Nikon D200 Manual de operação - Página 13

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Lens Focal Length

The 28mm to 105 mm lens furnished with the Nikon D200 covers a wide range of

photographic requirements, from wide angle to long-telephoto. Focal length settings less

than 50 mm are not useful when the camera is used in a Cessna 182 or Cessna 172

equipped with a photo window. Taking photos at focal length

settings from 18mm to approximately 40mm results in the picture

including parts of the aircraft (landing gear, wing). Customers do

not want parts of the aircraft in the photo. In addition, when parts

of the aircraft are in the photo field, the camera's automatic focus

and exposure devices may not work correctly; the landing gear

may be in focus but the scene below may not!

Focal length is set by rotating the focal length ring.

Focal length setting

Choosing the best camera Pointing Angle and lens Focal Length

Consult the following table to select shooting parameters. Data is given for an aircraft

altitude of 1200 feet AGL. The data can be scaled for other altitudes as the scaling is

linear. Example, to fly at 1800 feet AGL, multiply the number in the rows "Horizontal

Image dimension in direction of flight" and below by 1800/1200 = 1.5.

Base upon the customer's requirement for image size at ground level, go down the table

and find the closest fit. For example, if the customer wants each photo to be about 800

feet by 600 feet, choose the first data column; 812 feet horizontal and 847 feet

perpendicular to the direction of flight is a close fit. From that column, find the required

lens focal length (50 mm) and camera pointing angle (45 degrees). The bottom data entry

in the column indicates that the aircraft will need to be directed to a point 1200 feet from

the target. Resolution at the center of the photo will be 2.3 inches!

Important – Most of the data in the table applies to both the Nikon D90 and Nikon D200

cameras. Resolution values are for the D90; numbers will be reduced slightly for the D200. For

other cameras, the data may be way off as other cameras may have different image sensor

dimensions.