Light meters
Gossen Ascor Electronic Flash Meter User manual
User manual for Gossen Ascor Electronic Flash Meter. 18 pages in English. Read the original PDF, download or print a copy without registration.
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Document details
- Brand
- Gossen
- Model / document
- Gossen Ascor Electronic Flash Meter
- Document type
- User manual
- Language
- English
- Pages
- 18
- File size
- 1.0 MB
- Category
- Light meters
- Document date
- Not specified in catalog
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Page 6 · Read text
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Operatingcheck-list
1. Turn film speed setting'disk (15) to set ASA 5. Operateflash unit (see page 4)
value in window (14)
6. Read f/stop (6) at transfer scale value (5)2. Check mechanicaland electric zero positions of needle reading(2). (see page 3) Note: The indicatedf/stop always applies to
3. Briefly depress rear wing (13) of rocker a shutter speed of 1/roo- 1/r:ssec.
switch (12) to activate instrument THE INSTRUMENT SWITCHES ITSELF OFF
4. Hold or place meter in measuring position AUTOMATICALLYABOUT 3 MINUTES AFTER
(see page 4) SWITCH-ON.View original page 6Page 7 · Read text
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OperatingprinciPle
You will find the followinginformationhelpfulto The GOSSEN-Ascor Electronic Flash Meter
understand the operating principle and func- measuresthe short high-intensitylight pulses of
tioning of your GOSSEN-AscorElectronicFlash electronicflash units. lt integratesthe total light energy (lumen seconds)in the same manner asMeter. the emulsion of the film does for its exposureBLOCK DIAGRAM OF THE GOSSEN.ASCOR within the flash duration.ELECTRONIC FLASH METER Momentary pressure on the rear wing of the
rocker switch (2) sets the meter for a 3-minute
readinessperiod; however,this does not open
the circuits for actual measurement.But, within
less than a microsecond (1/rooooooSec) after the
flash starts, the silicon cell (3) in conjunction
with the transistorizedtriggering circuit (4) 'opens' the actual measuring circuit (5-6-7)
wnicn is kept active even for the longest flash
duration normally encountered in electronic
flash units. During this very short interval the
color-correctedphototransistor(5) and its tran-
sistorizedcircuit (6) integrate the light of the
) f lash and the ambient light. The resulting
2 measurementis indicated by the meter needle
(7) and remains"locked in" until the terminating
photo transistor c Silicon Battery battery the 1 disconnects (8) automatically it circuit I n t e g r a tin g circu 6 switch Rocker 2 measuring until a new - or from the'circuitry Meter 7 c e l l S i l i c o n 3 4 Electronic trigger 8 Termi nati ng (switch-off) cycle is started by again depressing the rear
(switching circuit) c i r c ui t wing of the rocker switch.View original page 7Page 8 · Read text
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Detailedoperatinginstructions
Your GOSSEN-AscorElectronic.FlashMeter is The mechanical zero setting can be checked
designed to give you consistently accurate only when the instrument is switched off (see
measurements.Please follow the various ope- ,,OperatingPrinciple").To verify the switched-
rating steps carefullyto assure correct results. off condition, turn the knurled ring (9); when
To facilitateexact reading,the meter scale has switchedoff, the needle positionshould remain
a mirror surface.Read the needle position in unchanged. lf the needle is not at the zero
which the needle covers its own reflected check-line (3), turn the zero setting screw (16)
image. on the undersideof the meter until the meter
needle is exactly on the zero setting line. The
battery need not be removedfor this test.Carefullycheckthe mechanicaland electric zero
settingsand the conditionof the batlery. Electric zero setting.
The electroniccircuitryrequiresalso an electric
Mechanicalzero setting. zero setting: The meter needle should remain
Like all precisionmeasuringinstruments,your on the check-line(3) when the instrumenthas
GOSSEN-AscorElectronicFlash Meter oermits been switchedon (by depressingthe rear wing
mechanicalzero setting of the meter needle. (13) of the rocker switch (12). lf the needle is
Normally such adjustment becomes necessary not on zero, turn the knurled ring (9) until the
only if the instrumenthas had rough handling. needle covers the zero check-line(3).View original page 8Page 9 · Read text
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Battery drec* and battery change. Film speed setting.
With normal use, the batterysuppliedwith your Turn the setting disk (7) by the raised ridges
GOSSEN-AscorElectronicFlash Meter lasts for (15) until the ASA number of your film is set
severalthousand measurements.However,it is againstthe triangularwhite marker.
advisable to check the battery condition from
time to time. For a battery test an exact mecha-
nical zero setting - as described above - is Flash measurement.
essential. The actual measurementis made in the manner
of incidentlight measurements:Point the meter
To check the battery, hold down the forward from the subject towards the camera. Naturally,
wing (11) of the rocker switch (12). The meter the proper position of light sources should be
needle should point to the battery check mark arranged before measurement.
