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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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Belated Mercury Transit and Prom action

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Stardust5858
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Belated Mercury Transit and Prom action

Post by Stardust5858 » Tue Nov 19, 2019 8:46 pm

Hi all, just attached my attempt at producing a full disk and prom action from the transit of mercury on Monday. I'm having difficulty producing and applying flats. All new to me, lol.
Attachments
13_47_49_111119-ebinvert.png
13_47_49_111119-ebinvert.png (3.23 MiB) Viewed 173 times
13_47_49_111119-ebprom1.png
13_47_49_111119-ebprom1.png (1.11 MiB) Viewed 173 times
13_47_49_111119-ebprom.png
13_47_49_111119-ebprom.png (2.25 MiB) Viewed 173 times

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Re: Belated Mercury Transit and Prom action

Post by marktownley » Wed Nov 20, 2019 5:52 am

Nice transit shot!
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Re: Belated Mercury Transit and Prom action

Post by Carbon60 » Wed Nov 20, 2019 6:26 am

Nicely imaged Mercury shot.

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Re: Belated Mercury Transit and Prom action

Post by MAURITS » Wed Nov 20, 2019 8:03 am

Well done Ella.
Last edited by MAURITS on Wed Nov 20, 2019 2:36 pm, edited 1 time in total.
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Re: Belated Mercury Transit and Prom action

Post by Montana » Wed Nov 20, 2019 10:18 am

These are fabulous Nigella :bow :hamster: what problems are you having with the flats?

Alexandra

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Re: Belated Mercury Transit and Prom action

Post by Stardust5858 » Wed Nov 20, 2019 11:07 am

Hi Alexandra, if you look at my image's the illumination isn't uniform causing the image to be lighter one side and darker the other side. I don't think I'm taking them properly. Would you know the work flow for taking flat's with a lunt? Thanks Ella.

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Re: Belated Mercury Transit and Prom action

Post by ffellah » Wed Nov 20, 2019 11:16 am

Very nice results, Ella

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Re: Belated Mercury Transit and Prom action

Post by Montana » Wed Nov 20, 2019 12:48 pm

Hello Ella,
Can you remind me what Lunt you have, is it pressure tuned, double or single stack? Also is this a full disc in one shot?
There are some helpful info here in this post viewtopic.php?f=4&t=26618&p=240113&hili ... ld#p240113 but it is a discussion about a PST full disc in one shot.

It all depends on a lots of things, first why you want a flat but we know that, you say you have an uneven gradient across the disc. Now is this because you are not quite on band over the whole disc (tilt etalon) so need to tweak it a bit, is it pressure tuned (should be more even), or is it double stack (very hard to get a double stack even right across a full disc), or hot spot?

If this is a one shot full disc it is always best to avoid flat fields as the dark area can sometimes cause havoc in the Autostakkert 3 software.
If a tilt tuned etalon, try tweaking the etalon to get best gradient across the disc (same for double stack). If it won't fit in the nice area then the simplest method if you have room on your CCD chip is to gently let the solar disc drift across the field of view during capture. ASK3 will then do a lot of good things during stacking to even the field. If this does not work, try a diffuse bag or cling film over the objective lens and take an image with similar histogram settings (you will likely need a longer exposure time or ramp up the Gain a bit) but take around 100 images and use these to make your flat) however it will have to match the original. It may or may not work.

If it is a hot spot then try and position your solar disc in the best place on your chip to get an even gradient. For my PST the best spot is the very lower left corner. The best 'on band' position isn't necessarily bang in the centre but for visual use you don't tend to notice this, with a camera you will. You do not have to position your Sun in the centre of the CCD chip! this is what the crop tool is for in Phtoshop :)

If none of these work, sometimes it is easier to add a barlow lens and do a mosaic of your full disc instead ;)

Some more details of doing a mosaic here https://solarnutcase.livejournal.com/18572.html

I hope this helps a bit
Alexandra

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Re: Belated Mercury Transit and Prom action

Post by Stardust5858 » Wed Nov 20, 2019 3:14 pm

Hi Alexandra, thanks so much. It's a lunt 60mm pressure tuned but double stacked with 60mm front etalon. Images are full disk useing a 0.5 reducer in the train. I'll try your suggestions. I've only just got the double stack etalon so still have to see which way is best.

Many thanks everyone for your encouraging comments.

Ella.

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Re: Belated Mercury Transit and Prom action

Post by Astrophil » Wed Nov 20, 2019 10:50 pm

That's a nice transit shot. Illumination can sometimes be evened out in an image processing program. Flats don't always work for me either.

Phil

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Re: Belated Mercury Transit and Prom action

Post by Stardust5858 » Thu Nov 21, 2019 12:06 am

Astrophil wrote:
Wed Nov 20, 2019 10:50 pm
That's a nice transit shot. Illumination can sometimes be evened out in an image processing program. Flats don't always work for me either.

Phil
Thanks Phil.

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Re: Belated Mercury Transit and Prom action

Post by DeepSolar64 » Thu Nov 21, 2019 5:47 am

Very beautiful shots! Shows the tiny disc of Mercury quite well.
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Re: Belated Mercury Transit and Prom action

Post by Stardust5858 » Thu Nov 21, 2019 9:37 am

DeepSolar64 wrote:
Thu Nov 21, 2019 5:47 am
Very beautiful shots! Shows the tiny disc of Mercury quite well.
Thanks DeepSolar

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