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has been removed, Is directly fitted to the microscope eyepiece by
means of these connecting rings and extension tubes.
For prefe-
rence, focussing ·is done on a virtual Image.
For this type of
work. the built-in photocell proves a tremendous advantage for, as
in all other cases, all that has to be done Is to bring the viewfinder
needle opposite its mark by acting, on the one hand, on filming
speed
and,
on the other, on the microscope's light source.
3° Single-frame
filming
Frame-by-frame filming Is essential if one wishes to shoot animated
cartoon or puppet scenes, and also to record slow-development
phenomena. This type of filming cannot be .effected otherwise than
on a
tripod,
in "Manuel" position, using a flexible cable release
(power switch In the continuous position "O")
(39).
'Under these conditions, frame-exposure times are a follows:
2 fps
=
1/7
sec.
25 fps
=
1/87 sec.
4 fps
=
1/15 sec.
36 fps
=
1/87 sec.
8 fps
=
1/30
sec.
50 fps
=
1/87 sec.
18 fps
=
1/65 sec.
70 fps
=
1/87 sec.
(with the shutter
half-open:
divide the above exposure times by
two: example: 1/130 sec. at 18 fps).
Caution. - Never lock the flexible cable release In the "continuous"
position for single-frame filming.
Pressure time on the cable
release should be as short as poestble.,
39
1
27
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