Cokin Z121L Manual De Usuario
′ More technical Info
The difficult aspect to understand in photography is that shutter speed and aperture are fully related
(dependant) one from the other. More precisely, if you change the shutter speed, you automatically and
necessarily modify the aperture. This is where ND filters come in.
(dependant) one from the other. More precisely, if you change the shutter speed, you automatically and
necessarily modify the aperture. This is where ND filters come in.
The continuous line indicates a constant exposure value. As you can see, many different aperture-shutter
speed combinations are possible. ND filter allows to reduce shutter speed (exposure value) as per the
red continuous line.
speed combinations are possible. ND filter allows to reduce shutter speed (exposure value) as per the
red continuous line.
Example:
For aperture
For aperture
a
ND will allow you to reduce speed (from
z
to
y
)
For speed
x
ND will allow you to widen the aperture (from
c
to
b
)
Speed
z
Aperture
c
Aperture
b
c
b
a
x
y
z
For aperture
a
For speed
x
Speed
y
Without ND
With ND