CaK, 24022019, second try telecentric beam

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bart1805
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CaK, 24022019, second try telecentric beam

Post by bart1805 »

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:

Image20190224_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:

ImageSun_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.

ImageSun_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:

Image

Any advice or questions: you are very welcome! Bart.


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Re: CaK, 24022019, second try telecentric beam

Post by MalVeauX »

Very interesting Bart, I'm always looking for convenient ways to do double stack Cak!

Very best,


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Re: CaK, 24022019, second try telecentric beam

Post by pedro »

That's a long image train Bart, it seems to work fine


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Re: CaK, 24022019, second try telecentric beam

Post by bart1805 »

pedro wrote: Sun Feb 24, 2019 4:23 pm That's a long image train Bart, it seems to work fine
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

Post by Montana »

Fantastic results Bart, well done :bow

Alexandra


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Re: CaK, 24022019, second try telecentric beam

Post by Bob Yoesle »

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."


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Re: CaK, 24022019, second try telecentric beam

Post by bart1805 »

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.


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Re: CaK, 24022019, second try telecentric beam

Post by bart1805 »

Montana wrote: Sun Feb 24, 2019 6:39 pm Fantastic results Bart, well done :bow

Alexandra
Thank you!


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Re: CaK, 24022019, second try telecentric beam

Post by Bob Yoesle »

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.


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Re: CaK, 24022019, second try telecentric beam

Post by marktownley »

Interesting Bart, this is on my list of things to try.


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Re: CaK, 24022019, second try telecentric beam

Post by bart1805 »

marktownley wrote: Sun Feb 24, 2019 8:44 pm Interesting Bart, this is on my list of things to try.
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

Post by MapleRidge »

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 :bow

Brian


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Re: CaK, 24022019, second try telecentric beam

Post by bart1805 »

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.
Thank you Brian! And yes, the SSM really helps.
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.


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