End-to-End Testing for Neutrality – Vectorscope Testing ... · PDF fileEnd-to-End...
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End-to-End Testing for Neutrality – Vectorscope Testing Rhodium FSND Testing Camera rental facilities do not have access to a spectrophotometer nor the time it takes to determine an ND’s level of neutrality. A quick and easy way to determine a filter’s neutrality is by testing the sample on the very cameras on which the filters will be used. The output of the camera can be piped out to a “Vectorscope.” “Vectorscope” testing is very effective because it is a test of the image through the filter→lens→sensor→electronics→monitor. This method is beer known as: End-to-End testing. Here is an example of a vectorscope display: There are 6 sectors of the 360 degree display, each one representing either a primary or secondary color. Below is an image showing the colors:
Transcript of End-to-End Testing for Neutrality – Vectorscope Testing ... · PDF fileEnd-to-End...
End-to-End Testing for Neutrality – Vectorscope Testing
Rhodium FSND Testing
Camera rental facilities do not have access to a spectrophotometer nor the time
it takes to determine an ND’s level of neutrality.
A quick and easy way to determine a filter’s neutrality is by testing the sample
on the very cameras on which the filters will be used. The output of the camera
can be piped out to a “Vectorscope.”
“Vectorscope” testing is very effective because it is a test of the image through
the filter→lens→sensor→electronics→monitor. This method is be*er known as:
End-to-End testing.
Here is an example of a vectorscope display:
There are 6 sectors of the 360 degree
display, each one representing either a primary or secondary color. Below is an
image showing the colors:
The camera is focused on an optical target that represents a neutral gray.
With no filter in front of the lens, the vectorscope will display a burst in the
center of the display – the center is considered perfectly neutral as it represents
an equal response from all 6 colors.
With a filter in front of the lens, the center burst should remain in the center.
A shift into any of the six sectors indicates a color shift of that sector.
Note: The relationship between the magnitude of the shift and whether that
shift would actually be noticed in a real image on camera, is difficult to quantify.
However, as empirically tested, if the vectorscope is set for 5X (times five)
range, a small shift (nudge) of the center burst within the square boundary can
be considered a fine neutral where the color shift will not be noticeable.
RHOdium FSND Test Results
Arri Alexa SX - 5600K
NO FILTER
RHODIUM FSND.3
RHODIUM FSND .6
RHODIUM FSND .9
RHODIUM FSND 1.2
RHODIUM FSND 1.5
RHODIUM FSND 1.8
RHODIUM FSND 2.1
RHODIUM FSND 2.4
RHODIUM FSND 2.7
RHODIUM FSND 3.0
RHOdium FSND Test Results
Red Helium - 5600K
No Filter
RHODIUM FSND.3
RHODIUM FSND .6
RHODIUM FSND .9
RHODIUM FSND 1.2
RHODIUM FSND 1.5
RHODIUM FSND 1.8
RHODIUM FSND 2.1
RHODIUM FSND 2.4
RHODIUM FSND 2.7
RHODIUM FSND 3.0
