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Topics - rdryfoos

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Gallery / Cygnus Wall
« on: 2019 October 13 10:45:25 »
TOA 130 with ASI 1600--about 24  hours of data.  It is surprising what details  a 5" scope can pick up.

Gallery / The Rosette Menagerie
« on: 2019 September 06 13:47:32 »
This is a close in of the famous zoo (llama, dog, elephant, leopard, monkey etc....etc.  This is a crop of an image collected with TOA 130 and .7x reducer with STT-8300. I am used to working with more data--because my sky is not very good. This came out OK considering.  This another target I want to capture with the ASI 1600 and compare, as I feel I over processed this data a bit.  Full resolution is too much.  I guess I should have down-sampled after I cropped so that no further enlargement was possible.

Ha: 9 30 min
OIII: 11 30 min
SII: 5 30 min

Gallery / Bubble Nebula Hubblle Palette
« on: 2019 September 06 13:37:56 »
TOA 130 with ASI 1600 and Astrodon 3nm Narrow band filters
Ha 136 300sec
OIII: 70 300 sec
SII" 127 300 sec

I shot this previously using the STT-8300 and felt I over processed the image (there were sharpening artifacts).  So my goal was two fold, 1) it was a direct comparison between the STT-8300 and the ASI-1600 and 2) I wanted to improve the processing.


Gallery / M13
« on: 2019 September 06 13:27:38 »
My goal with this image was to emulate the resolution that Hubble achieved with the core--to reveal space between the stars and not just a blinding glare--kind of like some of the excellent images of globulars taken with very large scopes when the cluster fills the FOV.  Image particulars in the links

I just noticed the particulars are not with the images so: TOA 130 with ASI 1600 and Astrodon Series E Gen 2 filters.  This is an RGB composition with a synthetic luminance made with the green channels stack (The green stack  had a FWHM of less than 2.0, which is good for me, so seemed appropriate).
Red: 25 5 min
Green: 40 5 min
Blue: 32 5 min

2 versions--not sure which I prefer--number 1 for normal mviewing and #2 for full resolution I think.  Let me know if you concur.




Gallery / sh2-132 Hubble Palette
« on: 2019 September 02 18:01:56 »

TOA 130 with ASI 1600 with 3nm Astrodon filters
Ha: 124 300 sec
OIII 107 300 sec
SII 32: 300 sec

Gallery / Sh2-132 Bicolor
« on: 2019 August 25 16:38:32 »
TOA 130 with ASI 1600 and 3nm Astrodon NB filters
Ha: 124 300 sec
OIII: 43 300 sec

I started out wanting to mimic RGB using Ha and OIII--but somewhere along the line the Hubble Palette took over.  I do have a red version of this image--but for some reason I am partial to the golden hues of the SHO palette--without the blue nhere, of course.  Which is ironic, since OIII was used for both blue and green

General / Adding high resolution data to lowere resolution image
« on: 2019 August 21 19:25:04 »
I Pixinsight how does one add higher resolution data to widefield images without losing the FOV?  I can add lowere resolution data to higher resolution data--but that is not what I want to do.  When ever I try it, I am left with an image that has the smaller images FOV.  Here is an example--these are only JPEGS so a demsonstration is not required.  I want to add the higher resolution TOA 130 data into the wider field lowere resolution FSQ data.

I know it can be done in photoshop--its done all the time.  I am sure it can be done in Pixinsight--but I have no idea how to do it

I have included liks to the two images--the size restriction of the web page is really a PITA

Wide field--I want to add the second image to this one

Higher resolution data--I want to add this data to teh first image

Please--anyone.....eveal the magic!!!!

