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Messages - robhawley

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TAC Imaging / Re: California Nebula NGC1499 in Perseus
« on: May 18, 2017, 03:21:40 PM »
If you are interested this is my photo using narrowband.

Narrowband is able to separate the various elements.

TAC Imaging / Re: Using Astro Cameras on the Eclipse?
« on: May 18, 2017, 03:19:57 PM »
I would be skeptical about using an astro camera for the eclipse.  Your shutter speeds will be short.  Astro cameras are not typically designed with fast shutters (hence the discussing in flat fielding of minimum exposures).

As far as brightness you can get an idea from the table in mreclipse

TAC Imaging / A Different View of the North American Nebula
« on: September 17, 2015, 12:53:49 PM »
The North American Nebula (NGC 7000) is one of the most popular imaging targets in the northern hemisphere.  Almost every imager has a shot of it plus the nearby Pelican (IC 5070). Normally these images are either in color (L + RGB) or Hubble Palette (Suflur, Hydrogen, Oxygen).  My test shots of the nebula convinced me that using Nitrogen rather than Sulfur would make for more interesting image.

In most narrowband images of this object the "Hydrogen" component is actually H + Nitrogen.  The Nitrogen line is close enough to the H alpha line that it requires a 3 nm filter like I am using to separate the two. Doing so opens the possibility of viewing a nebula in a different way.  Note that the Hubble also uses 3 nm filters so their Hydrogen is just Hydrogen.

The processing of these images was greatly influenced by the 2014 Katonah NY Pixinsight workshop.  Applying what I learned in Katonah gives an image that is much richer in color.  Without the color processing Green (Hydrogen) would dominate the image. The rich colors along the edges of the nebula become apparent in the more balanced image.  It should be noted that the final image no longer represents the amounts of the three elements.  It does make it easier to see the distribution of them.

I am thinking about taking another shot at an APOD.  Let me know if you think I have a chance.

TAC Imaging / 2015 Eclipse from Svalbard Norway
« on: April 07, 2015, 07:54:59 AM »
I posted my pictures of the 2015 eclipse on my website at

For the moment only the eclipse is there.  I will be hosting additional pages for the rest of the trip within about 2 weeks.  I won’t bother you with a second announcement (unless you want).

TAC Imaging / Heart and Soul Nebulas in SHO
« on: March 01, 2015, 08:56:13 AM »
I finished processing my other fall project the Heart and Soul Nebulas.

The processing was heavily influenced by what I learned in the Katonah Pixi workshop and on IP4P.  I included some processing notes at the end of the page.

TAC Imaging / Sharpless (H alpha) Areas in Cassiopeia and Cepheus
« on: December 16, 2014, 03:14:14 PM »
During the rainy days last week I completed my other summer project, mapping the Sharpless areas of Cassiopeia and Cepheus.  This mosaic covers about 16x8 degree starting with just east of M52/Bubble and extending west to the border with Cygnus.  The full resolution image is presented as a zoomable panorama so one can see an overview and then zoom in to see details.

TAC Imaging / Re: M16 and M17 in Narrowband
« on: November 24, 2014, 07:05:25 PM »
From here narrowband is the only way to get really good images.

TAC Imaging / M16 and M17 in Narrowband
« on: November 24, 2014, 04:24:41 PM »
I actually finished data collection on this project in July, but I attended a course in Katonah, NY right after Labor Day.  There I learned a number of techniques to fix some of the problems that occur in narrowband images.  Thanks to life happening it took a couple of more months until I could finish all of the processing, but the final images are now available.

Pay particular attention to the star colors, and to the weaker regions.  Some of the things I learned was how to create masks to fix the star shapes and colors, how to manage the saturation to make the images stand out more, and how to bring out more detail in the midtowns.

As always comments welcome

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