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Topics - rdryfoos

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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

Gallery / Sadr Region HaSHO
« on: 2019 January 21 13:09:33 »
It's hard to believe that space around Sadr is filled with these wondrous nebulae.  If only our eyes were more sensitive (it looks pretty amazing in LRGB too).  Another FSQ 106 with .6x reducer and ASI 1600 image.  The small nebula very close to Sadr gave me a lot of trouble until I picked another Pixinsight lock! 

Ha 53 5 min
OIII: 74 5 min
SII 70 5min

Gallery / NGC-1333
« on: 2019 January 21 13:00:37 »
I call it the Balrog Nebula, and, like Gandalf, it has been my nemesis.  This is the best I can do with over 20 hours of data.  I only collected 391 1 mijn lum subs, but I made a super luminance out of 1,348 subs (The LRGB).  What a trial by fire!

FSQ 106 with .6x reducer and ASI 1600 mm cool pro with Astrodon true balance series E filters
Red: 353 60 sec
Green: 302 60 sec
Blue: 302 60 sec
Lum: 391 60 sec


Gallery / Heart Nebula
« on: 2019 January 21 12:54:55 »
HaSHO composition using FSQ 106 and .6x reducer and the ASI 1600 mm cool pro with 3nm Astrodon filters.  I like the wide FOV and the heightened resolution afforded by 3.8nm pixels. 

Ha: 29 5min
OIII: 38 5min
SII: 31 5min


Gallery / NGC 6823 HaSHO
« on: 2019 January 19 08:15:56 »
FSQ 106 with .6x reducer (F3) and ASI 1600 mm cool pro with 3nm Astrodon filters
26 hours in 5min subs (Ha 142, OIII 90, SII 72)

Gallery / M31 HaLRGB
« on: 2018 November 03 10:02:28 »
HaLRGB with FSQ 106 EDIV with .6x reducer and ASI 1600 with Astrodon filters

General / Drizzle Integration and alignment
« on: 2018 September 18 05:00:01 »
When I align my subs I align all subs at the same time to the same reference sub.  Is this a good idea with drizzle?  I fear that when the software is progressing through the operation, it will not differentiate between the last sub of the Ha channel, lets say, and the first sub of the OIII channel.  When I separate the various channels through integration,  will there be issues?


Gallery / Gamma Cygni in HaSHO with RGB stars
« on: 2018 August 13 06:02:25 »
FSQ 106 with .6x reducer (F3) and ASI 1600mm coolpro with Astrodon 3um narrowband filters and Gen II Series E true balance LRGB filters.

Ha 54 5min
OIII: 74 5 min
SII: 70 5 min
Red: 120 60 sec
Green: 125 60 sec
Blue: 110 60 sec.

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