Horsehead: A refinement in processing

With some time to process, I have dug into the Horsehead and astronomical workflow to find the best approach. My main efforts are built around noise reduction and determining at what point to apply noise reduction software. The choices are to apply in RAW conversion in LR or to wait and use a PS plugin or 3rd party independent software. I have previously used Noise Ninja after the image is nearly complete, but was recently introduced to Noiseware. I am using the Pro version of Noiseware as a PS plugin. The main advantage to Noiseware is that I can use it in my normal workflow within PS and can use color profiles effectively. Noise Ninja did not work well with color profiles as an independent app. Noiseware has numerous controls, too numerous to mention here, for controlling how and where the noise reduction is to be applied. My thoughts are that it might be best to add some noise reduction in the RAW file in LR and then utilize Noiseware late in the processing stage. This particular image had no noise reduction applied in LR. I am going to rework the Horsehead image with that approach and will report back with results. One thing I love about astronomical photographs is that they are so difficult to work with that it makes landscape optimization so much easier. Take care and check out Noiseware if you get a chance on some really noisy images.

One other change in workflow with this image involved applying a flat field from the RAW camera files to the image in PS. This worked very well and is now a part of my workflow. I found no advantage to applying dark frames to the image. I believe dark frames are largely a waste with the Canon 450D and that simply increasing the amount of signal is the best way to maximize the signal to noise ratio.

Comet Lulin

Comet Lulin graced North American skies in the winter of 2009. Fortunately, the closest approach was during the Winter Star Party in February. Comet Lulin proved to be much more interesting than I had previously been inclined to believe. The comet brightened dramatically over the week of February 24 and sported a beautiful ion blue tail. I slewed to the comet with the scope and began my initial exposures and was surprised by the views on the LCD screen. The blue ion tail was crumpled and extending away from the comet nucleus in a beautiful fashion. So this object became the main target object during the 2-4 a.m. imaging window on most nights. More information on the comet can be found by clicking on the title of the blog at NASA's website. You may also click on the image for a larger presentation.

This particular image was taken during the 2 a.m. hour of February 21, 2009. It is a composite of 9 exposures of 3.5 minutes each at ISO 1600 on the Canon 450D through the TMB 92SS refractor. Comet imaging poses additional challenges when the comet is fast moving such as Comet Lulin. The imager must combine several short exposures for the background sky as well as for the comet. So two iterations of stacking are needed since the comet is moving relative to the fixed star field. This is quite challenging in processing, but we do have techniques that allow us to accomplish this with nice results.

All of the processing was accomplished with Adobe Light Room 2.0 and PS3 with some Noise Ninja for noise reduction. Images were aligned and stacked with Images Plus. A Sigma median combine was used on the comet nucleus to achieve a reduction in star trails and isolate the comet nucleus and tail in the combination. The total exposure time is approximately 30 minutes. I am also going to present a movie which depicts the comet moving relative to the star field. I hope you enjoy the image and please check out the NASA link for more information on the comet.

An Orion experiment

Now this is simply crazy. I had some Orion Nebula data from WSP that I basically captured on a whim. So in reviewing the data in Light Room I wanted to see just what the new techniques could bring out of this data. Let me state up front that this is simply not enough data to get what I eventually want out of this image. But, it is a great exercise in seeing exactly what the technique can do with very limited amounts of data. I selected 11 of the best frames captured on the Canon 450D and TMB 92SS combination. I optimized each image in LR 2.2 and exported to tiff. I used Images Plus and Sigma clip for the alignment and combination and then processed as normal in PS3. Now one other major error on my part, not that the clouds at WSP had anything to do with it, was that I failed to capture shorter exposures to compensate for the over-exposed core of M42. So I did plug in some old data from other instruments for the core of M42 in this image. There is a fair amount of noise reduction via Noise Ninja applied to the shadow areas. So for only 40 minutes of data with a lowly DSLR, I am very happy with the potential to really capture the Orion Nebula area as I hope next year. My expectations are that two hours of data at ISO 800 will be wonderful data to work with and accomplish my imaging goals. Please drop me a line if you have any questions or comments and I hope you enjoy the image.

