H-alpha full-disk SHG images with a Canon 300mm lens

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!
Post Reply
thesmiths
Almost There...
Almost There...
Posts: 1053
Joined: Mon Jun 04, 2012 8:13 pm
Location: London, England
Has thanked: 42 times
Been thanked: 1485 times

H-alpha full-disk SHG images with a Canon 300mm lens

Post by thesmiths »

Versus our most recent 300mm Canon lens update viewtopic.php?p=306081#p306081, we exchanged the 50mm x 50mm 1800 l/mm ruled grating with a 30mm x 30mm 2400 l/mm holographic grating. This increases the contrast (while reducing the amount of light).

H-alpha 2400 l/mm grating
H-alpha 2400 l/mm grating
122050_shift=0.jpg (117.96 KiB) Viewed 648 times

Acquisition parameters: camera ASI 290MM; 0.87ms exposure; gain 0; 331 fps; ROI 1600x100; binning 1x1; 3520 frames; 32x sidereal rate scan (Vixen GP2); Y/X ratio 0.925. Taken 8 Sept 2021, 11:20 UT, London.

Below is a mosaic of different wavelengths around H-alpha. Top left, pixel shift zero, to bottom right, pixel shift +7.

H-alpha shift 0 to +7
H-alpha shift 0 to +7
122050.jpg (383.01 KiB) Viewed 641 times
Last edited by thesmiths on Thu Sep 09, 2021 9:55 pm, edited 1 time in total.


User avatar
marktownley
Librarian
Librarian
Posts: 42131
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20240 times
Been thanked: 10115 times
Contact:

Re: H-alpha full-disk SHG images with a Canon 300mm lens

Post by marktownley »

Very nice! the last pic is my favourite!


Image
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!
User avatar
Montana
Librarian
Librarian
Posts: 34527
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17526 times
Been thanked: 8763 times

Re: H-alpha full-disk SHG images with a Canon 300mm lens

Post by Montana »

They really are amazing, the advances in imaging with an SHG have been huge :bow :hamster:

Alexandra


thesmiths
Almost There...
Almost There...
Posts: 1053
Joined: Mon Jun 04, 2012 8:13 pm
Location: London, England
Has thanked: 42 times
Been thanked: 1485 times

Re: H-alpha full-disk SHG images with a Canon 300mm lens

Post by thesmiths »

Montana wrote: Fri Sep 10, 2021 2:19 pm They really are amazing, the advances in imaging with an SHG have been huge
There's has been some improvement optimising SHG hardware -- and a lot of recent improvement in the software.


Post Reply