Pentax IST DS2 - Manual (Page 14)

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Camera Characteristics
• Features a 23.5×15.7 mm CCD with 6.1 million effective pixels for high
precision and a wide dynamic range.
• Features an AF sensor with 11 focusing points. The central 9 are wide
cross area sensors.
• Improved manual focusing using a viewfinder similar to a conventional
35 mm SLR camera, with 0.95× magnification. Also features a
superimpose function in which the focus points on the viewfinder
illuminate red.
• Uses CR-V3, AA lithium batteries, rechargeable AA Ni-MH batteries or
AA alkaline batteries.
• Features a large 2.5-inch LCD monitor with 210,000 pixels and a
brightness adjusting function for high-precision viewing performance.
• Concepts of Universal Design have been implemented to various parts
of the camera. The large, high-resolution LCD monitor and easy-to-use
menus make the camera easier to operate.
The captured area (view angle) will differ between the U and 35 mm
SLR cameras even if the same lens is used because the format size for 35 mm
film and CCD are different.
Sizes for 35 mm film and CCD
35 mm film : 36×24 mm
U CCD : 23.5×15.7 mm
Angles of view being equal, the focal length of a lens used with a 35 mm camera
must be approximately 1.5 times longer than that of U. To obtain a focal
length framing the same area, divide the focal length of the 35 mm lens by 1.5.
Example) To capture the same image as a 150 mm lens attached to a 35 mm
camera
150÷1.5=100
Use a 100 mm lens with the U.
Inversely, multiply the focal length of the lens used with U by 1.5 to
determine the focal length for 35 mm cameras.
Example) If 300 mm lens is used with U
300×1.5=450
Focal length is equivalent to 450 mm lens on a 35 mm camera.