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The Sun - 28-03-2012

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The Sun - 28-03-2012 was created by michaeloconnell

I tried a full disc mosaic this evening except at a higher resolution than yesterday's effort.
Much happier with this one.
Mosaic still isn't perfect, but it's better than yesterday's effort.
Went a different route with the background illumination also.

www.astroshot.com/Solar/2012/12-03-28-Mosaic-Full.jpg
(900kb download)

Image taken with: DMK21, Coronado SM90 filter and BF15, TEC140.
Image processed in Autostakkert and Photoshop.
Earth shown to scale in top left.
Last edit: 10 years 10 months ago by michaeloconnell.
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Replied by dmcdona on topic Re: The Sun - 28-03-2012

Michael - that is a truly stunning image. I even had to quickly leave the study to go get some factor 20 sunscreen - it was so real.

I'm not sure what you mean about the mosaic being imperfect - I can't see any misjoins.

There is another fella I see solar images from me which are extremely impressive (Alan Friedman - avertedimagination.com/main1.htm). Your image is of that calibre.

Simply stunning - well done.

Dave
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Replied by mykc on topic Re: The Sun - 28-03-2012

Wow, great image, I spent ages poring over the details.
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Replied by michaeloconnell on topic Re: The Sun - 28-03-2012

Thanks lads.
When you spend a long time processing an image, the eyes can go a bit square....


I think I've a bit to go before I get to Alan Friedman's level.
The work he produces is in a different league altogether.
Something to aspire to though.
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Replied by dmcdona on topic Re: The Sun - 28-03-2012

You're too modest Michael - at worst, its a very small step for you. At best, you're already there.

Your image above is definately in the Friedman league.
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Replied by ayiomamitis on topic Re: The Sun - 28-03-2012

Michael,

I hate to admit it but that is a GREAT image. :P

Out of curiosity, have you looked into using a CCD camera in conjunction with your set-up? My only possible concern is the BF15 for two reasons: (1) small(er) field of view and (2) the diagonal would seem no match for a heavy CCD camera.

I have a sneaky suspicion results via a CCD camera would take such a result one level higher.

Anthony.
Anthony Ayiomamitis
Athens, Greece
www.perseus.gr
Last edit: 10 years 10 months ago by ayiomamitis.
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Replied by michaeloconnell on topic Re: The Sun - 28-03-2012

I don't know...
The main benefit of the DMK cameras is the number of frames.
They also use Sony CCD chips which are low noise anyway.
I normally take 2,000 frames per video file.
However, for this exampe, I limited it to 1,000 frames per video and took 21 videos to form the mosaic.
That's over 6GB of video.

The DMK21 is great as it can take 60fps - really helps to cut through the atmospheric turbulence.
However, it's only 640 x 480, so at long focal lengths, it takes a lot of work to create a mosaic.

I have a DMK41 on the way: 1280 x 960
Max frame rate is 15fps
Should make creating mosaics much easier.
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Replied by ayiomamitis on topic Re: The Sun - 28-03-2012

Michael,

My rationale and suspicion is based on the fact a CCD camera is truly 16-bit and therefore we have greater dynamic range and also much more sensitive which means much quicker exposure times. As an aside, the large(r) chips with CCD cameras will also mean it will be easier to construct a mosaic.

If you do have access to a CCD camera, I sincerely think it will be worth a test. Simply identify the proper exposure (ex. 0.03 seconds) and then let the camera do its thing over the next ten minutes. Yes, there is also the delay due to the download of the larger CCD image files but I believe this is a moot point.

This is the route I plan to pursue (hopefully this year).

Anthony.
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www.perseus.gr
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Replied by michaeloconnell on topic Re: The Sun - 28-03-2012

I just have an SBIG ST8XME, which is 1530 x 1020.
However, I'm not sure if I will get blooming with such a bright target.
It may take an age to get a significant number of frames though.
Must give it a try sometime.
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Replied by ayiomamitis on topic Re: The Sun - 28-03-2012

Michael,

My ST-10XME which is NABG has an exposure which gets down to 0.11 sec and no more. In contrast, my ST-2000XM which is ABG can get down to 0.001 sec.

I know the ST-8XME comes in two flavours ... ABG and NABG. If you have the ABG version and perhaps an available exposure of 0.001 seconds, you should be able to do some work!

Like I mentioned earlier, once I have results in this regard, I will make sure to post them for your benefit since my intention is to go via the CCD route.

Anthony.
Anthony Ayiomamitis
Athens, Greece
www.perseus.gr
Last edit: 10 years 10 months ago by ayiomamitis.
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