Nikon FA Film Camera FA User Manual download pdf (Page 69)

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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Nikon FA Film Camera FA User Manual Page 69

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