Target Speed - P+S Technik pro35 Image Converter MKII User Manual

2.3.3 Adjustment wheel for target speed:
What is the "Target"?
The target is an element out of glass inside the Image Converter, which is located at the posi-
tion of the image plane of the PRO35. Often described misleadingly as focusing screen or
ground glass, it fulfi ls a similar function in the unit. It displays the picture, which is projected
from the lens.
The equivalent depth-of-fi eld effect of 35 mm fi lm is achieved only because of the special
composition of the target surface and the physical size of the displayed picture.
Without the target glass the Image Converter would only be a 'relays lens'. The angle of view
would be displayed correctly to the camera, but the depth of fi eld would be identical to "nor-
mal" lenses for this camera.
Because of the motion of the target (motion blur) the structure of the glass surface is blurred;
but it is visible when the Image Converter is switched of. Depending on different factors (see
chart) it can be worked with lower or it must be worked with medium speed.
Low speed
Possible in case of low-resolution
cameras
Possible in case of long exposure time
Possible in case of long range lenses
Possible in case of open aperture
+ very quiet
IMPORTANT: The adequate adjustment of the target speed has to be tested BEFORE
shooting. The evaluation should be done with a high quality monitor with a resolution ana-
logue to the camera's resolution.
22
Next to the RUN LED is the adjust-
ment wheel for regulation of the
speed of the oscillating target.
Medium / high speed
Necessary in case of high-resolution
cameras
Necessary in case of shorter exposure time
Necessary in case of short range lenses
Necessary in case of dimmed or light-weak
lenses
– maybe louder operating noise