SPECTRA "COMBI-500" BOOKLET Product booklet

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                Meter
            500 x
            MORE
             SENSITIVE!




   PHOTO RESEARCH CORP.@        KarI Freund. President
       837 North Cahuenga Blvd., Hollywood 38, California
 PHOTOMETRY IS OUR BUSINESS  . . . NOT A SIDELI'{E

The new Spectra "Combi-500" Professional
 Exposure Meter retains every advantage of the
 famous Spectra Professional! The "Combi-500"
 combines a SELENIUM CELL and NEWLY
 DEVELOPED BATTERY OPERATED ULTRA-
 SENSITIVE SPECTRALLY RESPONSE COR.
 RECTED, PHOTO-CONDUCTIVE CELL.
 Sensitivity is 500 times that of the average
 selenium cell meter, 1O0 times more than the
 highly sensitive Spectra Professional Meter.
 Exposures are indicated for extremely low light
  levels. The two tiny, easily accessible, mercury' batteries are used in the SPECTRA "COMBI-500"
 ONLY WITH THE ULTRA-SENSITIVE RANGE,
 NOT FOR NORMAL CONDITIONS WHICH
 COMPRISE MOST EXPOSURE SITUATIONS.

 Simple Conversion to
 "Combi-5OO" Operation

 The professional photographer who purchases
 the new "Combi-500" .   . or has his Spectra
 Professional Exposure Meter converted to
 "Combi-500" will experience no operational
 problems. His experience and the information
  in this folder and in the Spectra Professional
 Exposure Meter manual will enable the
 professional photographer to consistently
 determine accurate settings for both normal
 and extremely low light level
 ohotogra ph ic situations.
                       www.butkus.us                                                                                       **
                                                                ,j

NEW SPECTFiA'
PHOTOSHIELD
Protect Your Photospherel
The new Spectra Photoshield protects the
Photosphere of your Professional Exposure
Meter against damage. lt helps eliminate incon-
venient, costly meter "down time" and
photosphere repairs. The Photoshield removes
and snaps securely on in a split second,
is made of strong, light weight metal and
comes in attractive, dull meter-matching black.
See your Photo Dealer or write direct to Photo
Research Corp., 837 No. Cahuenga Blvd.,
Hollywood 38, California.

HOW TO USE
 TH E SPECTF-A' "COM BI-5OO''
  When you find no indicated reading on the
   standard selenium cell, press red booster button
    for low, ultra sensitive range. lf pointer goes
   beyond 250 insert low range multiplying slide
   marked with "Red" X and use corresponding
   "Red" X on computer -  for calculating proper   exposure. Additional reference points as
    indicated below-(red band on computer).
S READ SHUTTER SPEED DIAL IN SEcoNDS
o SPHERE REMOVED SPEED DrAL rN SECONDS
X  is used with MULTIPLYING SLIDE MARKED WITH RED
   "X" to EXTEND LOW RANGE to intermediate light
    levels. READ SHUTTER SPEED DIAL lN SECONDS.
   (Note: No other multiplying slide should be used with
   the low, Ultra-Sensitive Range).
X  Reference point for REFLECTED LIGHT READINGS with  PHOTOGRID. READ EXPOSURE SPEED DIAL  I.N
   SECONDS.
M READ SHUTTER SPEED DIAL IN MINUTES (X) PHOTO.
  SPHERE REMOVED. READ EXPOSURE SPEED DIAL IN
   MINUTES.





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PRESS WHITE BUTTON NEW HIGHLY SENSITIVE                            FOR BATTERY TEST
 PHOTO.CONDUCTIVE CELL                                                                                               I


 PRESS RED BUTTON
 FOR LOW
 LIGHT LEVEL
  (u ltra-sensitive)



 PUSH TO
 REMOVE
 BATTERY --i
 HOLDER




NOTE: TWO TINY
MERCU RY BAT.
TERIES OPERATE
THE NEWLY DE-
VELOPED PHOTO.
CONDUCTIVE CELL
FOR LOW RANGE
EXPOSURES ONLY
,.  . NOT FOR NOR.MAL CONDITIONS

WHEN TO REPLAGE BATTERIES
The batteries are checked by pressing the WHITE BUTTONon the top of the cell housing.  lf the pointer reads below the
bottom edge of the 64 block, the batteries should be replaced.
HO\^/ TO REPLACE BATTERIES
To Replace Batteries use coin to push battery compartment
out by pressing on slot below Red Switch Button. Replace with
Mallory RM 625R or equivalent   note Polarity markings on                                       -Battery Holder.

Instructions for Using
       Computer with Low Range

      .'"Rdd" band on outer dial is for low range reference.         . "S" is the STANDARD REFERENCE POINT.  lt is used                         \
       under most circumstances: READ SHUTTERSPEED                                                       .      DIAL lN SECONDS as marked.         . In extremely dim light the Photosphere may be re-                          f-I      moved and the RED dot to right of "S" should be
         used.         . As an added convenience when exposures of long    1                                         (minute)                                                      reference                             "M"                     necessary,                            the               are        duration
                                      shutter                                       speed        point          may                    used and                            the                                                     dial read           Nf               be        in Minutes.                                                                                                                                                                      {-i         . RED "X" to the right of "M"  is used with PHOTO'      SPHERE OFF. Read-shutter speed in Minutes.         . RED "X" is also used as a reference point to extend         {        the low range by use of MULTIPLYING SLIDE MARKED                     -.x      WITH RED "X". Read Shutter Speed Dial in Seconds,         . RED "X" is also the reference for REFLECTED LIGHT     s      READING with the PHOTOGRID. (No multiplying  is       used with Photogrid.) READ SHUTTER'SPEED  DIAL
       IN SECONDS.
       NOTE: "EV" window is NOT used with the low Ultra-
                Sensitive Range.
                                       xt2 LOW RANGE
 PHOTOSPHERE ON
 IN MINUTES       #                             LIGHT


                                 olo
               *                     LOW RANGE                                        PHOTOSPHERE
                                 ON IN
                                       SECONDS

                             LOW RANGE
                                  PHOTOSPHERE OFF
                                      IN SECONDS                              www.butkus.us
"See additionat information on page 12 of green instruction manual."