Kodak DCS600 manual Guide number, Histogram

Guide number

The guide number indicates the power of a flash in relation to ISO. Guide numbers, quoted in either meters or feet, are used to calculate the f/stop for correct exposure as follows:

guide number

f/stop = ———————————

flash-to-subject distance

Using a selected aperture, we can calculate the required flash-to-subject distance with the formula:

guide number

flash-to-subject distance = ———————

f/stop

Useful for determining the maximum flash-to-subject distance for flash photography.

Histogram

The image histogram shows the range and distribution of tonal values for an image. The histogram displays the number of occurrences of each pixel code value, and can be used to assess an image's brightness and contrast levels. Pixel code values represent the relative value of light intensities in a scene. They range from 0 (darkest elements in a scene) to 255 (brightest elements in a scene). For a high contrast image, the histogram will include almost the entire range of pixel code values. For a low contrast image, the histogram will include a small range of pixel code values.

ISO

ISO is the international standard for representing film sensitivity. The higher the number, the greater the sensitivity, and vice versa. For example, ISO 200 is twice as sensitive as ISO 100, and half that of ISO 400. When you change the ISO setting on your camera, you adjust the sensitivity of the imager equivalent to the corresponding film sensitivity.

LCD

Liquid Crystal Display. Your camera has four: the Top Status LCD panel, Back Status LCD panel, Image LCD panel, and the LCD inside the viewfinder.

D-4