Leica DM R Serie Mode D'emploi page 110

TV cameras with bayonet mount
Cameras with the standard Sony bayonet mount
can also be connected to all phototubes, the
Leica DM RD photomicroscope and the Vario-
tube 28 VPE. A/B-mount adapter 0.55x and a
Vario B/C-mount adapter 0.55x – 1.1x are
available for this purpose. The recorded field
sizes can be seen in the table.
Calculation of the magnification on the monitor
For all FSA tubes the magnification on the
monitor can be calculated with the following
formula:
V = objective magnification x tube factor x TV-
TV
adapter magnification x –––––––––––––––––––––
If using the magnification changer or the Leica
DM RD HC photomicroscope the above formula
must also be multiplied by the factor of the
magnification changer or zoom.
Possible errors
Picture too dim (noisy TV picture, poor contrast)
Remedy: Increase lamp intensity, swing filter out
of light path, switch over beamsplitter in tube
system, switch TV camera to higher sensitivity.
Picture too bright (TV picture glare)
Remedy: Switch neutral density filter, switch
over beamsplitter in tube system, reduce
camera sensitivity.
Picture area too small
Remedy: Use a TV adapter with a smaller factor.
110
monitor diameter
chip diameter of camera
Incorrect colour rendering
Remedy: Vary illumination intensity, carry out
white balance for TV camera according to
manufacturer's instructions, use a conversion
filter, e.g. CB 12.
Disturbed p icture frame
Remedy: Earth the microscope, Variotube and
camera. Avoid parallel laying of mains and
signal cables; connect camera and microscope
to the same mains phase (socket).
Picture sp oilt by inhomogeneous glare and/or
sp ots. Lamp s or windows are reflected in through
the eyep ieces.
Remedy: Switch over the beamsplitter or cover
eyepieces or remove the disturbing light source.
Dirt particles in the light path, lamphousing not
centered (TV systems are generally more sensi-
tive to inhomogeneous illumination).