(10). lf the needle rests to the left of the check Momentarily depress the rear wing (13) of themark, a fresh battery must be used. rocker switch (12); this switches your meter on
To replace the battery,unscrew the cover of the and holds it in readinessfor about three mi-
battery chamber (18) - a coin will be useful for nutes. A test flash will give you the meter
this. Be sure to insert the fresh battery with reading to set your f /stop for the actual
proper polarity of the * and - contacts. After exposure. When you operate your electronic
inserting a fresh battery, immediatelymake the flash equipment,the meter needle (4) is deflec-
batterytest described above. ted to one of the values on the meter scale (2).View original page 9Page 12 · Read text
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I
Needle
reading f /stop
(scale) for
(value) ASA 50
after the first flash 3 B
after the 2nd flash 4 1 1
Gumulativeflashes. after the 3rd flash 4,6 1 1 / 1 6
lf your GOSSEN-AscorElectronic Flash Meter after the 4th flash 5 1 6
indicatesthat a single flash of your electronic
flash unit requiresa larger f/stop than you need Any variationsbetween the measuredvalues of
for adequatedepth of field, you may use several the individual flash impulses which you may
- and your discern in the process of additive flashing areI successiveflashesfor a still subject meter will add up the total light from such due to the fact that electronic flash units do
flashes within the 3-minute readinesscycle of not necessarilyhave an identicallumen-second
the meterl output from flash to flash; permissibletoleran- ces - under existing ASA and DIN (German)
An additiveseries of flashes may, for example, standards- in effectivelight output range up to
producethe followingresults: + 20 % which equals t r/z f/stop.View original page 12Page 13 · Read text
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ElectronicFlashMeterSpecifications-GOSsEN-Ascor
Measuringmethod: Incidentlight measurementfrom subjectto camera;
the light falling on the subject is measured.
Light-sensitivecells: One phototransistor,silicon
One photoresistor,silicon (both cells are color-corrected)
Measuringangle: 180 degrees
Computerscales: ASA 6 to ASA 6400
f /1 ot t/90
(all scales linearwith t/s increments)
Dimensions: 4" x 2s/s" x 21/e"
Weight: 83/r oz
Battery: 15 V (TYPeIEC 10 F 15)
The above type number correspondsto:
EVEREADY504
BURGESSY 10
RAY-O-VAC220
and similar batteries.
Specilications are subject to change without notice'View original page 13Page 14 · Read text
www.orphancameras.com 'system'GOSSENLUNA-ProCdS Exposuremeter
The remarkableGOSSEN LUNA-Proand its optional attachments
page) put at your command a comptete metering Ltgq_lglt
SYSTEM.You get not only all the advantagesof its incredible
2,000,000:1 sensitivityrange for measuringin brightestsunlight,
candlelight,even moonlight;you can also convert the LUNA-Pro
instantly from a reflected-and-incidentmeter to: a variable angle 'spot' meter; photomicrographymeter; and enlargingmeter.witn
this one superb SYSTEMmeter you can master every criticat light-
measuringsituation on location,in the studio, darkroom and
laboratory wherever perfection is the criterion. See this fine
instrumentat your dealer.There is nothinglike it!
SPEGIFICATIONS: Smooth, one-hand operation MeasuresView original page 14Page 15 · Read text
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LUNA-ProoptionalAttachments
The LUNA-ProSYSTEM is uniquely universal'
Variable Angle Attachment. Instantly converts the LUNA-Pro's
normal 30o acceptance angle to 150 or even 7 l lzo. A built-in 'target'area for precise reflex viewfinder shows your critical
measuring.The narroweracceptanceangles are especiallyuseful 'spot'heasurements of smallerareasand for the determination for
of contrastratioswithin a given scene.
Enlarging Attachment. There is little tolerance f o r error in
enlargingexposures,but the LUNA-Prowith the EnlargingAttach-
ment-makesa reliableand accurateenlargingmeter to help you
save time and enlarging paper. Placed on your enlargingeasel,
it measuresa smatl area of the projectedimage;a light conductor
transmitsthe measuringarea to the highly sensitiveCdS cell of
the LUNA-Pro.
MicroscopeAttac-lrment.Accurate, dependablephotomicrographic
exposuremeasurementsare easilyand instantlyobtainedwith the
LUNA-Pro and the microscopeattachment,either in the ocular
tube or over the eyepieceof the microscope.View original page 15Page 16 · Read text
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GOSSEN-Sixticolor
Color TemperatureMeter and Filter Indicator
Eliminatescostlytrial exposuresand "off-color"
results.At a glance, this compact instrument
shows the color temperatureof the light source
(2 600 to 20 000 oK) and, simultaneously,indi-
cates the correction filter required for correct
color balance with any type of color film. The
Gossen SIXTICOLORis an important aid for
everyuser of color film in still or motion picture
photography.
Ask your dealerfor a demonstration!
1 1View original page 16Page 17 · Read text
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SERVICE
The GOSSEN-AscorElectronic Flash Meter is guaranteed to the
original registeredowner as shown on the guaranteecertificate
suppliedwith each new meter.
lf repair or adjustment should become necessary, send the
instrument (directly or through an authorized dealer) carefully
packed,prepaid and accompaniedby the original guaranteecard
to:
Gossen Service Department
Photo Tech. lnc.
78 East 13th Street
New York, N.Y. 10003
A brief descriptionof the reason for sending the meter should
accompanythe package.
M a n u f a c t u r e r
GOSSEN GMBH
Erlangen - West Germany
12View original page 17From the M. Butkus archive. Original publisher and archive notices are retained.
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PDF verified 2026-10-10.