Nikon Nikon Nikomat FT, Nikon FA manual EV Range of the Camera, What is EV?, EV Chart

EV RANGE OF THE CAMERA

What is EV?

Exposure value (EV) is a number representing the available combinations of shutter speed and aperture that give the same exposure effect when the scene brightness and ASA/ISO remain the same.

At ASA/ISO 100, the combination of a one-second shutter speed and an aperture of f/1 4 is defined as EV 1. If the aperture is stopped down by one full f/stop or the shutter' speed is one step faster. the EV increases by one; if the aperture is opened up by one full f/stop or the shutter speed is one step slower, EV decreases by one Using ASA/ISO 100 as an example, 1 sec. at f/2 represents EV 2,1 sec. at f/5.6 represents EV 5, while 1/125sec. at f/5.6 represents EV 12. As the exposure is the same.1/30sec. at f/11 and 1/1000sec. at f/2 are also EV 12.

EV Chart

The Nikon FA's meter can only be used within the meter's EV range. The chart shows the relationship between the shutter speed, f/stop, and film speed Careful attention to this chart will assure precise exposure, automatically, over the entire usable range of the FA Depending on film speed, EV range determines the following: in the P mode, the usable combinations of aperture and shutter speed, in the S mode, the usable apertures to match the shutter speed set on the dial: and in the A mode, the possible shutter speeds to match the aperture set on the lens. With ASA/ISO 100 film and a 50mm f/1 4 lens, the usable EV range is 1 to 20 As you can see from the chart, any shutter speed from 1 to 1/4000sec. can be used within this range However, when using ASA/ISO 200 film, the EV range is reduced to 2 to 20, whereas with ASA/ISO 400 film, it becomes 3 to 20. Therefore, with ASA/ISO 200 film, the slowest usable shutter speed is 1/2sec., whereas 1/4sec. is the slowest speed usable with ASA/ISO 400 film. This information is reflected in the LCD inside the camera's viewfinder. For example, with ASA/ISO 200, if you set the mode selector to P or A,1 will never appear, but as the light gets dim, Lo appears immediately after 2 Likewise, with ASA/ISO 200 in the S mode, if you set 1 sec. on the shutter speed dial, 1 will not appear, but in its place either a faster shutter speed is displayed (if the shutter speed is shifted to a higher one when the scene is bright) or Lo appears (when the scene is too dark). With ASA/ISO 400 film, 1 and 2 never appear, indicating that 1 and 112sec. are unusable shutter speeds.

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