Post on 04-Jan-2016
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LIGHT AND DARK
LIGHT AND DARK
We have yet to devise and kind of technology that can
perform the type of sophisticated color adaptation that your
eyes pull off.
Think about how fast your eyes focus on something near
or far away.
Now think about how long it can take for your camera to
focus on an object near or far away.
BIG DIFFERENCE
LIGHT AND DARK
Understanding the difference
between what your eyes can see and
what your camera can capture, is an
essential step for taking better
pictures.
LIGHT AND DARK
Most significant difference is the range of
brightness that your eye can perceive.
Your eye does this by opening and closing it’s iris,
or pupil to limit the amount of light that strikes the
retina.
DYNAMIC RANGE
DEFENITION: The measure of the darkest to
lightest tones that can be captured by a device.
Your eye can see dark moonless nights, to harsh
glaring suns.
If you put it into a ratio, the brightest thing you
can perceive is about a BILLION times brighter than
the darkest thing.
MEASURING LIGHT
Different ways to measure light.
Every time an amount of light in a scene doubles,
photographers say that the scene has brightened by one
stop, or f-stop.
If you cut the amount of light in the scene in half, it has
darkened by one f-stop.
EVERY DOUBLING OR HALVING OF LIGHT IS
MEASURED AS ONE STOP.
F - STOP
The human eye can perceive a total dynamic range
of about 30 stops.
While looking at a single scene, the eye can
discern a dynamic range of about 15 f stops, the
darkest thing and the brightest thing can be about
15 f stops apart.
A camera has a range of 10 – 12 f stops, you
expect to capture a range of 5 – 9 f stops.