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3.
Precisely adjust the mount position by means of adding/removing back focal adjustment
spacers until you find the best focusing position.
4.
Adjust the phase angle. Once you find the right phase, lock the screws (M2 metric thread).
5.3.
How to change the magnification with MTDV motion controller
Be sure to correctly load the lens XML configuration file (see sections 5.1.1 and 5.1.3
for details).
Now the four different magnifications of the TCZRS zoom lens are saved into the memory slots of
the MTDV motion controller.
Go
in the “Operation” web page of the MTDV GUI (see Figure 3) at the “Memory Save/Recall”
section. Type a number in the range of memory slots you choose when importing XML and click
“Load” button to change the magnification.
6.
CENTER POSITION REPEATABILITY
Center position repeatability is defined as the positional stability of a reference point at the same
magnification, keeping the same measurement configuration.
Choosing a reference point C
1
(X
1
;Y
1
), after n measurements at the same magnification, the
distribution of reference point positions (C
1
,C
2
,…, C
n
) has a mean C
m
(X
m
;Y
m
) that is the Center of the
repeatability area. The radius of this area is the maximum distance between the mean of the
distribution and any other reference point registered in testing.
7.
CENTER DISPLACEMENT
Every zoom system shows different image centering at different magnification settings.
Choosing a reference point at a given magnification, when magnification is changed this point
shifts. The maximum distance between reference points at different magnifications is the center
displacement. To better understand this effect, you can refer to the following picture.
To eliminate this effect, you can select a reference point at the image center when the lens is set at
its maximum magnification. Then you can measure the x and y image center displacements at the
other three magnifications.
The x and y (dx and dy) displacements must be recorded together with other calibration
parameters specific for each zoom configuration (magnification factor, residual distortion
correction parameters...)
The maximum x or y displacement will define the width and height of a crop-window which will
show the image center always perfectly aligned.
Summary of Contents for TCZR036S
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