Gossen Luna-Pro microscope attachment User manual

The Attochment utilizes the supreme meosuring
sensitivity of your LUNA-PRO for convenient
ond relioble exposure meosurement when toking
microphotog ro phs.
(The following instructions ossume thot you ore
fomilior with the normol operotion of the LUNA-
PRO exposure meter).

To Attoch
slide the hemispheric diffuser of the LUNA-PRO
to the right edge of the circulor window.
Insert the lug (3) of the Attochment in the spoce
between the diffuser ond the edge of the diffuser
chonnel. (The diffuser fits into o recess of the
Attochment). While holding down the locking
knob (2) of the Attochment, ploce the Attochment

flush with the  f ront of the LUNA-PRO. When you
releose the locking knob, the Attochment  is
fixed in position.
Operotion
The LUNA-PRO with the locked-on Attochment
moy be used of vorious spots of photomicro-
grophic equipment: ln the oculor tube (ofter
removol of the oculor); obove the oculor
(monoculor or binoculor type); ot the focusing
ocu lo r.
For the meosurement which moy be considered
o modified "reflected light" meosurement, the
                                          in theLUNA-PRO scoles ore used initiolly -normol monner, i. e. the ASA setting is mode,
the ronge selector is pressed forword or bock-
word to obtoin normol or high sensitivity ronge,

www.butkus.us
ond the locked-in needle def lection volue is
tronsferred to the triongulor yellow index on the
lower "tronsfer" scole.
The exposure time (shutter speed) is reod of o
certoin f-stop which, however, is NOT on f-stop
                                            oin the usuol sense but serves here os
colibrqtion volue thot is determined in the follo-
wing monner:
Colibrotion
Without moking on exposure meosurement, toke
o number of test exposures of on "overoge" not
                                      speedstoo extreme object - of vorious shutter(exomple: 1/60, 1/30, 1/15, 1/8, 1/4, 1/2, 1
second) ond ofter development select the
best exposure.
Then, using the some object under identicol

conditions (mognificotion, lighting, etc), moke o
meosu rement with the LUNA-PRO ond Attoch-
ment ploced ot the position which will be
convenient for oll further meosurements. (See
"Operotion" obove, first porogroph).
Use the LUNA-PRO scoles: Set the locked-in
meosured reoding (exomple: needle def lection
"14") to the triongulor yellow index on the
tronsfer scole.
Now, reod the "f-stop" opposite the previously
determined best exposure time; Ior exomple,
ossume thot it wos 1/4 second ond thot the
opposing f-stop is f/5.5. This "5.6" is the Colib-
rotion Volue for oll future meosurements: Simply
use whotever exposure time oppeors opposite
5.6 !        _.

www.butkus.uslf you chonge the method of meosurement
(obove oculor insteod of in the oculor tube, lor
instonce) or if you chonge illuminotion, you
noturolly must estoblish o new colibrotion volue.

OSSEs
            Erlangen

            Sole U. S. Distributor:
    KLING PHOTO COMPANY
     New York         Los Angeles
GOSSEN T. M. Reg. U S. Pat Off.

                                       Printed in Germany
                                                107226 a