Gossen Luna-Pro User manual

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                                                    GOSSEN


      GOSSEN
         Eriangen
                                                                    Variable Angle
                                                            Attachment for
                      Sole U. S. Distributor:                             LUNA-PRO
    KLING PHOTO CORPORATION
    New York       Los Angeles
GOSSEN T. M. Reg. U S. Pat Off.     Printed in Germany

                                               2682 a





                                                 The TELE Attachment enables you to reduce the normal (30°)
                                                        measuring angle of your LUNA-PRO either to 15° or even 7.5°. The
                                                                              built-in reflex viewfinder shows you the area to be measured.

                                                 The illustration at the left shows the three measuring fields of your
                                               LUNA-PRO, viewed from the same distance. (The yellow  circle
                                                       which delineates the full 30° measuring field is, of course, not in the
                                                                   viewfinder). The following instructions assume that you are familiar
                                                                with the regular operation of the LUNA-PRO itself.

                                                 The  limitation  of the measuring angle by means  of the TELE
                                                        Attachment to either 15° or 7.5°permits a more refined measuring
                                                              technique: When using long telephoto lenses you can adapt





 view by comparing the viewfinder image of the TELE
Attachment with that of your camera viewfinder.
Selective Readings  - the smaller  measuring angles
permit the targeting of the measurement to selected
important spots within your subject.

Contrast - you can get a definite idea of the contrast
prevailing in the subject by measuring the lightest and
the darkest areas individually. Should  the  prevailing
contrast  exceed  the capabilities of the film used, the
shadow  portions may  be  lightened  by means  of
reflectors or by flash.

Mounting the Attachment
Slide the hemispheric diffuser of the LUNA-PRO

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to the right. Insert the lug (6) of the TELE Attachment
into the slot provided in the LUNA-PRO housing; the
diffuser will fit into the recess of the Attachment. Now
press the button (5) and fit  the  Attachment  entirely
on the LUNA-PRO. Releasing the button will fix the
Attachment firmly on the meter.

Angle Selector slide
The measuring angle  is selected by means of the
black slide (4). When you shift slide all the way to the
left, the measuring angle set is 15°; at the left of the
slide "15°" and a red symbol will  appear. When  the
slide   is  shifted   all  the way to the right, the 7.5°.
measuring angle is set; at the right "7.5°" and a green
symbol  will  appear-  Always make  sure  that  the
selector





 slide is shifted all the way to the left or right until  it               set a 15° reading to the red circle index, a
 clicks  into  position;  otherwise  incorrect  readings               7.5° reading to the green circle index of the
 might result.                                                          transfer scale.
                                                 The color coding facilitates correct settings:
 Measuring - proceed as you would in using your         red for 15°. green for 7.5°.
 LUNA-PRO  for  regular  reflected  light readings  -
 merely with the following modifications:                 Suggestions for selective measurements:
                                                   Which portions of a subject should you measure so that the
 1. Use the reflex viewfinderfor aiming the meter.          LUNA-PRO will indicate the "correct" exposure time - the lightest
    The area you see within the larger (red)                  or the darkest areas? The answer is: Neither! Spot readings of
       circle is being measured when the Selector             areas of average brightness - preferably a medium grey - will
      Slide is set to 15°; the smaller (green) circle              usually produce good results. Please bear  in mind that the
     corresponds to the 7.5° measuring angle.                   lightest areas may be lighter by four or more steps (i. e. at least
 2. Read the needle deflection on the indicator           16 times) than the darkest portions. Measurement
     scales of the LUNA-PRO in the usual manner
      but, instead of transferring the reading to the
      triangular index of the yellow transfer scale,





of the  brightest  portions would almost  certainly   lead   to
underexposure,  while  overexposure would result when based
on readings of only the darkest portions. Therefore, the correct
exposure lies somewhere between those two extremes;  it can
be determined by the following method: Set on the transfer
scale the middle value between the high and low light area
readings. Example: You had obtained a reading of "13" for the
darkest portion, and "17" for the lightest portion of the subject.
Use the middle value,  i.e. "15" and set  it at the appropriate
index (green orred) on the yellow transfer scale.