General / Mottles in Red channel
« on: 2019 April 17 08:21:27 »
Does anyone know what causes chromatic mottling in higher signal areas of an RGB (SHO) image?  I say high signal areas to mean non background regions.  I am not referring mottled background.  Take a look at the crop from the Rosette nebula in Hubble palette.  I do not always have this problem--but sometimes.  I tried combining these stacks 2 ways--first without linear fitting to the Ha stack (the brightest) and then after linear fitting to the Ha stack (per the Light Vortex Video that indicates this is the proper way--not the way we were taught at the PI seminar, so I have my doubts).  But--regardless, I get mottles that show up in the red channel either way.  I have inspected all the channels, and it turns out that when scrolling through the RG and B channels when looking at the image, the mottles are in all channels--but they manifest themselves in the red channel (in blue for instance they look like dark regions, and in green, less dark).  But in the simplest terms--it is mottling in the red channel and I have tried everything to remove it as well as to prevent it and nothing seems to work.


Gallery / M82 HaRGB and an experiment
« on: 2019 April 04 13:40:31 »
TOA 130 with ASI 1600.  No luminance yet--just Haand RGB.  I am looking forward to collecting some lum.  I decided to take longer subs with teh bASI 1600.  previously I had been taking hundreds of 30-60sec subs, but was never really satisfied.  I think the longer subs help (its my processing that topples the turnip cart!)

Red: 46 300 sec
Green: 53 300 sec
Blue 51 300s ec

The second image is a true experiment.  All I had at teh time was Red, Green and Ha.  I though--"what can UI make from that?"  The answer is this image--much more natural looking than I had thought it would be.  I find it amazing that there is such a strong blue presence when there is no blue data in the image.  It kind of reminds me of the Hubble Palette.


Gallery / M78 HaLRGB
« on: 2019 February 24 10:19:41 »
I felt I had no choice but to remove the old topic--the image had to go!!  Here is a much better representation of this target with the data at hand.

Gallery / Cone Nebua HaLRGB
« on: 2019 February 07 16:14:30 »
FSQ 106 with .6x reducer and ASI 1600.
224 60 sec red
223 60 sec green
205 60 sec blue
205 60 sec Lum
38 300 sec Ha

I created a super luminance of all  895 subs, then used the tutorial (light Vortex) for adding Ha to the red and lum.

Gallery / Cacoon Nebula close up and wide field comparison
« on: 2019 January 21 13:39:58 »
The close up was shot with the TOA 130 at F7.7 with the STT-8300, and the wide field shot was taken with FSQ 106 with the .6x reducer (F3) with ASI 1600.

Close up:
Lum-15 20 min
Red-24 10 min
Green-20 10 min
Blue 19 10 min
Ha 6 30 min

Wide Field
Red 214 30sec
Green: 168 30sec
Blue: 118 30 sec
Lum: 172 30sec


Gallery / Thor's Helmet Widefield
« on: 2019 January 21 13:26:38 »
I wider perspective of this iconic target than is typically portrayed.  Note the widely dispersed Ha emissions.  This was shot under terrible conditions with the FSQ 106 and .6x reducer and ASI 1600 with 3nm Astrodon filters.  A bicolor HOO composition.  The target is very low in teh southern sky for me, right in the light dome of a nearby city, so decent data is hard to come by.

Ha: 86 5min
OIII: 55 5min


Gallery / IC-1396 Close up and far removed
« on: 2019 January 21 13:21:40 »
Here's a comparison of the Elephant's trunk close up vs widefield.  The close-up image was shot with the TOA 130 and STT-8300 with 3nm Astrodon filters, and the wide field was shot with the FSQ 106 with .6x reducer and ASI 1600 mmcool pro with Astrodon filters

Clos Up:

Wide Field:


Gallery / Tadpoles, Spider and Fly
« on: 2019 January 21 13:16:42 »
The fly looks more like a frog, and the tadpoles more like embryo fertilization.  HaSHO composition with FSQ v106, .6x reducer and ASI 1600
A bit OIII light, but considering the weather and the MOON, I was lucky to get ANY OIII

Ha: 51 300 sec
OIII: 26 5min
SII: 123 5min

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