A very high-resolution H-alpha SHG mosaic (morning Feb 15)

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A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by thesmiths »

My friend Jean-Francois Pittet just posted this very nice image over at Astrosurf. He used a Solex on a Bresse4 127mm / 1200mm refractor. The camera was a QHY-178 (using 2x2 binning) and he used a Lacerta Herschel wedge to attenuate. He acquired using SharpCap and processed using our v3.7 software. He stacked using AS!3 (3 frames out of 10) and made a mosaic of 3 regions using iMerge.

I'm hoping to start imaging again shortly and my new project is to get my 140mm / 800mm telescope working with a new SHG upgrade.

H-alpha SHG 127mm / 1000mm mosaic
H-alpha SHG 127mm / 1000mm mosaic
jfp 127mm mosaic.jpg (978.26 KiB) Viewed 1536 times
Last edited by thesmiths on Tue Feb 21, 2023 3:08 pm, edited 1 time in total.


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by DeepSolar64 »

WoW, this is probably the highest resolution Ha SHG image I have seen! Awesome!! I would love to see some less-imaged wavelengths imaged at such high resolution.

James


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by rsfoto »

HI Doug,

Amazing and I see I am light years away from getting such results :lol:


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by DeepSolar64 »

Rainer,
You are an intelligent and crafty individual. I think you can master the SHG. You do amazingly well on your full disks with " conventional " methods. I think you will get the SHG down in time.

Now to see you do it in CaK! I know, you have to walk before you can run!

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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by rsfoto »

DeepSolar64 wrote: Thu Feb 16, 2023 4:46 pm Rainer,
You are an intelligent and crafty individual. I think you can master the SHG. You do amazingly well on your full disks with " conventional " methods. I think you will get the SHG down in time.

Now to see you do it in CaK! I know, you have to walk before you can run!

James
Hi James,

:oops:
I know, you have to walk before you can run!
I need to learn to crawl before I can walk :roll:


regards Rainer

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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by DeepSolar64 »

rsfoto wrote: Thu Feb 16, 2023 5:19 pm
DeepSolar64 wrote: Thu Feb 16, 2023 4:46 pm Rainer,
You are an intelligent and crafty individual. I think you can master the SHG. You do amazingly well on your full disks with " conventional " methods. I think you will get the SHG down in time.

Now to see you do it in CaK! I know, you have to walk before you can run!

James
Hi James,

:oops:
I know, you have to walk before you can run!
I need to learn to crawl before I can walk :roll:
True that, I guess...


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Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by marktownley »

Really quite amazing!


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by Montana »

WOW!!!! :shock:

Alexandra


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by GreatAttractor »

That's amazing. Will we have image-quality parity between SHG and one-shot imaging in 5-10 years, I wonder?


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Re: A very high-resolution H-alpha SHG mosaic (morning Feb 15)

Post by thesmiths »

GreatAttractor wrote: Mon Feb 27, 2023 6:06 pm That's amazing. Will we have image-quality parity between SHG and one-shot imaging in 5-10 years, I wonder?
"One-shot" isn't really quite a single exposure, of course; but I see what you're getting at. SHG has the advantage in wavelength resolution but is more seeing limited. I think the largest aperture I've seen successfully used is 127mm (e.g. at the top of this post). Jean-Francois told me he tried a C8 but the seeing issues were too great.

I think SHG hits it's stride at around 100mm. The cost of full-disk 100mm aperture H-alpha is these days out of reach of almost all users. I think I put together my 106mm aperture SHG for less than US$1000 (not including the telescope, mount and camera).

I think versus 2014, a lot of progress has been due to improved cameras (smaller pixels, higher bandwidth, etc), better software and higher quality lithographic slits. Going forward, if USB-C were to replace USB3.0 in cameras there could be another 2x increase in acquisition speed (from 5 Gbit/s to 10), which will further improve image quality.


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