Blendux meter User manual

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    BIHrDUX
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BltilDUX   is a perfect Exposure Meter lor all Amateur cinematograph purposes, for day-  .
                   ligt as well as artillcal light.
BLtilDUX  is very simple to use and being self-contained, no battery is necessary and no
              adjustments have to be made.  lt tells you at a glance the correct flvalue at
            which to set your lens, it being only necessary to direct the lens of the
               'Blendux' to the scene lo be fllmed.
BltilDUX   is free from errors, such as occur with optical extinction exposure meters due
               to fatigue of the eye, or glere,
BlttDUX   has two scales and accordingty a clear and wide measurlng range, the compa-
                ratively small picture-angle used in Amateur Cine Cameras having been taken
               into consideration.
Bl-ttDUX  is.the tatest achievement in electrical science.

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  Description of the Blendux.    How does Blendux work ?
   The photo electric exposure meter consists
of a high-grade moving coil measuring inslru-     The light ref lected, from a scene is collected
ment, the front of the Bakelite case carrying  through the front lens of the Blendux and
a lens behind which the photocell is fixed.  through a diaphragm and thrown on to theThis novel photo-cell will, without connectionto any outside current circuit, when exposed  photocell. The photocell produces, according
to ligth, generate a photo current, which waxes  to the intensity of the light a stronger or weaker
stronger as the degree of illumination increases.   current, which is sufficient enough to move theThe Blendux thus requires no additional source                                               pointer of the very delicate measuring instru-of current. The Blendux can be relied upon
to be always ready for service at a moments  ment contained in the Blendux
notice.                                  The produced current is proportional to   The scale of Blendux is calibrated to indi-                                              the intensity of the ligt falling on to the photo-cate direct, f/values setting for Cine-Cameralenses, the shutter speed being r/rrnd of a second  cell and it is therefore possible to exactly      'theas  rnin     case of -Fiilmo 70, 70 D. etc., Victor,  measure the light intensity.
Auto-Kinecam, Cine-,,Kodak", Cine-Nizo, Sie-
mens Halske, etc., etc.
                                                                                                                                      Digitally                                                                                                                     signed                                                                                                               by mike butkus   In case of working with artificial light or                                                                                                    DN: cn=mike                                                                                                                                 butkus,                        made        days,            measurements                          areon dull                                                                                                        o=orphancameras,                                                                                                                         ou=29,                                             with mike butkus           range,                              red knob.                                                                                                             email=mike@butkus.org,    closer              by pressing                          thethe
In this case the sensitiveness of the Blendux                                        Date: 2020.04.19 23:20:50c=US-04'00'
is increased 40times and the red numbers on
the scale are made use of. With more brilliantlight, such as prevails in the open country,
of when exposing against the light, the close
range should be dispensed with.

www.butkus.us                                            opening when aiming at the scene, an erroneous       Directions for use.                                                indication of the f/value will result, The lid
     l) Cet your camera ready before taking  of the leather case of the Blendux must be
the light measurement.                   swung quite clear and the fingers of the ope-
    2) Direct the lens of the Blendux at the  rator must not touch the front lens when
middle of the scene to be taken.  lf the pointer  taking a reading.
does not move due to the light being dull,    The scale of the Blendux is calibrated
then press the red knob and take the fivalue  for direct readings for cameras operating at
reading from the red scale                   l6 frames per second (Shutter opening 1800)
    3) Take a short measurement before every and using standard films as shown in table
new picture. This is very important as the  (a) having a sensitiveness of 2A-21o Scheiner.
light intensity very of en is changing rapidly.   If using films of 180 Scheiner as shown in
                                            table (c) take the reading preceding the indi-    4) The picture angle covered by Blendux  is
vertical at 450 and horizontal at 7r,0. This is  cation of the pointer. If using films of higher                                                       sensitivity, take the next higher reading follo-to be taken into consideration  if the camera                                     wing the indication of the pointer of the in-moves over a greater picrure angle, to cover                                                 strument.the greater angle or in a very long Panorama
shot. Two opposite readings should he laken,    The indications of the Blendux are under
and the mean value considered. In case the  all circumstances to be relied upon.
camera moves from a bright sky to a dull
landscape then the mean value must be made
use of.
   Direct sunlight wilt do no harm to the
photocell, but if it is allowed to enter the lens

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   [)ircct tlre Blendux at tlrr siiir of tirr ciulrefu tou:tr.ds tiic fcenc to be tilkcn.