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Posts Tagged ‘photography’

Longer Exposures For More Saturation and Luminosity

Monday, October 6th, 2008

In situations involving low levels of light it can often be beneficial to obtain a longer exposure to allow the sensor/film more time to absorb color and glow. There can be a lot of color and light bouncing off clouds and hills that our eyes can’t pick up. Cameras are able to “see” into low light scenes by leaving the shutter open and collecting more light. If I really want to pull as much light and color from a scene as possible I’ll often use a neutral density filter (ND) along with my usual filter stack (polarizer and graduated neutral density when needed) and also set the ISO on my camera down to 50 in order to extend what was already going to be a long shutter speed.

A neutral density filter is a neutral gray piece of glass or plastic that is placed in front of the lens. Since it is neutral it doesn’t change the color of the image or do any other special effects. All it does is reduce the amount of light that can pass through the lens to the image sensor or film (kind of like wearing color neutral sunglasses). By reducing the amount of light coming in, the exposure time needs to be longer to get a properly exposed image. One effect of longer exposure times is the blurring of anything moving within the image (water, clouds, wind blown trees, etc.). Another affect is that if there is low level colored light washing over the scene it will saturate in the image over time. I use Singh-Ray neutral density filters because they are some of the most color neutral filters available and give excellent results. I also use Singh-Ray Graduated Neutral Density (GND) filters. GND filters are neutral gray at the top and fade to clear near the middle. They are used to hold back the light in one part of an image (like a bright sky) in order to balance the light across the scene.

The two photos above were taken one right after the other, the first at 6 sec @ f/20, ISO 100 with a 3 stop GND for the sky. The second was taken at 30 sec @ f/20, ISO 50 with a 3 stop GND and a 3 stop ND. Quite a difference 24 seconds of shutter time can make.

Tags: digital photography, exposure, filters, graduated neutral density, help, light, long exposure, neutral density filters, photography, pointers, saturation, singh-ray filters, techniques, tip, tips, tutorial
Posted in Digital Photography Tips, Photography Journal | 1 Comment »

Photo Tip: The Difference Light Makes

Monday, August 18th, 2008

Photography is all about light. Without it, no photo. However it goes far beyond that. The type, direction, color, amount and quality of light, as well as the photographer’s ability to see and manage the light, are serious contributors to the success of a photo. The ability to see, feel and anticipate light as well as know how the camera will capture light are skills that take a long time to acquire. Some light is right for some scenes but completely wrong for others. The best way to learn what works and what doesn’t is to get out and shoot in all lighting conditions and stick around to shoot the same subject as light is changing, all the while making special note of how the light looks to the eye.

Sometimes it is difficult to know by eye just how much impact the light going to have on a photograph. The best way to realize the impact of light is to compare photos of the same subject matter under different lighting. The following two photographs really illustrate the value of such an exercise. These photos were taken less than two minutes apart, one before the sun rose over the horizon and the second, just after. There are times when the soft glowing light that comes just before sunrise gives perfect even, luminescent lighting to a scene, picking up subtle details and working its way into the deepest shadows. However, in this case, there isn’t enough separation of elements or correctly angled surfaces in the scene. The even lighting causes the tree, rocks and mountains to appear muddy and not well defined and the sky washes out to an unattractive white.

What a difference a little time makes. In the second image, just a few seconds later, bright, warm, low angle direct sunlight has broken over the horizon, side lighting the scene. It brings out color and adds needed definition and depth to the image, all things the eye looks for. In addition, the direct sunlight coming in at 90 degrees to the camera lens allow for the best polarization effect from a circular polarizer, enhancing the color of the tree and rocks and helping to darken the blue sky.

The composition itself isn’t particularly interesting, but the addition of the right light can make a surprising difference in how appealing it is to the eye. This is a great example of a particular type of light enhancing an image. Unfortunately, it isn’t a perfect formula for success and you shouldn’t try to achieve the same type of lighting for every image you take. In another situation you might find that the pre sunrise light actually creates the most appealing image.

It all comes down to time spent shooting in all lighting conditions, becoming more familiar with what works and increasing your chances of being there when the light is right.

Tags: landscape photography, light, outdoor photography, photography, photography technique
Posted in Digital Photography Tips, Photography Journal | No Comments »