Rosette Nebula from Winter Star Party

The Rosette Nebula (please click on image for larger presentation) is approximately 5500 light years from Earth and spans over 1 degree in the sky which is more than 5 full moons. The nebula itself has different NGC designations including 2223, 2238, 2239, and 2246. The open star cluster in the middle of the nebula is designated as NGC 2244. The nebula is located in the constellation Monoceros.

This image is another in my continuing experimentation with using Adobe Light Room and Photoshop exclusively in post-processing. I actually selected only 11 of the best images I had for this object taken during the Winter Star Party in February 2009. The 11 images were each 3.5 minutes in exposure at ISO 1600 for a total exposure time of 40 minutes. ISO 1600 was used as a compromise to maximize exposure time due to the sporadic cloudiness that was present. The telescope used was a Tom Back 92mm signature series refractor at approximately f4 and a focal length of about 400mm. The camera used was a modified Canon 450D. So far, I am very happy with the results of the Adobe processing work flow. The only question that I have is how well with this process work on hydrogen alpha images. I hope to do some experimentation with this in the coming weeks. I hope you enjoy the image and please drop me a line if you get a chance.

A Night at the Winter Star Party

While at the Winter Star Party in February, I imaged with multiple cameras through the night. The primary camera was on the telescope with a secondary wide angle camera on the G11 mount and a third camera for night landscape from a tripod. One of the techniques I wanted to experiment with was a time-lapse of our imaging area with a star field for the entire night. My first results of this can be found on my Vimeo page linked below. A higher quality video is available for download from the Vimeo webpage for Vimeo members. Registration is simple and takes only a few seconds.

I really hope to explore this technique more fully over the coming months and to incorporate the results in a more comprehensive artistic output. I hope you enjoy the video and there is more information on the Vimeo webpage. I am also experimenting with the video capabilities of the 5D Mark II and will update the blog with results from that soon. Thanks and take care...

A Night at the Winter Star Party 2009

The Globular Cluster of Stars

What contains over 5 million solar masses, has about the same mass of the smallest whole galaxies, and is the second brightest globular cluster in the local group of galaxies? The globular cluster known as Omega Centauri or NGC 5139 is the answer. This image was captured along the beaches of the Florida Keys during the Winter Star Party in February. (Please click on the image for a larger presentation.)

The image was taken with a relatively short focal length telescope at 400mm. This view is very close to approximating the view through a nice pair of astronomical binoculars. That is my favorite way to view this object as the sparkling cluster shimmers against a backdrop of dark space. For more information on the object please see
http://messier.obspm.fr/xtra/ngc/n5139.html.

The image information is: captured with a modified Canon 450D, 11 frames of 3.5 minutes each at ISO 1600 on a TMB 92mm telescope at f5. The mount used was an Astro-Physics 400GOTO. All processing in Adobe Lightroom and Photoshop. Please contact me if you have any further questions and I hope you enjoy the image.

If you are ever at a southern location in northern hemisphere winter, please do yourself a favor and gaze through a pair of binoculars at this heavenly site.

Horsehead Nebula from Winter Star Party 2009

Hello again,
I have completely changed the way I am processing astrophotos. I am no longer utilizing frame calibrations such as dark frame subtraction, flat fields, and bias frame subtraction. The reason? I felt that the images were pretty clean to begin with and that the camera manufacturers and Adobe LightRoom had better RAW image processing algorithms than any independent software manufacturer. I also know Adobe Light Room and Photoshop intimately and I am in control of the entire image processing chain at every step. So my first effort with this new approach is the Horsehead Nebula region in Orion taken at the Winter Star Party in February 2009 (please click on the image for a larger version.} The image is a composite of 5 frames at ISO 800 and 15 frames at ISO 1600 at 7 minutes and 3.5 minutes, respectively. The scope used was a Tom Back 92mm at approximately 400mm focal length and f5. The camera is a modified Canon 450D. I hope you enjoy the image. I will be posting more on my new processing as I work through other images from the trip. Take care and drop me a line.