Digital recording media

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With digital recording media, things are a little different, because here the objects do not have fixed sizes but only a certain number of pixels. The resolution of the output device assigns the objects their size. With this knowledge, we can calculate the image scale as follows (formula 13):

β = image scale 
P = number of pixels of the image 
A = resolution of the output device in pixels per unit length 
G = size of the captured object in the unit of length of A

Thus, if an image has 200 pixels, the monitor has a resolution of 100 pixels per inch (PPI) (1 inch = 2.54 cm = 100/2.54 = 39.4 pixels per cm), and the object size is 2.5 cm, the image scale is (formula 14):

Can we get a wider field of view with a 24 mm wide-angle lens by moving away from the landscape in front of us? – Many photographers make this mistake in thinking, confusing the effect of shooting distance with the angle of view obtained by the lens. Of course, from a wider distance, the image reveals more detail, and we say „there’s more ‚on it'“. Nevertheless, the captured angle of view remains constant because it is determined by the focal length of the lens and its relationship to the image format.

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