LEFT TOOL AREA AND HARDWARE CONTROL TOOLS
LSM 710 and LSM 780
Carl Zeiss
Acquisition Tab
Systems
80 M60-1-0025
e
02/2010
•
The slider next to
Pinhole
enables you to change the pinhole diameter of the relevant channel.
−
The pinhole diameter is indicated in
µm
,
Optical Slice
and
Airy Units
. The Airy value depends on
the aperture of the objective, excitations and the emission wavelength.
−
A small pinhole diameter will increase the depth of focus, but reduce the light intensity received by
the detector.
−
When you vary the
Pinhole
diameter, an Optical Slice value is displayed. For optimum depth
resolution, Airy values should be small (for reflection 0.3), but in fluorescence applications not
below 1.0 to keep the intensity loss within a reasonable limit.
−
A click on the
1 AU
button sets the pinhole to a diameter of 1 Airy unit. A click on the
Max
button
sets the pinhole diameter to the maximum.
−
Sampling mode
: conventional oversampling readout of the detectors, accumulation over pixel
dwell time, full bit depth.
−
Counting mode
: short and very sensitive acquisition mode to count single photons events and to
provide photon statistics; reduced bith depth can occur at short pixel dwell times.
•
The sliders (and the relevant arrow buttons) next to
Gain (Master)
,
Digital Offset
and
Digital Gain
enable you to set the detector of the selected channel during continuous scanning.
−
Gain (Master): Setting of the high voltage of the PMT photomultiplier - setting of image contrast
and brightness (values available between 0 and 1200; with GaAsP detectors, the scaling of the
master gain slider is 500-1000, or 0 for off.)
−
Digital Offset: Setting of the electronic offset - background of the image can be set (values
available between -2 and 0.1)
−
Digital Gain: Amplification factor (values available between 0,3 and 15)
When using 12 bit grey resolution, gaps can occur in the histogram of the acquired image, in case the
gain slider is moved beyond a gain level of 25.
Use the Digital Offset slider to remove underexposed pixels in the image background (no blue pixels
visible with
Range Indicator
lookup table).
In case the
Camera
has been chosen for imaging the exposure time is set in the
Channels
tool.