Meeting Photo Challenges
Creative Image Processing
Nature & Outdoor
Creating Better Photographics
Night & Low Light Photography
Light & Exposure
Close-Up & Macro
Digital Black & White
Color & Design
Choosing & Using Lenses
Digital Photography Equipment
Low Light Special Effects: Unique Photo Ops
Low light photography presents many challenges, but like any challenging situation it also opens up opportunities to create unique images. Think outside the box and you will be surprised at the kind of images you can produce. The techniques I describe below will get you started. Try each one and see why there is no limit to what you can create with some imagination and effort, and have some fun in the bargain.
Painting With Light
Take for example, the row of first century B.C. megalithic heads on Mt. Nemrut in Turkey (#1). This is a 30 second exposure at dawn and during that time I walked down the row of heads holding a Brinkmann (www.brinkmann.net) Maxfire Dual Xenon Spotlight (see page 8) shining the light on the ancient sculptures as I moved toward the camera. I chose this particular high intensity light because it’s very light for traveling and it’s inexpensive. During the long exposure, I “painted” the heads with light. I decided to move from the farthest head to the camera position so I could light them from behind and from the side (from the camera’s point of view) to create interest, artistry, texture and dimension. Had I lit them from the front, they would appear much flatter and they wouldn’t look as good. (But something always happens—notice the last head in the row. It is blurred and that’s because the person in my photo tour who opened the shutter for me accidentally bumped the tripod during the beginning of the exposure.)
I chose the lens aperture based on test shots. This was a situation where a meter was useless because the exact amount of time I painted the heads with light varied every time I made a shot. The best I could do was to take a few initial exposures to see what f/stop offered me the best exposure. I wanted a decent amount of depth of field so all of the sculptures were sharp, so I raised the ISO to 640 and that enabled me to use a lens aperture of f/9. I was with a photo tour group, so I told everyone how to set their cameras for the best results. I was racing against time because the sky was getting light, and an exposure that let in too much light would blow out the detail in the background. After every shot I quickly looked at the LCD monitor to make sure all of our exposures were right on.
I also painted a single head with the Brinkmann light (#2). Notice that I also chose side lighting for a more dramatic image. Also note that I didn’t stand at the camera position and hold the light at arm’s length. You can tell from the angle of the light that it was coming from the left side at about an 80˚ angle. Because the shutter was open for 10 seconds, this gave me enough time to move into position to obtain the kind of angle I wanted. I lowered the ISO to 250 in this case because I had more time to devote to a single subject—as opposed to the entire row of heads—and the f/8 aperture gave me a good exposure on the dawn sky plus the correct exposure on the head. I felt it was important to show the cobalt blue color in the background as opposed to letting it go black. I wanted the definition in the headless bodies in the background (the heads fell off the bodies due to earthquakes).
You don’t have to go to exotic locations to use this technique. In (#3), I painted some flowers in my home with a flashlight. I closed the door and turned off the light to give me a dark environment and I used a 50mm macro lens for the shot set to f/27. I wanted complete depth of field, but I had no idea what the exposure time should be.
The exposure is dependent on the intensity of the light, the distance of the light to the subject, the ISO and the lens aperture. I chose ISO 100 and a small aperture, and then I had to experiment with exposure time. I did a few test shots and then settled on 10 seconds. I basically dabbed the flowers with the light. There was no rhyme or reason to how I lit them—I just played. After several exposures I decided this image was the best. You can see that some of the petals are backlit and some are side lit because I was moving the light around the flowers, experimenting as I went. If you look closely at the bottom of the picture, you can see that a few of the petals have a double image. That occurred because the flashlight bumped the flowers during the exposure, which to me added to the charm of the image.
When I photographed a marble Buddha that I’d purchased in India many years ago (#4), I used the tungsten white balance setting on my camera because the bulb inside the flashlight was tungsten. This corrected the yellow color perfectly. Assuming you want correct colors, I don’t recommend using auto white balance when shooting with tungsten light sources because the image will turn out too yellowish. I used a 10-second exposure for this picture. This gives you enough time to be creative with painting the subject with light. Unless you want ambient light to be a factor in the final result, shoot in a darkened room with a low ISO and a small aperture. The only light you’ll record is from the flashlight.
Creating A Star Field
You can see examples of how I used this image in (#6, #7, and #8).
Stacking Images To Eliminate Noise
The photo you see here of an otherworldly landscape in Namibia (#9)—a quiver tree forest—was taken at sunset. I was leading a photo tour to this African country and on this particular evening we had an incredibly dramatic sky. I then combined the landscape with a shot of the night sky (#10), that I took the next evening at Sossusvlei where the largest sand dunes in the world are located. The sky was as crystal clear and stunning as I had ever seen. It seemed like I could touch the Milky Way. To photograph the stars as clear as you see here required some careful planning. I didn’t want star trails; I wanted to capture what I saw. I then used Photoshop to get rid of the unwanted noise from the high ISO I was forced to use. Let me explain.
For the picture of the stars, I wanted a long exposure to accumulate the light so the sky looked even brighter than it does to our eyes. However, a long exposure would create star trails due to the rotation of the Earth. I didn’t want that. Therefore, I limited the exposure time to 10 seconds. A longer exposure would show the beginning of the star trails in the form of oblong stars and that wouldn’t look good. Actually, 10 seconds is slightly too long, 5 seconds would have been a better exposure so each of the stars was a round pinpoint of light. To keep the ISO from becoming unacceptably high, I stuck with a 10-second exposure (as it turned out, I could have raised the ISO without any worries).
I used a 50mm f/1.4 lens to gather as much light as possible during the exposure, and I raised the ISO to 1600. That’s why the sky is as bright as it is in this image.
In order to eliminate the noise, the first step was to take 10 separate shots of the sky, obviously from a tripod, and all in Raw mode. It was important not to bump or jar the tripod in any way during these exposures. Yes, the stars move quite a bit in the time it took to shoot all 10 pictures, but that didn’t matter because the software took care of that issue.
In Adobe Camera Raw, I opened all of the images and without manipulation I hit “Open Image”. Now I was in Photoshop. I saved each file as a .psd file, and then I used the command File>Scripts>Load Files Into Stack. In the dialog box that opened (Figure A), I checked the 2 boxes at the bottom and then browsed for the 10 exposures of the sky and hit OK.
Finally, I used the pull-down menu command Layers>Smart Objects>Stack Mode>Mean (available only in CS5 Extended). This combined the images in such a way that the noise was completely gone without softening the image. The stars were automatically aligned even though they had moved a noticeable distance in the sky, and the composite photograph was perfect. It was magic!
I then used the Magic Wand tool to select the original sunset sky behind the trees and pasted the stars into the background. To be honest, when I saw these images together I was completely blown away.
Circles Of Confusion
I opt for ISO 200 in these situations and a tripod really isn’t necessary since sharpness is not an issue. I stick with daylight white balance but sometimes I’ll experiment with tungsten white balance for a more bluish look.
In the night shot of Hong Kong (#12), I made an in-camera double exposure. This was taken with a film camera, and although some digital cameras allow you to do double exposures, I’m hoping that in the near future it will be a common feature. One of the pictures was taken in-focus while the other was shot with the entire scene so out of focus that each of the point sources of light became soft colorful spheres. (Note: you can also combine separate images in software as well.)
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