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CCSSC's First Light with DMK51

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#1 Cameron McCarty

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Posted 21 November 2012 - 03:09 PM

Hey y'all!

We here at the Coca-Cola Space Science Center just invested in a new camera, as per Mr. Ramsden's suggestion and we got a DMK51!

It was a bit cloudy today, but we have our very first light!

I believe our etalons on our SolarMax II 90mm Ha scope have to be adjusted, BUT we got a pretty nice image to begin with :)

What do y'all think? Any advice?

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#2 drksky

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Posted 21 November 2012 - 04:39 PM

Is it a double stack? If so, then you do need to do some tuning. You're picking up the sunspots and some spicules, but losing everything else. Check out my Astrobin page in my signature for some examples for this exact combination and what it's capable of.

Right off the bat, it looks like your exposures are a bit too short (shutter speed) or you're darkening it too much in post. But, a very good start.

#3 sullij1

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Posted 21 November 2012 - 10:49 PM

What Tony said but SOOOOOOOOOOOOOOOOOOOOOOOO much better Cameron.

#4 sullij1

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Posted 21 November 2012 - 11:05 PM

Tune the scope and then:

Try Marks tutorial here for full disks. Skip the part about mosaic images and go straight to processing the full image.

http://brierleyhills...-tutorials.html

Glad ya took the Georgians advice. :jump:

#5 Cameron McCarty

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Posted 28 November 2012 - 05:56 PM

drksky those are amazing! Do you have any advice on how to best tune the scope? I've been trying, but as you can see haven't gotten anywhere near those results. Then again this is only the 1st week with it

#6 Cameron McCarty

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Posted 29 November 2012 - 12:05 PM

Hey! So I did a bit of adjusting and I am really happy with the results thus far!

Here is our newest image from today!

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#7 drksky

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Posted 29 November 2012 - 12:40 PM

I tune the scope visually first. Firs adjust the internal etalon to get the most detail, then go to the external and do the same. You'll then have to go back to the internal to fine-tune it. I have found that on our 90DS, the external needs to be turned all the way to one side of it's available motion, then I fine-tune with the internal. Once I find the best tuning using a wide-field eyepiece, I install the camera and refocus.

Most of my images are taken with the camera set to the lowest gain possible and adjusting the exposure with the shutter speed. I'm usually taking 30 seconds of each quadrant which comes to 4-500 frames. In Registax, I'm generally rejecting all but the top 20%.

#8 sullij1

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Posted 29 November 2012 - 03:02 PM

Now yer gittin it!

#9 raylal

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Posted 29 November 2012 - 07:11 PM

You are getting it for sure. Nice work.

Ray

#10 Cameron McCarty

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Posted 30 November 2012 - 10:15 AM

Thanks you guys for all your support! The only thing I've been wondering about now is capturing the proms. I took a few sets at varying exposures and I had one where the proms in the image above weren't over exposed, but I didn't get the faint glow or the fainter proms. Is there anyway to bring all of them out or is it just pick and choose?

#11 Bob Moore

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Posted 30 November 2012 - 11:22 AM

Nice Cameron!

#12 sullij1

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Posted 30 November 2012 - 11:56 AM

You can Overexpose the disk for proms and then shoot the normal exposure and place it over the overexposure with masks. Or use curves or levels to raise the exposure of a normal disk until the proms start to show or you can use a combo of the 2 ala Ken Crawford masks:

http://www.imagingde...ar_FullDisk.htm

#13 drksky

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Posted 30 November 2012 - 12:21 PM

I'm starting to wonder if it won't be better to capture all the proms with the scope configured as a single stack and expose for the proms only, then put the double stack back on and expose for the disk.

What I've been fighting with is when double-stacked, you can get the brighter proms in the disk exposure, but when you overexpose to get the dimmer proms that kills the brighter ones that you get when exposing for the disk. Unless I just need to work with the masks more and selectively mask for just the dimmer proms.

Still got a lot of playing around to do.

#14 Cameron McCarty

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Posted 30 November 2012 - 12:28 PM

That's what I;ve been finding too, those bright proms are knocking out the dim ones. Do you think it would work well with just the single stack for those?

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#15 Cameron McCarty

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Posted 30 November 2012 - 12:38 PM

vs the dim proms

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#16 drksky

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Posted 30 November 2012 - 12:58 PM

I've been wanting to experiment, but due to the sun setting so darned early, I can only do solar work on the weekends. And it's autumn in Illinois, which means that we're cloudy more than not. Haven't gotten a really good day since we permanently mounted the scope in our observatory.

#17 stephenramsden

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Posted 23 April 2013 - 09:14 AM

Cam! thats a fantastic full disk up there bud.!

#18 Aquarist

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Posted 23 April 2013 - 10:55 AM

Yes, lots of progress and a very nice image!






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