Monthly Archives: May 2013
Memorial Day weekend was very productive for me. A couple weeks ago I purchased my first DSLR camera, a Nikon D3100 and I’ve been itching to start photographing the night sky. My first big target was the planetary alignment of Venus, Jupiter, and Mercury over the weekend which did not disappoint. I was able to shoot the planets on both Saturday and Sunday nights under perfectly clear skies. This was a relatively easy target for my first foray into the world of astrophotography.
On Saturday night I took my camera and tripod up to my dark sky site in Fawn Grove, Pennsylvania. I arrived around 8:30 just as the sun was setting. While darkness was gathering I set up the camera and punched in the initial settings and waited for Jupiter to appear. Venus was already brilliant approximately ten degrees above the horizon by 8:45. Jupiter appeared minutes later, followed by Mercury visible to the naked eye around 9:00. I played with the aperture and shutter speed until I captured an image I really liked. I ended up with a focal ratio of f/8 and a 1.6 second exposure at ISO 100. The final result once I played with it in Photoshop was very nice, as far as my inexperienced self is concerned. That’s Venus at the bottom of the triangle, Jupiter at upper left, and tiny Mercury at upper right.
This was just practice for Sunday of course. Sunday’s alignment was the one that captured everyone’s attention. The almost equilateral triangle of planets is something you won’t easily forget if you saw it for yourself. If you missed it you’re in luck because photographers all over the world captured the stunning alignment. I’m relatively happy with how mine came out. The only drawback is that the planets are slightly out of focus. I should have been paying closer attention to that. However, them being out of focus kind of allowed more color to come out, especially in Mercury. I worked with the same camera settings as Saturday night. After some adjustments in Photoshop this was my final result.
After the planetary imaging session I was feeling lucky so I tried my hand at some wide-angle constellation shots. I turned the camera towards Ursa Major and took 200×10″ frames and went to stack them in Deep Sky Stacker only to find that my images were out of focus and DSS couldn’t recognize any stars. Not so lucky I guess. I was determined to get it right so I went back outside around 11:30 and decided to shoot the constellation Lyra and it’s bright star Vega. This time I took 200×1.6″ frames at f/4, ISO 3200 and went in to stack them in DSS. The result was much, much better. About 2 hours later I had a decent image with which to work with. I gave it several editing passes in Photoshop before I produced an image I was happy with. Not only are all five of Lyra’s main stars visible, the double star Epsilon Lyrae showed up which really made me proud. This is my first constellation shot so I guess it’s the small things that bring me joy.
Overall, it was a very productive weekend. I learned a lot about how important it is to really nail the focus before shooting anything. Trial and error is how you improve in this hobby. I’m hoping to get a few more practice shots under my belt before taking the camera up to Cherry Springs State Park in a week and a half to shoot under a real dark sky. As I produce more images I will post them here so I hope you stick around and if you have any suggestions or critiques to help improve my technique I’d gladly appreciate it.
I think it’s a safe assumption to say that whenever anyone gets into astronomy their greatest desire is to be able to take pictures of what they observe. The saying that a picture is worth a thousand words is certainly true of astrophotography. There is certainly a great joy in observing the universe with your own eyes at the eyepiece and that should unequivocally be any amateur’s first love. Given the mass-availability of photography equipment and astro-imaging software and techniques it is no surprise that astrophotography has risen to such popularity in the 21st century. All someone has to do is watch a couple of tutorial videos on YouTube and you have a pretty good sense of what equipment and software you need and it’s easy to practice the techniques employed by more experienced photographers.
I’ve decided to jump on the astrophotography train myself. Mind you, I don’t own a fancy equatorial mount for my telescope or even a DSLR camera for that matter so I have to try a slightly different method to get images. By far the best and easiest way to do astrophotography with a Dobsonian mounted telescope is with a webcam. This method is really only useful for planets, the moon, and sun given that images of deep-sky objects requires long exposures that would produce star trails if not tracked. However, it was extremely rewarding producing my first planetary image.
I’m not going to go into detail on how I captured my images because that would just be an incredibly long post. Instead, I just want to share the equipment and software I used to give you a sense of how easy (and inexpensive) it is.
My telescope is an Orion XT10i Dobsonian which already provides very nice planetary images in the eyepiece. Images are always sharp and bright when in focus. For this experiment I purchased a Microsoft HD Lifecam from my nearby Staples office supply store. I went with the Lifecam because it has a body that is perfectly designed to fit inside any 1.25″ focuser tube. The Lifecam can also shoot 1280×720 720p video at 30 fps (after some tinkering) which is something special for a webcam. I followed the instructions provided by Gary Honis, who is the authority on all things webcam photography related, on his website, found here. I didn’t use the 1.25″ barrel extenders like he did, rather I used a film canister. The film canister seems to work just fine and it fits snugly into the focuser.
To capture the video I downloaded a piece of software called AMCap which is freeware video capture. It’s available for a free download but a donation is asked for, but not required. Also, a jpeg video codec is needed to capture the raw video in .avi format. Any jpeg codec you can find will probably work but Gary recommends a particular one on his software tests page. Finally, I used Registax 6 to stack the images from the raw .avi video and touched it up a bit in Photoshop CS6 an voila! a nice, crisp, clean image of Saturn.
This method is very easy to do for anyone without a tracking mount and what’s best is that it only cost me $35 plus shipping and handling. If you have a Dobsonian telescope this method is definitely for you.