Rock Stars: 24 Hours In Joshua Tree Following The Stars, 28 April 2012 - Extra Photos
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Why would anyone go through so much trouble to stack photos? Noise is the enemy of night photography. Keeping your shutter open for long periods of time is more likely to introduce noise. Stacking photos was originally developed as a technique in digital astrophotography to reduce noise, but of course, as more artistic photographers can use this technique too. The final photo, all together, is a 40-minute exposure. If I had left the camera open for 40 minutes, I would have gotten a lot of noise (grain), and the sensor would have heated up, coloring the stars. With my Nikon D90, I find that if I begin approaching 20 or 30 minutes, I begin getting more artifacts, and would have gotten more so since it was a relatively warm night. The red line on the left side is an airplane. In the final photo, I chose to leave it in because I thought it added some character. Since I had 80 photos, I could have easily taken it out. The foreground in a couple of other photos had the foreground illuminated. I liked that. In fact, that's why I had set up here. So I left them in, using Photoshop to blend the amount of illumination in to my liking. I like having that sort of artistic control, which is why I used Photoshop to stack the photos instead of one of the freeware versions that don't appear to offer as much control.
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In this final photo, eighty photos were combined to combine this photo, a 40-minute exposure showing nature's celestial movements facing north. The faint almost horizontal red line on the left side is an airplane. The faint white dots on the far right hand side is a falling star. I initially took them out, then decided I'd leave them in and give the photo a little patina. :D The foreground was "light painted" by the ambient light from a couple of passing vehicles. I picked a location far enough from the road so cars wouldn't shine their headlights on my foreground too brightly. I ended up choosing a place that was up a small hill from the road which captured a small bit of ambient light from the headlights but wasn't harsh, allowing this ambient light to "light paint" the foreground in a nice, even manner. There was also a partial moon out, and I wanted to make sure that the camera wasn't facing near the moon, which can obscure the stars. I hope this was helpful. |
Ken's photos of Nobel Peace Prize Winner Aung
San Suu Kyi, as well as photos of Peru, Burma, India, Morocco, China, Thailand,
Ghana, Ecuador, and elsewhere, have appeared in many books, magazines,
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Rock Stars: 24 Hours in Joshua Tree Following the Stars
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