August 13th LS80 DS

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Astrophil
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August 13th LS80 DS

Post by Astrophil » Wed Aug 14, 2019 12:49 am

It was a short session today due to uncooperative clouds but the recently acquired LS80 demanded attention. I added the second PT etalon to the scope and tried it out. Breaks in the clouds were short lived and I rushed the tuning procedure as the images will confirm. Even illumination and detail across the whole disk is a challenge and I am impressed with those who can achieve such images. Guess I'll just have to keep practicing.

Here are todays images.
Phil

This is what I saw most of the time. Reminds of the Moon.
20190813_084435.64_clouds.jpg
20190813_084435.64_clouds.jpg (184.07 KiB) Viewed 127 times

My attempt at tuning the etalons. I really don't see a lot of improvement over the single stack, maybe due to the sky conditions. Hazy.
20190813_103321_ac.jpg
20190813_103321_ac.jpg (482.25 KiB) Viewed 127 times

Prooms were dim in the double stack and I tried to enhance them by inversion with limited success.
20190813_102027_aci.jpg
20190813_102027_aci.jpg (534.22 KiB) Viewed 127 times
20190813_102108_inv2c.jpg
20190813_102108_inv2c.jpg (491.21 KiB) Viewed 127 times

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MAURITS
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Re: August 13th LS80 DS

Post by MAURITS » Wed Aug 14, 2019 5:49 am

Great images Phil.
Regards,
Maurits

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Montana
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Re: August 13th LS80 DS

Post by Montana » Wed Aug 14, 2019 9:30 am

These are fabulous Phil :hamster: even with a double stack you will not see much difference on a quiet sun, you will notice the difference on the limb at a higher magnification as you will not see the double limb.

Alexandra

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Re: August 13th LS80 DS

Post by Derek Klepp » Wed Aug 14, 2019 9:48 am

Phil you are really going to enjoy your setup as the activity ramps up .These are great discs.

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Re: August 13th LS80 DS

Post by marktownley » Thu Aug 15, 2019 2:42 pm

Very good Phil!
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!

Astrophil
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Re: August 13th LS80 DS

Post by Astrophil » Thu Aug 15, 2019 8:10 pm

Thank you all.
Alexandra, That's good to know. I was a little underwhelmed with the addition of the second etalon.
Derek, I can hardly wait for some activity on the sun. In the meantime the best solar images I seen recently are your sunsets! Phenomenal.

I have yet to produce an even illumination when double stacking. In the twenty minutes or so of sunlight since acquiring the scope, I tried rotating components, moving the sun around in the fov, and twisting the tuning knobs. I don't like to resort to post processing tricks, but.
Here is another shot from the same day with the scale reduced by 20% and field flattened in post. Less disk detail but plenty of room for giant proms.

Phil
20190813_101642_1.25x_acm.jpg
20190813_101642_1.25x_acm.jpg (399.26 KiB) Viewed 78 times


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Re: August 13th LS80 DS

Post by ffellah » Fri Aug 16, 2019 2:57 pm

I think your LS80 FD's came out very well, Phil.

Franco

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Re: August 13th LS80 DS

Post by Carbon60 » Sat Aug 17, 2019 7:23 am

Looking good, Phil. It can be really tricky getting an evenly illuminated field of view. Tweaking back and forth between the etalons and rotating the front etalon is the only way. Sometimes the tweaks are really tiny, looking for the ‘orange peel’ texture all around.

That said, whatever you’ve done in post processing works. :)

Stu.
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Re: August 13th LS80 DS

Post by Astrophil » Sat Aug 17, 2019 5:25 pm

Thanks guys for the kind words. I am realizing that full disk imaging is quit different that narrow field or high resolution in terms of capture and processing. Throw in a second etalon and the challenge to achieve a quality image intensifies greatly.

Stu, thanks for taking the time. I will try your suggestions and post the results. This setup has the two pressure tuning etalons and a filter between them at the rear of the scope. Sound advice, thank you.

Post processing of the last image was only a pseudo flat (blur and divide) and a histogram stretch using a gradient mask. I got lucky.

Phil

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