beam
Yes, it is quite impressive, but consists almost completely of T2-extensions. And the TZ-3 is quite light as well.
One of the funny things is that I can't detect "the double limb" when imaging this way.
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Re: CaK, 24022019, second try telecentric beam
Hi Bart - looks great!
I'm anxious to press my TZ3/0.4 reducer into action when the Sun appears in a few months... Baader does specify the the focus will shift 5 mm for CaK with the TZ3:
"Because they are made for H-apha-filters, they are designed for 656.3 nm (the red H-alpha-light); only the TZ3 is also designed to work at 396 nm very good, although then the focal plane is shifted for ca. 5mm."
I'm anxious to press my TZ3/0.4 reducer into action when the Sun appears in a few months... Baader does specify the the focus will shift 5 mm for CaK with the TZ3:
"Because they are made for H-apha-filters, they are designed for 656.3 nm (the red H-alpha-light); only the TZ3 is also designed to work at 396 nm very good, although then the focal plane is shifted for ca. 5mm."
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Re: CaK, 24022019, second try telecentric beam
Hi Bob,
Thanks! I know: distance from end of TZ-3 to focal planeet should be 24,5 cm. But the thing is, it is not specified what exactly is meant by front and back of the thing.... I now have defined the front of the thread. And positioned that 86mm in front of the original focal point. The back is exact at 25 cm now. So have to try with minus 0,5 cm. But for now I am quite satisfied!
What pixel size are you going to use? When using the PGR there is no use for me to use any focal reducer.
CS! Bart.
Thanks! I know: distance from end of TZ-3 to focal planeet should be 24,5 cm. But the thing is, it is not specified what exactly is meant by front and back of the thing.... I now have defined the front of the thread. And positioned that 86mm in front of the original focal point. The back is exact at 25 cm now. So have to try with minus 0,5 cm. But for now I am quite satisfied!
What pixel size are you going to use? When using the PGR there is no use for me to use any focal reducer.
CS! Bart.
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Re: CaK, 24022019, second try telecentric beam
Hi Bart,
Right now (when the sun comes out), I'll be using my Chameleon w 3.75 um pixels... may get something different in the future.
Right now (when the sun comes out), I'll be using my Chameleon w 3.75 um pixels... may get something different in the future.
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Re: CaK, 24022019, second try telecentric beam
Interesting Bart, this is on my list of things to try.
http://brierleyhillsolar.blogspot.co.uk/
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Re: CaK, 24022019, second try telecentric beam
This experiment just started.... There is a long list of things to do:
- what happens if the PST filters are slightly tilted in a telecentric beam.
- find out the exact distance from the back of the TZ-3 (what is defined as the back?) and the sensor of the camera.
- try triple stacking in a telecentric beam.
- practice more in processing CaK.
- etc.
Will keep you posted!
Bart.
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Re: CaK, 24022019, second try telecentric beam
Hi Bart...
These images turned out very well considering that it was a test setup and poor seeing. I shows the power of the SSM and capture control software.
Well done
Brian
These images turned out very well considering that it was a test setup and poor seeing. I shows the power of the SSM and capture control software.
Well done
Brian
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Maple Ridge Observatory
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
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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
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Re: CaK, 24022019, second try telecentric beam
Thank you Brian! And yes, the SSM really helps.MapleRidge wrote: ↑Mon Feb 25, 2019 3:06 am These images turned out very well considering that it was a test setup and poor seeing. I shows the power of the SSM and capture control software.
In the coming weeks will try and work on the filter train again. But it will stay at f/27 with the Grasshopper. Which means there is not a whole lot of light to work with.