| PrAcTIcE PhoTogrAPhy | Practice management
range). Depth of field is affected by the aperture, subject distance, focal length, and film or sensor format. The smaller the aperture, the greater the depth of field, meaning that objects within a certain range behind or in front of the main focus point will appear sharp3
.
Focal length The focal length of a lens is defined as the distance in mm from the optical centre of the lens to the focal point, which is located on the sensor or film. The focal length establishes the field of view. The longer the focal length, the narrower and more compressed the field of view becomes; the shorter the focal length, the larger the field of view becomes4
. camera lenses are categorised by
normal, telephoto, and wide angle, according to the focal length and film size.
Single lens reflex (SLR) A camera in which a system of mirrors shows the user the image precisely as the lens renders it. This is the recommended camera type to use for patient photography.
Through the lens (TTL) This refers to a metering system in which a light-sensitive mechanism within
Photography sets the foundation
for how your work will be evaluated and presented. setting high standards in photography and using existing protocols will ensure that your talent is properly represented.
the camera body measures exposure from the image light passing through the lens.
ISO how sensitive the camera’s sensor is to the amount of light falling on it. raising the ISo of a camera makes the sensor more sensitive to light. This can be useful when photographing in low light situations where you do not want to use a flash.
Digital camera modes and what they represent Digital cameras offer many shooting modes for photographing in a range of settings. Professional digital single lens reflex (DSLr) cameras primarily have the basic modes, while consumer digital cameras may offer some of the basics, but also include some predetermined
settings that are represented by icons. Some of these modes may or may not be useful for patient photography.
Aperture priority Aperture priority mode is generally represented by an AV or A depending on the camera. This is the preferred mode for photographing patients. This allows the user to choose the aperture and the camera selects the shutter speed to accommodate correct exposure. It is important to have a small aperture when photographing patients because you want all areas to be in focus.
Shutter priority mode Shutter priority mode is represented by TV or S. This mode allows users to choose the shutter speed. This mode would be important if you were trying to capture a fast moving object without blur, but is typically not used in patient photography.
Manual mode Manual mode is represented by an M. Manual mode allows the user to choose both the shutter and aperture. This is the preferred method when photographing with studio lights in a clinical setting as it provides complete control over the exposure.
prime-journal.com | July 2011 ❚ 71
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