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Part I

Using the Nikon D90

pattern. (Dr. Bryce Bayer was a scientist at

Kodak who developed this pattern.) The

Bayer pattern lays the ﬁ lters out in an array

that consists of 50% green, 25% blue, and

25% red. The green ﬁ lters are luminance-

sensitive (brightness) elements, and the red

and blue ﬁ lters are chrominance-sensitive

(color) elements. Twice as many green ﬁ lters

are used to simulate human eyesight, given

that our eyes are more sensitive to green

than to red or blue.

The camera determines the colors in the

image by a process called demosaicing. In

demosaicing, the camera interpolates the

red, green, and blue data for each pixel by

using information from adjacent pixels.

Interpolation is a mathematical process in

which sets of known data are used to deter-

mine new data points. (I like to call it an

educated guess.)

When shooting NEF ﬁ les, the RAW

converter handles the demosaicing.

Viewﬁ nder Display

When looking through the viewﬁ nder, you

see a lot of useful information about the

photo you're composing. Most of the infor-

mation is also displayed in the LCD screen

on the top of the camera, but it's less handy

on top when you're composing a shot.

Here's a complete list of all the information

you get from the viewﬁ nder display:

Focus points. The ﬁ rst thing you're

likely to notice when looking

through the viewﬁ nder is a small

bracket near the center of the frame.

This is your active focus point. Note

that the focus point is only shown

full-time when in the Single or

Dynamic AF setting. When the cam-

era is set to Auto Area AF, the focus

point isn't shown until the Shutter

Release button is half-pressed and

focus is achieved.

Framing grid. When this option is

turned on in the Custom Setting

menu (CSM d2), you see a grid dis-

played in the viewing area. This is

to help with composition. Use the

grid to help line up elements of

your composition to ensure that

things are straight (or not).

8mm [center-weighted] reference

circle. These curves located at the

top and bottom of the AF Area

brackets give you an idea of how

much of an area of the frame is

used for Center-weighted metering.

The curves show you an area of

8mm, which is the default circle

size for Center-weighted metering.

Note that although you can change

the size of the area for Center-

weighted metering (CSM b3), this

display doesn't change.

Black and White indicator. This

icon appears when the Picture

Control is set to monochrome (MC).

For more on Picture Controls, see

Chapter 2.

Battery indicator. This icon

appears when the battery charge is

getting low. When this icon is blink-

ing, the battery has been depleted

and you can't take any more pic-

tures until the battery has been

charged and replaced or a charged

backup battery is installed.