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Low Light Photography
By Alex Tabony
Taking good pictures in low light can be achieved in a number of ways. To maintain a proper exposure you may need to increase aperture, reduce shutter speed, use higher ISO or use a flash just as with a film camera. However with digital photography there are additional considerations.
Increasing aperture (lower F-numbers) opens the lens' internal blades that restrict light from entering the camera. By letting more light in, you can obtain a good exposure while keeping other camera settings the same. The two issues to consider when using a reduced f-number, is the reduction of depth of field and that most lenses do not perform as well at their widest apertures.
Lowering shutter speed without making other adjustments can also help in getting the proper exposure. The rule of thumb is to set shutter time to no less than the focal length of your lens. So if you are using a 50mm lens, you should generally try to keep the shutter speed above 1/50 of a second. This will help prevent blurring the image due to camera shake (tripod can help).
Camera shake and the blurring of images is always a problem when using long shutter times. At longer focal lengths this issue is even more of a problem. Wildlife photographers, sport shooters and reporters often struggle with creating good images in less than ideal lighting. Even taking pictures of children indoors can result in motion blur.
Fortunately modern image stabilization systems (IS) are available from all major camera manufactures. Currently there are two methods for implementing image stabilization. The first is a system built into the camera body (Sony, Pentax and Olympus) which actually moves the sensor to counter camera movement. The second type is an in-lens system (Canon and Nikon) that move internal parts of the lens to reduce blurring of images. Which system is better is a matter of Internet e-arguments that will probably never reach
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a conclusion. In either case IS significantly reduce problems due to camera shake during shooting.
Increasing ISO increases the camera’s sensitivity to light. So a higher ISO will allow you to use higher shutter speeds and/or smaller apertures in the same lighting conditions. These changes can be helpful for achieving the image you desire by controlling depth of field and reducing motion blur.
In the days of film this was done by using high ISO film. In the digital era all you need to do is locate the ISO adjustment on the camera. However, just like high ISO film had problems digital high ISO settings come at the expense of digital noise.
Thankfully recent advances in camera sensors, especially with digital SLR types, allow for very high ISO setting with relatively low noise. Improvements in noise reduction software have also made extremely high ISO photography viable. Recent advanced amateur level cameras from Nikon and Sony allow for ISO setting of up to 6400 and one of the professional Nikon dSLR is usable up to ISO 25600!
Advances in dSLRs have made flashless low light shooting much easier than it once was. High ISO performance and image stabilization systems are rapidly developing. The cameras that are available today are very good but you need to do your homework before you buy. If you are not yet invested in one systems lenses you have a lot of excellent options, but don’t sell yourself short buy picking up an out of date camera body unless you know what you are giving up by saving some money. Article Source: Article Beam - a service of A1 Web Server Web Hosting You can learn more about digital cameras by taking a look at the articles at dSLR Camera Shop.
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