As promised we are presenting a terrific 'fly-by',
i.e. a microscopic flight centering around a water bear in the
dry state, a so-called water bear 'tun'.
The experimental procedure is a little bit more complicated than with
our usual photomicrographs.
Junior scientists, please listen! Do not hesitate to ask for your parents
permission before starting with major
improvements on their scientific Zeiss microscope.
Experimental set-up for the microscopic
'fly-by' video clip:
microscope #2 (right) is looking at the tardigrade on the turntable
of instrument #1 (left)
The water bear tun is positioned on the cylindrical support.
The only function of this support is to provide a little
bit more space for microscope #2 which has to come very close.
A simple torch illumination has been used in this case. The object had
to be cleanly centered in the middle of the table
otherwise it would have moved out of the image range during object rotation.
Be wise and reserve some really quiet minutes for this adjustment work.
Afterwards a series of 72 still images is taken. After each photograph
the table is rotated for 5 degrees. Care must be taken that the
camera uses a fixed exposure time and a fixed white balance. Otherwise you
will end up with a flickering video.
The still images can be combined to a video clip by free software
or shareware like "Dave's targa animator" or "bmp2avi".
You will be astonished by the visual depth and by the reflective properties
of the clip when being compared to the stills.
Video clip: tardigrade in dry state (so-called 'tun')
clinging to a moss plant.
Photographed in air.
Length ca. 0.15 mm.
File size 0.56 MB.
achromatic 10x/0.30 by the Meopta company.
© Text, images and video clips by
Martin Mach (email@example.com).
Water Bear web base is a licensed and revised version of
the German language monthly magazine Bärtierchen-Journal .
Style and grammar amendments by native speakers are warmly welcomed.