Olympus E-1 E-1 Reference Manual (English) - Page 59

Exposure mode A : Aperture priority shooting The camera sets the optimum shutter speed automatically for the aperture value you have selected. When you decrease the aperture value (F-number), the camera will focus within a shorter range (shallow depth of field) and produce a picture with a blurred background. Conversely, when you increase the aperture value, the camera will focus over a wider range in the forward and backward directions (more depth of field), producing a picture with clear focus throughout the image area. Before shooting, you can use the preview function to check how the background will look in your picture. Aperture value (F-number) is decreased Aperture value (F-number) is increased 1 While holding down the mode dial lock, set the mode dial to A. 5 Mode dial Sub dial Exposure 2 Rotate the main dial or sub dial to set the aperture value. Main dial Large aperture (F-number is decreased) Main dial Sub dial Small aperture (F-number is increased) 59