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Old Scopes and Modern Imaging

ccd classic equipment imaging
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#1001 myronwasiuta

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Posted 16 December 2022 - 11:29 PM

Absolutely amazing images on this thread from a number of really nice old scopes! I am a fan of old achromatic refractors and have a 4.5" f/15 Brashear and 5" f/14.2 Edmund. While I have posted an image of Mars earlier with the 4.5" Brashear, I have not had a chance yet to see how the Edmund performs. However, on the night of December 13, 2022 I was invited to observe Mars and Jupiter with the 26" Clark refractor at Leander McCormick observatory in Charlottesville, Virginia. Since I go the invite while I was at work, I did not have time to run home and get my trusty QHY 290C camera. Instead, my friend Scott Busby met me at the office and he brought his ZWO ASI 385MC and off we went. 

 

The seeing was pretty good, and at 660X Mars was a sight to behold. After a round of visual observing we attached the camera and captured about 11 2000 frame sequences. Enclosed is an annotated image made from one of those sequences. I think the chromatic aberration present may have softened the image with this camera as visually it looked very sharp with a ton of detail in the dark features and even the NPH showed ragged and mottled detail . The camera may have had more sensitivity in regions not visible to the eye that were not focused as well. Anyway, I wanted to post our results as I don't think there are too many images out there of Mars taken using modern planetary cmos cameras on old large refractors. I will have regular access to this telescope in the future and will post more results as I get them. I'm thinking about trying a technique using monochrome camera with filters, and then combining the images into a color one. Maybe that will effectively deal with the chromatic aberration. Any thoughts? 

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#1002 wargrafix

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Posted 17 December 2022 - 08:32 AM

I love it! I would like to have a Crack at applying some wavelet to the stack.

#1003 myronwasiuta

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Posted 17 December 2022 - 08:58 AM

Sure. We can connect via TeamViewer and do a file transfer or if you have another way you like let me know.
Myron

#1004 oldmanastro

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Posted 19 December 2022 - 10:51 PM

These are a couple of images taken earlier tonight using the Celestar 8 in original mount and a SvBony 305 digital camera. They are the result of 5000 stacked and processed frames. The seeing was about a 7 with excellent transparency. Visually Jupiter and Mars were very nice. On Jupiter that GRS was starting a transit and there is a lot of turbulence around it. On Mars Solis Lacus (the eye of Mars) was clearly visible and it shows in the image. On Mars only one image was possible due to clouds coming in from the east.

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#1005 wargrafix

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Posted 20 December 2022 - 07:39 PM

Those images are truly amazing
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#1006 Bomber Bob

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Posted 21 December 2022 - 03:34 PM

Outstanding results Guido!  You're making my eyes water...


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#1007 oldmanastro

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Posted 24 December 2022 - 10:14 AM

Mars and Sirius + Pup. It was a very clear night yesterday but the seeing was down to 7 and sometimes less. I used the Celestar 8 in original fork mount and wedgepod. Mars was almost at the zenith when I took this image. The Pup could be observed visually and the image shows more or less what I could see at the telescope with the 8mm Carton Plossl. Visually I could see an Airy disc and a diffraction ring that doesn't come out in the image. The Mars image shows a bit of ringing but the eye of mars is evident. 

 

A Merry Christmas to All!

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#1008 ETXer

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Posted 30 December 2022 - 08:47 AM

Outstanding work as always Guido! I think you bring out the most of what the C8 is capable of with it's optics and great conditions of position, seeing, and expert processing. Thanks for posting and happy New Year!


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#1009 myronwasiuta

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Posted 06 January 2023 - 09:50 AM

Here is another shot of mars taken using the Leander McCormick 26" Clark refractor. For this effort we used a monochrome camera (ASI 120MM) and colored filter wheel. By refocusing for each filter, and then combining into an RGB image, we were able to reduce the effects of chromatic aberration in the final image. Large refractors are very susceptible to seeing ( as are all large aperture telescopes) and on this night the seeing was only average at best. Nonetheless we were pretty happy with our results! Hopefully even better results to come if we catch a night with really good seeing!

 

I would like to thank Scott Busby for his tireless efforts and skill at working with our raw data to produce this beautiful image. He used a program called AstroSurface which handles most of the necessary steps in processing planetary images. Speciall thanks goes out to Boris Starosta as well for giving Scott and I ongoing access to this fine telescope!

 

 

 

Myron Wasiuta

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