Saturday, August 30, 2008

Olympus Digital SLR Cameras and Lenses-06

Olympus Digital SLR Cameras and Lenses-06

Macro Lenses

Macro lenses let you photograph physically small objects, filling more of the frame with the object. The longer the focal length of the macro lens, the more space you can put between you and your subject. This is especially important when photographing insects. A macro lens that goes down to "1:1" can be used to take a frame-filling photo of something that is 13x17mm in size, the same dimensions as the sensor on a Four Thirds digital body. Most macro lenses can be used for ordinary photographic projects as well, i.e., they will focus out to infinity if desired.

Teleconverters

A teleconverter provides additional magnification, but the overall amount of light gathered by the lens remains the same. Thus, you lose one f-stop of light with a 1.4x converter. The viewfinder will be dimmer and the camera will have a tougher time autofocusing. For autofocus with a 1.4x teleconverter, you generally need an f/4 or faster lens.

Flashes

An in-body pop-up flash can be useful outdoors for filling in harsh shadows. When flash is providing the primary light, you'll need at least one hotshoe TTL flash. A hotshoe flash can be used to bounce light off the ceiling or walls. Often it is best to place the flash at a distance from the camera, then point it at the subject. The Olympus FL-CB02 hot shoe cable may be used to preserve communication between the body and flash or use the built-in wireless flash control of some E-system bodies (currently the E-3 is an example). Unless you want images that look as though the photographer was wearing a headlamp, try to come up with something other than direct on-camera flash.

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