May Solarchat Zoom 14th May 2023

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
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May Solarchat Zoom 14th May 2023

Post by Montana »

Advanced notice for your diary

We have a very special person, our one and only Douglas Smith (thesmiths) is going to chat to us all about the SHG. A bit of background history of the technique, the hardware, the software and then some nice pictures :hamster: :hamster: :hamster:

So remember to add to your diary now and get your questions together :)

Sunday 14th May 2023
18:00UTC

I'll keep this here for the moment, then add it to the main This is Solarchat forum 2 weeks before :)

Alexandra


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Re: May Solarchat Zoom 14th May 2023

Post by thesmiths »

Here are some promotional slides to encourage people to attend. The topics I hope to cover are:
  • A brief history of SHG
  • The important design elements of the instrument
  • Capturing data
  • The image reconstruction software
How to SHG.JPG
How to SHG.JPG (212.73 KiB) Viewed 5177 times
shg talk outline.JPG
shg talk outline.JPG (375.63 KiB) Viewed 3287 times
Last edited by thesmiths on Tue Apr 18, 2023 10:19 pm, edited 1 time in total.


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Re: May Solarchat Zoom 14th May 2023

Post by rsfoto »

Hi Doug,

For sure that will be very interesting.

... but, Moderate cost ? :lol: compared to what ?

Sorry could not resist :mrgreen:

If I would sell mine I would need to get US $ 2,000.00 more or less ...

Rainer


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North 22° West 101°
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Re: May Solarchat Zoom 14th May 2023

Post by thesmiths »

rsfoto wrote: Mon Mar 20, 2023 11:00 pm Moderate cost ? Compared to what ?
I think the real sweet spot for the SHG technique is about 100mm aperture, 700mm focal length. So compare to a double stack Lunt 100.

Lunt comparison.JPG
Lunt comparison.JPG (60.29 KiB) Viewed 5147 times


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Re: May Solarchat Zoom 14th May 2023

Post by rsfoto »

thesmiths wrote: Tue Mar 21, 2023 12:21 am
rsfoto wrote: Mon Mar 20, 2023 11:00 pm Moderate cost ? Compared to what ?
I think the real sweet spot for the SHG technique is about 100mm aperture, 700mm focal length. So compare to a double stack Lunt 100.


Lunt comparison.JPG
Hi,

I hope not to anticipate to 14th May presentation, but does that mean that I get for US $ 2,000.00 what I would get with a Lunt ranging from US $ 6,300.00 to about US $ 10,650.00 ?

Did I understand that correctly ?

Rainer


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Re: May Solarchat Zoom 14th May 2023

Post by thesmiths »

In terms of spectral bandwidth, spatial resolution and ability to look at H-alpha, Ca-K and continuum (which is I think what Lunt means by "fully loaded") at a focal ratio that allows full disk imaging, I think that is in fact a not unreasonable comparison.

I assume by $2,000 you are including the cost of the telescope but not the mount? I think the cost of the spectrometer itself is no more than $1,000. But a 100mm aperture f7 ED doublet is maybe another $1000 (e.g. the Starfield 102mm f/7 ED Doublet Refractor), and a good mount like an HEQ5 Pro at a minimum is required (around another $1000).

With regards to the spectrometer, the two most expensive elements are the grating (around $200) and the camera (around $300). I'm quite sure all the other materials can be sourced at less than $500 in total.


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Re: May Solarchat Zoom 14th May 2023

Post by rsfoto »

Hi Doug,

The US $ 2,000.00 I mention is only for my Sol'Ex complete with camera and 3 stepper motors not including the 60mm telescope. The 60mm finder telescope I am using would be another US $ 130.00 ...

A mount id not included ... and this is also somthing critical. My mounts cost US $ 7,000.00 and are not able to track at 16X (but this is another story) and so I have to stop the mount and acquire my videos during 2.5 minutes in average for getting the full Sun disk through the slit.

The complete optical set from Shelyak is already US $ 550.00 ... The statements that a Sol'Ex can be build for US $ 500.00 mentioned from other authors are a little bit exaggerated :mrgreen:

IMHO without motorizing the Sol'Ex a good focusing and bandwidth choosing is nearly impossible. Also now after playing with my Sol?ex the focusing is in 2d eg. telescope to slit and camera to grating ... and running back and forth from computer to Sol'Ex is a real PITA .... IMHO ...

Especially if one has to print multiple times due to the fact of wrong *.stl files ... :roll: :roll: :roll:

OK, RANT over ...

Rainer

Maybe I can sell my classic car and finance new mounts (NON chinese origin)


regards Rainer

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Re: May Solarchat Zoom 14th May 2023

Post by solar »

Thanks Alexandra.


Vixen 130ss SolarMax 90 BF30 EQ6 Pro, LX200 14, C8 CG5, Megrez80, Lunt 100 DS. EQ 8
ASI 120mm 290mm 432mm Lunt B1800 Cal-K + other stuff.

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Re: May Solarchat Zoom 14th May 2023

Post by ffellah »

I am very interested in attending this and hearing Douglas presentation.

Franco


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Re: May Solarchat Zoom 14th May 2023

Post by highfnum »

where will link to zoom be?


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Re: May Solarchat Zoom 14th May 2023

Post by thesmiths »

highfnum wrote: Sat May 13, 2023 6:38 pm where will link to zoom be?
The Zoom link is in the copy of this thread that is in the main Solarchat forum now: viewtopic.php?p=384381#p384381


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